CVE-2021-34703 : A vulnerability in the Link Layer Discovery Protocol (LLDP) message parser of Ci

A vulnerability in the Link Layer Discovery Protocol (LLDP) message parser of Cisco IOS Software and Cisco IOS XE Software could allow an attacker to trigger a reload of an affected device, resulting in a denial of service (DoS) condition. This vulnerability is due to improper initialization of a buffer. An attacker could exploit this vulnerability via any of the following methods: An authenticated, remote attacker could access the LLDP neighbor table via either the CLI or SNMP while the device is in a specific state. An unauthenticated, adjacent attacker could corrupt the LLDP neighbor table by injecting specific LLDP frames into the network and then waiting for an administrator of the device or a network management system (NMS) managing the device to retrieve the LLDP neighbor table of the device via either the CLI or SNMP. An authenticated, adjacent attacker with SNMP read-only credentials or low privileges on the device CLI could corrupt the LLDP neighbor table by injecting specific LLDP frames into the network and then accessing the LLDP neighbor table via either the CLI or SNMP. A successful exploit could allow the attacker to cause the affected device to crash, resulting in a reload of the device.

Published 2021-09-23 03:15:17

Updated 2023-05-22 18:57:25

Source Cisco Systems, Inc.

View at NVD, CVE.org

Vulnerability category: Denial of service

Products affected by CVE-2021-34703

Cisco » IOS
Versions up to, including, (<=) 16.12.3
cpe:2.3:o:cisco:ios:*:*:*:*:*:*:*:*
Matching versions
When used together with: Cisco » 1000 Integrated Services Router » Version: N/A
When used together with: Cisco » 1100-4g/6g Integrated Services Router » Version: N/A
When used together with: Cisco » 1100-4p Integrated Services Router » Version: N/A
When used together with: Cisco » 1100-8p Integrated Services Router » Version: N/A
When used together with: Cisco » 1100 Integrated Services Router » Version: N/A
When used together with: Cisco » 1101-4p Integrated Services Router » Version: N/A
When used together with: Cisco » 1101 Integrated Services Router » Version: N/A
When used together with: Cisco » 1109-2p Integrated Services Router » Version: N/A
When used together with: Cisco » 1109-4p Integrated Services Router » Version: N/A
When used together with: Cisco » 1109 Integrated Services Router » Version: N/A
When used together with: Cisco » 1111x-8p Integrated Services Router » Version: N/A
When used together with: Cisco » 1111x Integrated Services Router » Version: N/A
When used together with: Cisco » 111x Integrated Services Router » Version: N/A
When used together with: Cisco » 1120 Integrated Services Router » Version: N/A
When used together with: Cisco » 1160 Integrated Services Router » Version: N/A
When used together with: Cisco » 4000 Integrated Services Router » Version: N/A
When used together with: Cisco » 4221 Integrated Services Router » Version: N/A
When used together with: Cisco » 4321 Integrated Services Router » Version: N/A
When used together with: Cisco » 4331 Integrated Services Router » Version: N/A
When used together with: Cisco » 4351 Integrated Services Router » Version: N/A
When used together with: Cisco » 4431 Integrated Services Router » Version: N/A
When used together with: Cisco » 4451-x Integrated Services Router » Version: N/A
When used together with: Cisco » 4451 Integrated Services Router » Version: N/A
When used together with: Cisco » 4461 Integrated Services Router » Version: N/A
When used together with: Cisco » Catalyst 3650-12x48fd-e » Version: N/A
When used together with: Cisco » Catalyst 3650-12x48fd-l » Version: N/A
When used together with: Cisco » Catalyst 3650-12x48fd-s » Version: N/A
When used together with: Cisco » Catalyst 3650-12x48uq » Version: N/A
When used together with: Cisco » Catalyst 3650-12x48uq-e » Version: N/A
When used together with: Cisco » Catalyst 3650-12x48uq-l » Version: N/A
When used together with: Cisco » Catalyst 3650-12x48uq-s » Version: N/A
When used together with: Cisco » Catalyst 3650-12x48ur » Version: N/A
When used together with: Cisco » Catalyst 3650-12x48ur-e » Version: N/A
When used together with: Cisco » Catalyst 3650-12x48ur-l » Version: N/A
When used together with: Cisco » Catalyst 3650-12x48ur-s » Version: N/A
When used together with: Cisco » Catalyst 3650-12x48uz » Version: N/A
When used together with: Cisco » Catalyst 3650-12x48uz-e » Version: N/A
When used together with: Cisco » Catalyst 3650-12x48uz-l » Version: N/A
When used together with: Cisco » Catalyst 3650-12x48uz-s » Version: N/A
When used together with: Cisco » Catalyst 3650-24pd » Version: N/A
When used together with: Cisco » Catalyst 3650-24pd-e » Version: N/A
When used together with: Cisco » Catalyst 3650-24pd-l » Version: N/A
When used together with: Cisco » Catalyst 3650-24pd-s » Version: N/A
When used together with: Cisco » Catalyst 3650-24pdm » Version: N/A
When used together with: Cisco » Catalyst 3650-24pdm-e » Version: N/A
When used together with: Cisco » Catalyst 3650-24pdm-l » Version: N/A
When used together with: Cisco » Catalyst 3650-24pdm-s » Version: N/A
When used together with: Cisco » Catalyst 3650-24ps-e » Version: N/A
When used together with: Cisco » Catalyst 3650-24ps-l » Version: N/A
When used together with: Cisco » Catalyst 3650-24ps-s » Version: N/A
When used together with: Cisco » Catalyst 3650-24td-e » Version: N/A
When used together with: Cisco » Catalyst 3650-24td-l » Version: N/A
When used together with: Cisco » Catalyst 3650-24td-s » Version: N/A
When used together with: Cisco » Catalyst 3650-24ts-e » Version: N/A
When used together with: Cisco » Catalyst 3650-24ts-l » Version: N/A
When used together with: Cisco » Catalyst 3650-24ts-s » Version: N/A
When used together with: Cisco » Catalyst 3650-48fd-e » Version: N/A
When used together with: Cisco » Catalyst 3650-48fd-l » Version: N/A
When used together with: Cisco » Catalyst 3650-48fd-s » Version: N/A
When used together with: Cisco » Catalyst 3650-48fq » Version: N/A
When used together with: Cisco » Catalyst 3650-48fq-e » Version: N/A
When used together with: Cisco » Catalyst 3650-48fq-l » Version: N/A
When used together with: Cisco » Catalyst 3650-48fq-s » Version: N/A
When used together with: Cisco » Catalyst 3650-48fqm » Version: N/A
When used together with: Cisco » Catalyst 3650-48fqm-e » Version: N/A
When used together with: Cisco » Catalyst 3650-48fqm-l » Version: N/A
When used together with: Cisco » Catalyst 3650-48fqm-s » Version: N/A
When used together with: Cisco » Catalyst 3650-48fs-e » Version: N/A
When used together with: Cisco » Catalyst 3650-48fs-l » Version: N/A
When used together with: Cisco » Catalyst 3650-48fs-s » Version: N/A
When used together with: Cisco » Catalyst 3650-48pd-e » Version: N/A
When used together with: Cisco » Catalyst 3650-48pd-l » Version: N/A
When used together with: Cisco » Catalyst 3650-48pd-s » Version: N/A
When used together with: Cisco » Catalyst 3650-48pq-e » Version: N/A
When used together with: Cisco » Catalyst 3650-48pq-l » Version: N/A
When used together with: Cisco » Catalyst 3650-48pq-s » Version: N/A
When used together with: Cisco » Catalyst 3650-48ps-e » Version: N/A
When used together with: Cisco » Catalyst 3650-48ps-l » Version: N/A
When used together with: Cisco » Catalyst 3650-48ps-s » Version: N/A
When used together with: Cisco » Catalyst 3650-48td-e » Version: N/A
When used together with: Cisco » Catalyst 3650-48td-l » Version: N/A
When used together with: Cisco » Catalyst 3650-48td-s » Version: N/A
When used together with: Cisco » Catalyst 3650-48tq-e » Version: N/A
When used together with: Cisco » Catalyst 3650-48tq-l » Version: N/A
When used together with: Cisco » Catalyst 3650-48tq-s » Version: N/A
When used together with: Cisco » Catalyst 3650-48ts-e » Version: N/A
When used together with: Cisco » Catalyst 3650-48ts-l » Version: N/A
When used together with: Cisco » Catalyst 3650-48ts-s » Version: N/A
When used together with: Cisco » Catalyst 3650-8x24pd-e » Version: N/A
When used together with: Cisco » Catalyst 3650-8x24pd-l » Version: N/A
When used together with: Cisco » Catalyst 3650-8x24pd-s » Version: N/A
When used together with: Cisco » Catalyst 3650-8x24uq » Version: N/A
When used together with: Cisco » Catalyst 3650-8x24uq-e » Version: N/A
When used together with: Cisco » Catalyst 3650-8x24uq-l » Version: N/A
When used together with: Cisco » Catalyst 3650-8x24uq-s » Version: N/A
When used together with: Cisco » Catalyst 3850 » Version: N/A
When used together with: Cisco » Catalyst 3850-12s-e » Version: N/A
When used together with: Cisco » Catalyst 3850-12s-s » Version: N/A
When used together with: Cisco » Catalyst 3850-12x48u » Version: N/A
When used together with: Cisco » Catalyst 3850-12xs-e » Version: N/A
When used together with: Cisco » Catalyst 3850-12xs-s » Version: N/A
When used together with: Cisco » Catalyst 3850-16xs-e » Version: N/A
When used together with: Cisco » Catalyst 3850-16xs-s » Version: N/A
When used together with: Cisco » Catalyst 3850-24p-e » Version: N/A
When used together with: Cisco » Catalyst 3850-24p-l » Version: N/A
When used together with: Cisco » Catalyst 3850-24p-s » Version: N/A
When used together with: Cisco » Catalyst 3850-24pw-s » Version: N/A
When used together with: Cisco » Catalyst 3850-24s-e » Version: N/A
When used together with: Cisco » Catalyst 3850-24s-s » Version: N/A
When used together with: Cisco » Catalyst 3850-24t-e » Version: N/A
When used together with: Cisco » Catalyst 3850-24t-l » Version: N/A
When used together with: Cisco » Catalyst 3850-24t-s » Version: N/A
When used together with: Cisco » Catalyst 3850-24u » Version: N/A
When used together with: Cisco » Catalyst 3850-24u-e » Version: N/A
When used together with: Cisco » Catalyst 3850-24u-l » Version: N/A
When used together with: Cisco » Catalyst 3850-24u-s » Version: N/A
When used together with: Cisco » Catalyst 3850-24xs » Version: N/A
When used together with: Cisco » Catalyst 3850-24xs-e » Version: N/A
When used together with: Cisco » Catalyst 3850-24xs-s » Version: N/A
When used together with: Cisco » Catalyst 3850-24xu » Version: N/A
When used together with: Cisco » Catalyst 3850-24xu-e » Version: N/A
When used together with: Cisco » Catalyst 3850-24xu-l » Version: N/A
When used together with: Cisco » Catalyst 3850-24xu-s » Version: N/A
When used together with: Cisco » Catalyst 3850-32xs-e » Version: N/A
When used together with: Cisco » Catalyst 3850-32xs-s » Version: N/A
When used together with: Cisco » Catalyst 3850-48f-e » Version: N/A
When used together with: Cisco » Catalyst 3850-48f-l » Version: N/A
When used together with: Cisco » Catalyst 3850-48f-s » Version: N/A
When used together with: Cisco » Catalyst 3850-48p-e » Version: N/A
When used together with: Cisco » Catalyst 3850-48p-l » Version: N/A
When used together with: Cisco » Catalyst 3850-48p-s » Version: N/A
When used together with: Cisco » Catalyst 3850-48pw-s » Version: N/A
When used together with: Cisco » Catalyst 3850-48t-e » Version: N/A
When used together with: Cisco » Catalyst 3850-48t-l » Version: N/A
When used together with: Cisco » Catalyst 3850-48t-s » Version: N/A
When used together with: Cisco » Catalyst 3850-48u » Version: N/A
When used together with: Cisco » Catalyst 3850-48u-e » Version: N/A
When used together with: Cisco » Catalyst 3850-48u-l » Version: N/A
When used together with: Cisco » Catalyst 3850-48u-s » Version: N/A
When used together with: Cisco » Catalyst 3850-48xs » Version: N/A
When used together with: Cisco » Catalyst 3850-48xs-e » Version: N/A
When used together with: Cisco » Catalyst 3850-48xs-f-e » Version: N/A
When used together with: Cisco » Catalyst 3850-48xs-f-s » Version: N/A
When used together with: Cisco » Catalyst 3850-48xs-s » Version: N/A
When used together with: Cisco » Catalyst 3850-nm-2-40g » Version: N/A
When used together with: Cisco » Catalyst 3850-nm-8-10g » Version: N/A
When used together with: Cisco » Catalyst 9200 » Version: N/A
When used together with: Cisco » Catalyst 9300 » Version: N/A
When used together with: Cisco » Catalyst 9300-24p-a » Version: N/A
When used together with: Cisco » Catalyst 9300-24p-e » Version: N/A
When used together with: Cisco » Catalyst 9300-24s-a » Version: N/A
When used together with: Cisco » Catalyst 9300-24s-e » Version: N/A
When used together with: Cisco » Catalyst 9300-24t-a » Version: N/A
When used together with: Cisco » Catalyst 9300-24t-e » Version: N/A
When used together with: Cisco » Catalyst 9300-24u-a » Version: N/A
When used together with: Cisco » Catalyst 9300-24u-e » Version: N/A
When used together with: Cisco » Catalyst 9300-24ux-a » Version: N/A
When used together with: Cisco » Catalyst 9300-24ux-e » Version: N/A
When used together with: Cisco » Catalyst 9300-48p-a » Version: N/A
When used together with: Cisco » Catalyst 9300-48p-e » Version: N/A
When used together with: Cisco » Catalyst 9300-48s-a » Version: N/A
When used together with: Cisco » Catalyst 9300-48s-e » Version: N/A
When used together with: Cisco » Catalyst 9300-48t-a » Version: N/A
When used together with: Cisco » Catalyst 9300-48t-e » Version: N/A
When used together with: Cisco » Catalyst 9300-48u-a » Version: N/A
When used together with: Cisco » Catalyst 9300-48u-e » Version: N/A
When used together with: Cisco » Catalyst 9300-48un-a » Version: N/A
When used together with: Cisco » Catalyst 9300-48un-e » Version: N/A
When used together with: Cisco » Catalyst 9300-48uxm-a » Version: N/A
When used together with: Cisco » Catalyst 9300-48uxm-e » Version: N/A
When used together with: Cisco » Catalyst 9300l » Version: N/A
When used together with: Cisco » Catalyst 9300l-24p-4g-a » Version: N/A
When used together with: Cisco » Catalyst 9300l-24p-4g-e » Version: N/A
When used together with: Cisco » Catalyst 9300l-24p-4x-a » Version: N/A
When used together with: Cisco » Catalyst 9300l-24p-4x-e » Version: N/A
When used together with: Cisco » Catalyst 9300l-24t-4g-a » Version: N/A
When used together with: Cisco » Catalyst 9300l-24t-4g-e » Version: N/A
When used together with: Cisco » Catalyst 9300l-24t-4x-a » Version: N/A
When used together with: Cisco » Catalyst 9300l-24t-4x-e » Version: N/A
When used together with: Cisco » Catalyst 9300l-48p-4g-a » Version: N/A
When used together with: Cisco » Catalyst 9300l-48p-4g-e » Version: N/A
When used together with: Cisco » Catalyst 9300l-48p-4x-a » Version: N/A
When used together with: Cisco » Catalyst 9300l-48p-4x-e » Version: N/A
When used together with: Cisco » Catalyst 9300l-48t-4g-a » Version: N/A
When used together with: Cisco » Catalyst 9300l-48t-4g-e » Version: N/A
When used together with: Cisco » Catalyst 9300l-48t-4x-a » Version: N/A
When used together with: Cisco » Catalyst 9300l-48t-4x-e » Version: N/A
When used together with: Cisco » Catalyst 9300l Stack » Version: N/A
When used together with: Cisco » Catalyst 9400 » Version: N/A
When used together with: Cisco » Catalyst 9407r » Version: N/A
When used together with: Cisco » Catalyst 9410r » Version: N/A
When used together with: Cisco » Catalyst 9500 » Version: N/A
When used together with: Cisco » Catalyst 9600 » Version: N/A
When used together with: Cisco » Catalyst 9800 » Version: N/A
When used together with: Cisco » Catalyst 9800-40 » Version: N/A
When used together with: Cisco » Catalyst 9800-80 » Version: N/A
When used together with: Cisco » Catalyst 9800-cl » Version: N/A
When used together with: Cisco » Catalyst 9800-l » Version: N/A
When used together with: Cisco » Catalyst 9800-l-c » Version: N/A
When used together with: Cisco » Catalyst 9800-l-f » Version: N/A
Cisco » Ios Xe
Versions up to, including, (<=) 16.12.3
cpe:2.3:o:cisco:ios_xe:*:*:*:*:*:*:*:*
Matching versions
When used together with: Cisco » 1000 Integrated Services Router » Version: N/A
When used together with: Cisco » 1100-4g/6g Integrated Services Router » Version: N/A
When used together with: Cisco » 1100-4p Integrated Services Router » Version: N/A
When used together with: Cisco » 1100-8p Integrated Services Router » Version: N/A
When used together with: Cisco » 1100 Integrated Services Router » Version: N/A
When used together with: Cisco » 1101-4p Integrated Services Router » Version: N/A
When used together with: Cisco » 1101 Integrated Services Router » Version: N/A
When used together with: Cisco » 1109-2p Integrated Services Router » Version: N/A
When used together with: Cisco » 1109-4p Integrated Services Router » Version: N/A
When used together with: Cisco » 1109 Integrated Services Router » Version: N/A
When used together with: Cisco » 1111x-8p Integrated Services Router » Version: N/A
When used together with: Cisco » 1111x Integrated Services Router » Version: N/A
When used together with: Cisco » 111x Integrated Services Router » Version: N/A
When used together with: Cisco » 1120 Integrated Services Router » Version: N/A
When used together with: Cisco » 1160 Integrated Services Router » Version: N/A
When used together with: Cisco » 4000 Integrated Services Router » Version: N/A
When used together with: Cisco » 4221 Integrated Services Router » Version: N/A
When used together with: Cisco » 4321 Integrated Services Router » Version: N/A
When used together with: Cisco » 4331 Integrated Services Router » Version: N/A
When used together with: Cisco » 4351 Integrated Services Router » Version: N/A
When used together with: Cisco » 4431 Integrated Services Router » Version: N/A
When used together with: Cisco » 4451-x Integrated Services Router » Version: N/A
When used together with: Cisco » 4451 Integrated Services Router » Version: N/A
When used together with: Cisco » 4461 Integrated Services Router » Version: N/A
When used together with: Cisco » Catalyst 3650-12x48fd-e » Version: N/A
When used together with: Cisco » Catalyst 3650-12x48fd-l » Version: N/A
When used together with: Cisco » Catalyst 3650-12x48fd-s » Version: N/A
When used together with: Cisco » Catalyst 3650-12x48uq » Version: N/A
When used together with: Cisco » Catalyst 3650-12x48uq-e » Version: N/A
When used together with: Cisco » Catalyst 3650-12x48uq-l » Version: N/A
When used together with: Cisco » Catalyst 3650-12x48uq-s » Version: N/A
When used together with: Cisco » Catalyst 3650-12x48ur » Version: N/A
When used together with: Cisco » Catalyst 3650-12x48ur-e » Version: N/A
When used together with: Cisco » Catalyst 3650-12x48ur-l » Version: N/A
When used together with: Cisco » Catalyst 3650-12x48ur-s » Version: N/A
When used together with: Cisco » Catalyst 3650-12x48uz » Version: N/A
When used together with: Cisco » Catalyst 3650-12x48uz-e » Version: N/A
When used together with: Cisco » Catalyst 3650-12x48uz-l » Version: N/A
When used together with: Cisco » Catalyst 3650-12x48uz-s » Version: N/A
When used together with: Cisco » Catalyst 3650-24pd » Version: N/A
When used together with: Cisco » Catalyst 3650-24pd-e » Version: N/A
When used together with: Cisco » Catalyst 3650-24pd-l » Version: N/A
When used together with: Cisco » Catalyst 3650-24pd-s » Version: N/A
When used together with: Cisco » Catalyst 3650-24pdm » Version: N/A
When used together with: Cisco » Catalyst 3650-24pdm-e » Version: N/A
When used together with: Cisco » Catalyst 3650-24pdm-l » Version: N/A
When used together with: Cisco » Catalyst 3650-24pdm-s » Version: N/A
When used together with: Cisco » Catalyst 3650-24ps-e » Version: N/A
When used together with: Cisco » Catalyst 3650-24ps-l » Version: N/A
When used together with: Cisco » Catalyst 3650-24ps-s » Version: N/A
When used together with: Cisco » Catalyst 3650-24td-e » Version: N/A
When used together with: Cisco » Catalyst 3650-24td-l » Version: N/A
When used together with: Cisco » Catalyst 3650-24td-s » Version: N/A
When used together with: Cisco » Catalyst 3650-24ts-e » Version: N/A
When used together with: Cisco » Catalyst 3650-24ts-l » Version: N/A
When used together with: Cisco » Catalyst 3650-24ts-s » Version: N/A
When used together with: Cisco » Catalyst 3650-48fd-e » Version: N/A
When used together with: Cisco » Catalyst 3650-48fd-l » Version: N/A
When used together with: Cisco » Catalyst 3650-48fd-s » Version: N/A
When used together with: Cisco » Catalyst 3650-48fq » Version: N/A
When used together with: Cisco » Catalyst 3650-48fq-e » Version: N/A
When used together with: Cisco » Catalyst 3650-48fq-l » Version: N/A
When used together with: Cisco » Catalyst 3650-48fq-s » Version: N/A
When used together with: Cisco » Catalyst 3650-48fqm » Version: N/A
When used together with: Cisco » Catalyst 3650-48fqm-e » Version: N/A
When used together with: Cisco » Catalyst 3650-48fqm-l » Version: N/A
When used together with: Cisco » Catalyst 3650-48fqm-s » Version: N/A
When used together with: Cisco » Catalyst 3650-48fs-e » Version: N/A
When used together with: Cisco » Catalyst 3650-48fs-l » Version: N/A
When used together with: Cisco » Catalyst 3650-48fs-s » Version: N/A
When used together with: Cisco » Catalyst 3650-48pd-e » Version: N/A
When used together with: Cisco » Catalyst 3650-48pd-l » Version: N/A
When used together with: Cisco » Catalyst 3650-48pd-s » Version: N/A
When used together with: Cisco » Catalyst 3650-48pq-e » Version: N/A
When used together with: Cisco » Catalyst 3650-48pq-l » Version: N/A
When used together with: Cisco » Catalyst 3650-48pq-s » Version: N/A
When used together with: Cisco » Catalyst 3650-48ps-e » Version: N/A
When used together with: Cisco » Catalyst 3650-48ps-l » Version: N/A
When used together with: Cisco » Catalyst 3650-48ps-s » Version: N/A
When used together with: Cisco » Catalyst 3650-48td-e » Version: N/A
When used together with: Cisco » Catalyst 3650-48td-l » Version: N/A
When used together with: Cisco » Catalyst 3650-48td-s » Version: N/A
When used together with: Cisco » Catalyst 3650-48tq-e » Version: N/A
When used together with: Cisco » Catalyst 3650-48tq-l » Version: N/A
When used together with: Cisco » Catalyst 3650-48tq-s » Version: N/A
When used together with: Cisco » Catalyst 3650-48ts-e » Version: N/A
When used together with: Cisco » Catalyst 3650-48ts-l » Version: N/A
When used together with: Cisco » Catalyst 3650-48ts-s » Version: N/A
When used together with: Cisco » Catalyst 3650-8x24pd-e » Version: N/A
When used together with: Cisco » Catalyst 3650-8x24pd-l » Version: N/A
When used together with: Cisco » Catalyst 3650-8x24pd-s » Version: N/A
When used together with: Cisco » Catalyst 3650-8x24uq » Version: N/A
When used together with: Cisco » Catalyst 3650-8x24uq-e » Version: N/A
When used together with: Cisco » Catalyst 3650-8x24uq-l » Version: N/A
When used together with: Cisco » Catalyst 3650-8x24uq-s » Version: N/A
When used together with: Cisco » Catalyst 3850 » Version: N/A
When used together with: Cisco » Catalyst 3850-12s-e » Version: N/A
When used together with: Cisco » Catalyst 3850-12s-s » Version: N/A
When used together with: Cisco » Catalyst 3850-12x48u » Version: N/A
When used together with: Cisco » Catalyst 3850-12xs-e » Version: N/A
When used together with: Cisco » Catalyst 3850-12xs-s » Version: N/A
When used together with: Cisco » Catalyst 3850-16xs-e » Version: N/A
When used together with: Cisco » Catalyst 3850-16xs-s » Version: N/A
When used together with: Cisco » Catalyst 3850-24p-e » Version: N/A
When used together with: Cisco » Catalyst 3850-24p-l » Version: N/A
When used together with: Cisco » Catalyst 3850-24p-s » Version: N/A
When used together with: Cisco » Catalyst 3850-24pw-s » Version: N/A
When used together with: Cisco » Catalyst 3850-24s-e » Version: N/A
When used together with: Cisco » Catalyst 3850-24s-s » Version: N/A
When used together with: Cisco » Catalyst 3850-24t-e » Version: N/A
When used together with: Cisco » Catalyst 3850-24t-l » Version: N/A
When used together with: Cisco » Catalyst 3850-24t-s » Version: N/A
When used together with: Cisco » Catalyst 3850-24u » Version: N/A
When used together with: Cisco » Catalyst 3850-24u-e » Version: N/A
When used together with: Cisco » Catalyst 3850-24u-l » Version: N/A
When used together with: Cisco » Catalyst 3850-24u-s » Version: N/A
When used together with: Cisco » Catalyst 3850-24xs » Version: N/A
When used together with: Cisco » Catalyst 3850-24xs-e » Version: N/A
When used together with: Cisco » Catalyst 3850-24xs-s » Version: N/A
When used together with: Cisco » Catalyst 3850-24xu » Version: N/A
When used together with: Cisco » Catalyst 3850-24xu-e » Version: N/A
When used together with: Cisco » Catalyst 3850-24xu-l » Version: N/A
When used together with: Cisco » Catalyst 3850-24xu-s » Version: N/A
When used together with: Cisco » Catalyst 3850-32xs-e » Version: N/A
When used together with: Cisco » Catalyst 3850-32xs-s » Version: N/A
When used together with: Cisco » Catalyst 3850-48f-e » Version: N/A
When used together with: Cisco » Catalyst 3850-48f-l » Version: N/A
When used together with: Cisco » Catalyst 3850-48f-s » Version: N/A
When used together with: Cisco » Catalyst 3850-48p-e » Version: N/A
When used together with: Cisco » Catalyst 3850-48p-l » Version: N/A
When used together with: Cisco » Catalyst 3850-48p-s » Version: N/A
When used together with: Cisco » Catalyst 3850-48pw-s » Version: N/A
When used together with: Cisco » Catalyst 3850-48t-e » Version: N/A
When used together with: Cisco » Catalyst 3850-48t-l » Version: N/A
When used together with: Cisco » Catalyst 3850-48t-s » Version: N/A
When used together with: Cisco » Catalyst 3850-48u » Version: N/A
When used together with: Cisco » Catalyst 3850-48u-e » Version: N/A
When used together with: Cisco » Catalyst 3850-48u-l » Version: N/A
When used together with: Cisco » Catalyst 3850-48u-s » Version: N/A
When used together with: Cisco » Catalyst 3850-48xs » Version: N/A
When used together with: Cisco » Catalyst 3850-48xs-e » Version: N/A
When used together with: Cisco » Catalyst 3850-48xs-f-e » Version: N/A
When used together with: Cisco » Catalyst 3850-48xs-f-s » Version: N/A
When used together with: Cisco » Catalyst 3850-48xs-s » Version: N/A
When used together with: Cisco » Catalyst 3850-nm-2-40g » Version: N/A
When used together with: Cisco » Catalyst 3850-nm-8-10g » Version: N/A
When used together with: Cisco » Catalyst 9200 » Version: N/A
When used together with: Cisco » Catalyst 9300 » Version: N/A
When used together with: Cisco » Catalyst 9300-24p-a » Version: N/A
When used together with: Cisco » Catalyst 9300-24p-e » Version: N/A
When used together with: Cisco » Catalyst 9300-24s-a » Version: N/A
When used together with: Cisco » Catalyst 9300-24s-e » Version: N/A
When used together with: Cisco » Catalyst 9300-24t-a » Version: N/A
When used together with: Cisco » Catalyst 9300-24t-e » Version: N/A
When used together with: Cisco » Catalyst 9300-24u-a » Version: N/A
When used together with: Cisco » Catalyst 9300-24u-e » Version: N/A
When used together with: Cisco » Catalyst 9300-24ux-a » Version: N/A
When used together with: Cisco » Catalyst 9300-24ux-e » Version: N/A
When used together with: Cisco » Catalyst 9300-48p-a » Version: N/A
When used together with: Cisco » Catalyst 9300-48p-e » Version: N/A
When used together with: Cisco » Catalyst 9300-48s-a » Version: N/A
When used together with: Cisco » Catalyst 9300-48s-e » Version: N/A
When used together with: Cisco » Catalyst 9300-48t-a » Version: N/A
When used together with: Cisco » Catalyst 9300-48t-e » Version: N/A
When used together with: Cisco » Catalyst 9300-48u-a » Version: N/A
When used together with: Cisco » Catalyst 9300-48u-e » Version: N/A
When used together with: Cisco » Catalyst 9300-48un-a » Version: N/A
When used together with: Cisco » Catalyst 9300-48un-e » Version: N/A
When used together with: Cisco » Catalyst 9300-48uxm-a » Version: N/A
When used together with: Cisco » Catalyst 9300-48uxm-e » Version: N/A
When used together with: Cisco » Catalyst 9300l » Version: N/A
When used together with: Cisco » Catalyst 9300l-24p-4g-a » Version: N/A
When used together with: Cisco » Catalyst 9300l-24p-4g-e » Version: N/A
When used together with: Cisco » Catalyst 9300l-24p-4x-a » Version: N/A
When used together with: Cisco » Catalyst 9300l-24p-4x-e » Version: N/A
When used together with: Cisco » Catalyst 9300l-24t-4g-a » Version: N/A
When used together with: Cisco » Catalyst 9300l-24t-4g-e » Version: N/A
When used together with: Cisco » Catalyst 9300l-24t-4x-a » Version: N/A
When used together with: Cisco » Catalyst 9300l-24t-4x-e » Version: N/A
When used together with: Cisco » Catalyst 9300l-48p-4g-a » Version: N/A
When used together with: Cisco » Catalyst 9300l-48p-4g-e » Version: N/A
When used together with: Cisco » Catalyst 9300l-48p-4x-a » Version: N/A
When used together with: Cisco » Catalyst 9300l-48p-4x-e » Version: N/A
When used together with: Cisco » Catalyst 9300l-48t-4g-a » Version: N/A
When used together with: Cisco » Catalyst 9300l-48t-4g-e » Version: N/A
When used together with: Cisco » Catalyst 9300l-48t-4x-a » Version: N/A
When used together with: Cisco » Catalyst 9300l-48t-4x-e » Version: N/A
When used together with: Cisco » Catalyst 9300l Stack » Version: N/A
When used together with: Cisco » Catalyst 9400 » Version: N/A
When used together with: Cisco » Catalyst 9407r » Version: N/A
When used together with: Cisco » Catalyst 9410r » Version: N/A
When used together with: Cisco » Catalyst 9500 » Version: N/A
When used together with: Cisco » Catalyst 9600 » Version: N/A
When used together with: Cisco » Catalyst 9800 » Version: N/A
When used together with: Cisco » Catalyst 9800-40 » Version: N/A
When used together with: Cisco » Catalyst 9800-80 » Version: N/A
When used together with: Cisco » Catalyst 9800-cl » Version: N/A
When used together with: Cisco » Catalyst 9800-l » Version: N/A
When used together with: Cisco » Catalyst 9800-l-c » Version: N/A
When used together with: Cisco » Catalyst 9800-l-f » Version: N/A

Max 200 conditions are displayed on this page, to prevent potential performance issues, please refer to NVD for more details.

Exploit prediction scoring system (EPSS) score for CVE-2021-34703

EPSS FAQ

0.11%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 43 %

Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2021-34703

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
6.8	MEDIUM	AV:N/AC:L/Au:S/C:N/I:N/A:C	8.0	6.9	NIST
Access Vector: Network Access Complexity: Low Authentication: Single Confidentiality Impact: None Integrity Impact: None Availability Impact: Complete
6.8	MEDIUM	CVSS:3.0/AV:A/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H	2.3	4.0	Cisco Systems, Inc.
Attack Vector: Adjacent Network Attack Complexity: Low Privileges Required: Low User Interaction: None Scope: Changed Confidentiality: None Integrity: None Availability: High
6.5	MEDIUM	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H	2.8	3.6	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: Low User Interaction: None Scope: Unchanged Confidentiality: None Integrity: None Availability: High

CWE ids for CVE-2021-34703

CWE-456 Missing Initialization of a Variable

The product does not initialize critical variables, which causes the execution environment to use unexpected values.

Assigned by: ykramarz@cisco.com (Secondary)
CWE-665 Improper Initialization

The product does not initialize or incorrectly initializes a resource, which might leave the resource in an unexpected state when it is accessed or used.

Assigned by: nvd@nist.gov (Primary)

References for CVE-2021-34703

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-lldp-dos-sBnuHSjT

Cisco IOS and IOS XE Software Link Layer Discovery Protocol Denial of Service Vulnerability
Vendor Advisory

Jump to

Vulnerability Details : CVE-2021-34703

Products affected by CVE-2021-34703

Exploit prediction scoring system (EPSS) score for CVE-2021-34703

CVSS scores for CVE-2021-34703

CWE ids for CVE-2021-34703

References for CVE-2021-34703