CVE-2022-20837 : A vulnerability in the DNS application layer gateway (ALG) functionality that is used by Network Address Translation (NA

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.

Published 2022-10-10 21:15:10

Updated 2022-10-13 19:59:35

Source Cisco Systems, Inc.

View at NVD, CVE.org

Vulnerability category: Denial of service

Products affected by CVE-2022-20837

Cisco » Ios Xe » Version: N/A
cpe:2.3:o:cisco:ios_xe:-:*:*:*:*:*:*:*
Matching versions
When used together with: Cisco » Asr 1000-esp100-x » Version: N/A
When used together with: Cisco » Asr 1000-esp200-x » Version: N/A
When used together with: Cisco » Catalyst 8500 » Version: N/A
When used together with: Cisco » Catalyst 8500-4qc » Version: N/A

Exploit prediction scoring system (EPSS) score for CVE-2022-20837

EPSS FAQ

0.12%

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

~ 45 %

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

CVSS scores for CVE-2022-20837

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
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-2022-20837

CWE-754 Improper Check for Unusual or Exceptional Conditions

The product does not check or incorrectly checks for unusual or exceptional conditions that are not expected to occur frequently during day to day operation of the product.
Assigned by:
- nvd@nist.gov (Primary)
- ykramarz@cisco.com (Secondary)

References for CVE-2022-20837

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-alg-dos-KU9Z8kFX

Cisco IOS XE Software DNS NAT Protocol Application Layer Gateway Denial of Service Vulnerability
Vendor Advisory

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Vulnerability Details : CVE-2022-20837

Products affected by CVE-2022-20837

Exploit prediction scoring system (EPSS) score for CVE-2022-20837

CVSS scores for CVE-2022-20837

CWE ids for CVE-2022-20837

References for CVE-2022-20837