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
CVSSv4.0: 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/E:U/U:Amber
CVE-ID: CVE-2022-20837
CWE-ID: CWE-754
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
Cisco IOS XE
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
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
Software vendor:
Cisco Systems, Inc
Cisco Systems, Inc
Description
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.
Remediation
Install updates from vendor's website.