CVE-2022-20837

Published on: Not Yet Published

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

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

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

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 [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: Cisco - Cisco IOS XE Software version n/a

CVSS3 Score: 8.6 - HIGH

Attack Vector ^ⓘ	Attack Complexity	Privileges Required	User Interaction
NETWORK	LOW	NONE	NONE
Scope	Confidentiality Impact	Integrity Impact	Availability Impact
CHANGED	NONE	NONE	HIGH

CVE References

Description	Tags ^ⓘ	Link
No Description Provided	tools.cisco.com text/html	CISCO 20220928 Cisco IOS XE Software DNS NAT Protocol Application Layer Gateway Denial of Service Vulnerability

By selecting these links, you may be leaving CVEreport webspace. We have provided these links to other websites because they may have information that would be of interest to you. No inferences should be drawn on account of other sites being referenced, or not, from this page. There may be other websites that are more appropriate for your purpose. CVEreport does not necessarily endorse the views expressed, or concur with the facts presented on these sites. Further, CVEreport does not endorse any commercial products that may be mentioned on these sites. Please address comments about any linked pages to [email protected].

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	Cisco	Asr 1000-esp100-x	-	All	All	All
Hardware	Cisco	Asr 1000-esp200-x	-	All	All	All
Hardware	Cisco	Catalyst 8500	-	All	All	All
Hardware	Cisco	Catalyst 8500-4qc	-	All	All	All
Operating System	Cisco	Ios Xe	-	All	All	All

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:-:*:*:*:*:*:*:*:

No vendor comments have been submitted for this CVE

Social Mentions

Source	Title	Posted (UTC)
@RedPacketSec	Cisco IOS XE Software denial of service \| CVE-2022-20837 - redpacketsecurity.com/cisco-ios-xe-s… #CVE #Vulnerability #OSINT #ThreatIntel #Cyber	2022-09-29 09:01:36
@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] sid.softek.jp/content/show/4… #SIDfm #脆弱性情報	2022-09-30 02:00:03
@CVEreport	CVE-2022-20837 : A vulnerability in the DNS application layer gateway ALG functionality that is used by Network… twitter.com/i/web/status/1…	2022-10-10 20:54:02
/r/netcve	CVE-2022-20837	2022-10-10 21:39:01