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Last Modified on: 10/13/2022 07:59:00 PM UTC

CVE-2022-20837 - advisory for cisco-sa-alg-dos-KU9Z8kFX

Source: Mitre Source: NIST CVE.ORG Print: PDF PDF

Certain versions of Asr 1000-esp100-x from Cisco contain the following vulnerability:

A vulnerability in the DNS application layer gateway (ALG) functionality that is used by Network Address Translation (NAT) in Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload. This vulnerability is due to a logic error that occurs when an affected device inspects certain TCP DNS packets. An attacker could exploit this vulnerability by sending crafted DNS packets through the affected device that is performing NAT for DNS packets. A successful exploit could allow the attacker to cause the device to reload, resulting in a denial of service (DoS) condition on the affected device. Note: This vulnerability can be exploited only by sending IPv4 TCP packets through an affected device. This vulnerability cannot be exploited by sending IPv6 traffic.

  • CVE-2022-20837 has been assigned by URL Logo [email protected] to track the vulnerability - currently rated as HIGH severity.
  • The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.
  • Affected Vendor/Software: URL Logo Cisco - Cisco IOS XE Software version n/a

CVSS3 Score: 8.6 - HIGH

Scope Confidentiality

CVE References

Description Tags Link
No Description Provided
URL Logo CISCO 20220928 Cisco IOS XE Software DNS NAT Protocol Application Layer Gateway Denial of Service Vulnerability

Related QID Numbers

  • 317235 Cisco Internetwork Operating System (IOS) XE Software Domain Name System (DNS) NAT Protocol Application Layer Gateway Denial of Service (DoS) Vulnerability (cisco-sa-alg-dos-KU9Z8kFX)

Known Affected Configurations (CPE V2.3)

Type Vendor Product Version Update Edition Language
Hardware Device InfoCiscoAsr 1000-esp100-x-AllAllAll
Hardware Device InfoCiscoAsr 1000-esp200-x-AllAllAll
Hardware Device InfoCiscoCatalyst 8500-AllAllAll
Hardware Device InfoCiscoCatalyst 8500-4qc-AllAllAll
CiscoIos Xe-AllAllAll
  • cpe:2.3:h:cisco:asr_1000-esp100-x:-:*:*:*:*:*:*:*:
  • cpe:2.3:h:cisco:asr_1000-esp200-x:-:*:*:*:*:*:*:*:
  • cpe:2.3:h:cisco:catalyst_8500:-:*:*:*:*:*:*:*:
  • cpe:2.3:h:cisco:catalyst_8500-4qc:-:*:*:*:*:*:*:*:
  • cpe:2.3:o:cisco:ios_xe:-:*:*:*:*:*:*:*:

Social Mentions

Source Title Posted (UTC)
Twitter Icon @RedPacketSec Cisco IOS XE Software denial of service | CVE-2022-20837 -… #CVE #Vulnerability #OSINT #ThreatIntel #Cyber 2022-09-29 09:01:36
Twitter Icon @sidfm_jp Cisco IOS XE の DNS ALG の処理にサービスを妨害される問題 (CVE-2022-20837) [43440]… #SIDfm #脆弱性情報 2022-09-30 02:00:03
Twitter Icon @CVEreport CVE-2022-20837 : A vulnerability in the DNS application layer gateway ALG functionality that is used by Network…… 2022-10-10 20:54:02
Reddit Logo Icon /r/netcve CVE-2022-20837 2022-10-10 21:39:01
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