🛡️ CVE-2022-20837
🟠 CVSS 8.6 — High ✅ No Known Exploit CWE-754 NVD
8.6
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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.

Details

Severity HIGH
CVSS Score 8.6
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
CWE CWE-754
Public Exploit ✅ No
Source NVD
Published 2022-10-10
Updated 2026-06-08
Modified 2024-11-21
Fix URL N/A

Affected Packages

Software From version Fixed in
ios-xe

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