CVE-2021-1611 : A vulnerability in Ethernet over GRE (EoGRE) packet processing of Cisco IOS XE W

A vulnerability in Ethernet over GRE (EoGRE) packet processing of Cisco IOS XE Wireless Controller Software for the Cisco Catalyst 9800 Family Wireless Controller, Embedded Wireless Controller, and Embedded Wireless on Catalyst 9000 Series Switches could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper processing of malformed EoGRE packets. An attacker could exploit this vulnerability by sending malicious packets to the affected device. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition.

Published 2021-09-23 03:15:12

Updated 2022-07-08 18:23:29

Source Cisco Systems, Inc.

View at NVD, CVE.org

Vulnerability category: Denial of service

Products affected by CVE-2021-1611

Cisco » Ios Xe
Versions before (<) 17.3.1
cpe:2.3:o:cisco:ios_xe:*:*:*:*:*:*:*:*
Matching versions
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

Exploit prediction scoring system (EPSS) score for CVE-2021-1611

EPSS FAQ

0.16%

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

~ 53 %

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

CVSS scores for CVE-2021-1611

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
5.0	MEDIUM	AV:N/AC:L/Au:N/C:N/I:N/A:P	10.0	2.9	NIST
Access Vector: Network Access Complexity: Low Authentication: None Confidentiality Impact: None Integrity Impact: None Availability Impact: Partial
8.6	HIGH	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H	3.9	4.0	Cisco Systems, Inc.
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: None Scope: Changed Confidentiality: None Integrity: None Availability: High
8.6	HIGH	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H	3.9	4.0	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: None Scope: Changed Confidentiality: None Integrity: None Availability: High

CWE ids for CVE-2021-1611

CWE-399

Assigned by: ykramarz@cisco.com (Secondary)

References for CVE-2021-1611

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ewlc-gre-6u4ELzAT

Cisco IOS XE Software for Catalyst 9800 Series Wireless Controllers EoGRE Denial of Service Vulnerability
Patch;Vendor Advisory

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Vulnerability Details : CVE-2021-1611

Products affected by CVE-2021-1611

Exploit prediction scoring system (EPSS) score for CVE-2021-1611

CVSS scores for CVE-2021-1611

CWE ids for CVE-2021-1611

References for CVE-2021-1611