Improper Check for Unusual or Exceptional Conditions in Cisco Systems, Inc products - CVE-2022-20837

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Main Vulnerability Database Vulnerabilities #VU67736

Improper Check for Unusual or Exceptional Conditions in Cisco Systems, Inc products - CVE-2022-20837

Published: September 29, 2022


Vulnerability identifier: #VU67736
CSH Severity: High
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2022-20837
CWE-ID: CWE-754
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a logic error in the DNS application layer gateway (ALG) functionality that is used by Network Address Translation (NAT). A remote attacker can send specially crafted DNS packets and perform a denial of service (DoS) attack.


Affected software

ASR 1000 Series Embedded Services Processors model ESP 100-X
ASR 1000 Series Embedded Services Processors model ESP 200-X
Catalyst 8500 Series Edge Platforms model C8500-12X4QC
Catalyst 8500 Series Edge Platforms model C8500-12X
Cisco IOS XE

How to mitigate CVE-2022-20837

Install updates from vendor's website.

Cisco IOS XE - addressed in versions 16.12.8, 17.3.6, 17.6.1z, 17.6.4, 17.9.1, 17.9.1a

External References

Related Security Bulletins