CVE-2022-20837

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.

CVSS v3 8.6 HIGH

8.6^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 4.0

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope CHANGED

References

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

Configurations

Configuration 1 (hide)

AND

cpe:2.3:o:cisco:ios_xe:-:*:*:*:*:*:*:*

OR	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:-:::::::*

History

No history.

Information

Published : 2022-10-10 21:15

Updated : 2024-02-28 19:29

NVD link : CVE-2022-20837

Mitre link : CVE-2022-20837

CVE.ORG link : CVE-2022-20837

JSON object : View

Products Affected

cisco

catalyst_8500
asr_1000-esp100-x
ios_xe
catalyst_8500-4qc
asr_1000-esp200-x

CWE

CWE-754

Improper Check for Unusual or Exceptional Conditions

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