CVE-2020-3404 : A vulnerability in the persistent Telnet/Secure Shell (SSH) CLI of Cisco IOS XE

A vulnerability in the persistent Telnet/Secure Shell (SSH) CLI of Cisco IOS XE Software could allow an authenticated, local attacker to gain shell access on an affected device and execute commands on the underlying operating system (OS) with root privileges. The vulnerability is due to insufficient enforcement of the consent token in authorizing shell access. An attacker could exploit this vulnerability by authenticating to the persistent Telnet/SSH CLI on an affected device and requesting shell access. A successful exploit could allow the attacker to gain shell access on the affected device and execute commands on the underlying OS with root privileges.

Published 2020-09-24 18:15:18

Updated 2023-05-23 13:55:46

Source Cisco Systems, Inc.

View at NVD, CVE.org

Products affected by CVE-2020-3404

Cisco » Ios Xe » Version: 16.11.1
cpe:2.3:a:cisco:ios_xe:16.11.1:*:*:*:*:*:*:*
Matching versions
When used together with: Cisco » 1100-4g Integrated Services Router » Version: N/A
When used together with: Cisco » 1100-4gltegb Integrated Services Router » Version: N/A
When used together with: Cisco » 1100-4gltena Integrated Services Router » Version: N/A
When used together with: Cisco » 1100-4p Integrated Services Router » Version: N/A
When used together with: Cisco » 1100-6g 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-lte 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 » 4221 Integrated Services Router » Version: N/A
When used together with: Cisco » 4331 Integrated Services Router » Version: N/A
When used together with: Cisco » 4431 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 » Asr 1000-x » Version: N/A
When used together with: Cisco » Asr 1001 » Version: N/A
When used together with: Cisco » Asr 1001-x » Version: N/A
When used together with: Cisco » Asr 1002 » Version: N/A
When used together with: Cisco » Asr 1002-x » Version: N/A
When used together with: Cisco » Asr 1004 » Version: N/A
When used together with: Cisco » Asr 1006 » Version: N/A
When used together with: Cisco » Asr 1013 » Version: N/A
When used together with: Cisco » Asr1001-hx » Version: N/A
When used together with: Cisco » Asr1001-hx-rf » Version: N/A
When used together with: Cisco » Asr1001-x-rf » Version: N/A
When used together with: Cisco » Asr1001-x-ws » Version: N/A
When used together with: Cisco » Asr1002-hx » Version: N/A
When used together with: Cisco » Asr1002-hx-rf » Version: N/A
When used together with: Cisco » Asr1002-hx-ws » Version: N/A
When used together with: Cisco » Asr1002-x-rf » Version: N/A
When used together with: Cisco » Asr1002-x-ws » 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
When used together with: Cisco » Catalyst C9200-24p » Version: N/A
When used together with: Cisco » Catalyst C9200-24t » Version: N/A
When used together with: Cisco » Catalyst C9200-48p » Version: N/A
When used together with: Cisco » Catalyst C9200-48t » Version: N/A
When used together with: Cisco » Catalyst C9200l-24p-4g » Version: N/A
When used together with: Cisco » Catalyst C9200l-24p-4x » Version: N/A
When used together with: Cisco » Catalyst C9200l-24pxg-2y » Version: N/A
When used together with: Cisco » Catalyst C9200l-24pxg-4x » Version: N/A
When used together with: Cisco » Catalyst C9200l-24t-4g » Version: N/A
When used together with: Cisco » Catalyst C9200l-24t-4x » Version: N/A
When used together with: Cisco » Catalyst C9200l-48p-4g » Version: N/A
When used together with: Cisco » Catalyst C9200l-48p-4x » Version: N/A
When used together with: Cisco » Catalyst C9200l-48pxg-2y » Version: N/A
When used together with: Cisco » Catalyst C9200l-48pxg-4x » Version: N/A
When used together with: Cisco » Catalyst C9200l-48t-4g » Version: N/A
When used together with: Cisco » Catalyst C9200l-48t-4x » Version: N/A
When used together with: Cisco » Catalyst C9300-24p » Version: N/A
When used together with: Cisco » Catalyst C9300-24s » Version: N/A
When used together with: Cisco » Catalyst C9300-24t » Version: N/A
When used together with: Cisco » Catalyst C9300-24u » Version: N/A
When used together with: Cisco » Catalyst C9300-24ux » Version: N/A
When used together with: Cisco » Catalyst C9300-48p » Version: N/A
When used together with: Cisco » Catalyst C9300-48s » Version: N/A
When used together with: Cisco » Catalyst C9300-48t » Version: N/A
When used together with: Cisco » Catalyst C9300-48u » Version: N/A
When used together with: Cisco » Catalyst C9300-48un » Version: N/A
When used together with: Cisco » Catalyst C9300-48uxm » Version: N/A
When used together with: Cisco » Catalyst C9300l-24p-4g » Version: N/A
When used together with: Cisco » Catalyst C9300l-24p-4x » Version: N/A
When used together with: Cisco » Catalyst C9300l-24t-4g » Version: N/A
When used together with: Cisco » Catalyst C9300l-24t-4x » Version: N/A
When used together with: Cisco » Catalyst C9300l-48p-4g » Version: N/A
When used together with: Cisco » Catalyst C9300l-48p-4x » Version: N/A
When used together with: Cisco » Catalyst C9300l-48t-4g » Version: N/A
When used together with: Cisco » Catalyst C9300l-48t-4x » Version: N/A
When used together with: Cisco » Catalyst C9404r » Version: N/A
When used together with: Cisco » Catalyst C9407r » Version: N/A
When used together with: Cisco » Catalyst C9410r » Version: N/A
When used together with: Cisco » Catalyst C9500-12q » Version: N/A
When used together with: Cisco » Catalyst C9500-16x » Version: N/A
When used together with: Cisco » Catalyst C9500-24q » Version: N/A
When used together with: Cisco » Catalyst C9500-24y4c » Version: N/A
When used together with: Cisco » Catalyst C9500-32c » Version: N/A
When used together with: Cisco » Catalyst C9500-32qc » Version: N/A
When used together with: Cisco » Catalyst C9500-40x » Version: N/A
When used together with: Cisco » Catalyst C9500-48y4c » Version: N/A
When used together with: Cisco » Csr 1000v
When used together with: Cisco » Ws-c3650-12x48uq » Version: N/A
When used together with: Cisco » Ws-c3650-12x48ur » Version: N/A
When used together with: Cisco » Ws-c3650-12x48uz » Version: N/A
When used together with: Cisco » Ws-c3650-24pd » Version: N/A
When used together with: Cisco » Ws-c3650-24pdm » Version: N/A
When used together with: Cisco » Ws-c3650-24ps » Version: N/A
When used together with: Cisco » Ws-c3650-24td » Version: N/A
When used together with: Cisco » Ws-c3650-24ts » Version: N/A
When used together with: Cisco » Ws-c3650-48fd » Version: N/A
When used together with: Cisco » Ws-c3650-48fq » Version: N/A
When used together with: Cisco » Ws-c3650-48fqm » Version: N/A
When used together with: Cisco » Ws-c3650-48fs » Version: N/A
When used together with: Cisco » Ws-c3650-48pd » Version: N/A
When used together with: Cisco » Ws-c3650-48pq » Version: N/A
When used together with: Cisco » Ws-c3650-48ps » Version: N/A
When used together with: Cisco » Ws-c3650-48td » Version: N/A
When used together with: Cisco » Ws-c3650-48tq » Version: N/A
When used together with: Cisco » Ws-c3650-48ts » Version: N/A
When used together with: Cisco » Ws-c3650-8x24uq » Version: N/A
When used together with: Cisco » Ws-c3850 » Version: N/A
When used together with: Cisco » Ws-c3850-12s » Version: N/A
When used together with: Cisco » Ws-c3850-12x48u » Version: N/A
When used together with: Cisco » Ws-c3850-12xs » Version: N/A
When used together with: Cisco » Ws-c3850-24p » Version: N/A
When used together with: Cisco » Ws-c3850-24s » Version: N/A
When used together with: Cisco » Ws-c3850-24t » Version: N/A
When used together with: Cisco » Ws-c3850-24u » Version: N/A
When used together with: Cisco » Ws-c3850-24xs » Version: N/A
When used together with: Cisco » Ws-c3850-24xu » Version: N/A
When used together with: Cisco » Ws-c3850-48f » Version: N/A
When used together with: Cisco » Ws-c3850-48p » Version: N/A
When used together with: Cisco » Ws-c3850-48t » Version: N/A
When used together with: Cisco » Ws-c3850-48u » Version: N/A
When used together with: Cisco » Ws-c3850-48xs » Version: N/A

Exploit prediction scoring system (EPSS) score for CVE-2020-3404

EPSS FAQ

0.04%

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

~ 6 %

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

CVSS scores for CVE-2020-3404

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
7.2	HIGH	AV:L/AC:L/Au:N/C:C/I:C/A:C	3.9	10.0	NIST
Access Vector: Local Access Complexity: Low Authentication: None Confidentiality Impact: Complete Integrity Impact: Complete Availability Impact: Complete
6.7	MEDIUM	CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H	0.8	5.9	Cisco Systems, Inc.
Attack Vector: Local Attack Complexity: Low Privileges Required: High User Interaction: None Scope: Unchanged Confidentiality: High Integrity: High Availability: High
7.8	HIGH	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	1.8	5.9	NIST
Attack Vector: Local Attack Complexity: Low Privileges Required: Low User Interaction: None Scope: Unchanged Confidentiality: High Integrity: High Availability: High

CWE ids for CVE-2020-3404

CWE-863 Incorrect Authorization

The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. This allows attackers to bypass intended access restrictions.
Assigned by:
- nvd@nist.gov (Primary)
- ykramarz@cisco.com (Secondary)

References for CVE-2020-3404

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxe-ctbypass-7QHAfHkK

Cisco IOS XE Software Consent Token Bypass Vulnerability
Vendor Advisory

Jump to

Vulnerability Details : CVE-2020-3404

Products affected by CVE-2020-3404

Exploit prediction scoring system (EPSS) score for CVE-2020-3404

CVSS scores for CVE-2020-3404

CWE ids for CVE-2020-3404

References for CVE-2020-3404