CVE-2022-20678

Published: Apr 15, 2022Modified: Jun 17, 2026

7.5

Vector

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

Exploitability: 3.9 / Impact: 3.6

Source: NVD

Description

A vulnerability in the AppNav-XE feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a denial of service (DoS) condition. This vulnerability is due to the incorrect handling of certain TCP segments. An attacker could exploit this vulnerability by sending a stream of crafted TCP traffic at a high rate through an interface of an affected device. That interface would need to have AppNav interception enabled. A successful exploit could allow the attacker to cause the device to reload.

Affected (4)

Products: Cisco: Ios Xe

Cisco

1 product

Ios Xe

Configuration A

4 vulnerable · 24 platform

Vulnerable Software	Affected Versions
Cisco Ios Xe	Version 16.12.4
Cisco Ios Xe	Version 16.12.5
Cisco Ios Xe	Version 16.9.6
Cisco Ios Xe	Version 17.3.3

Running on/with	Platform Versions
Cisco 1100 4g Integrated Services Router	All versions
Cisco 1100 6g Integrated Services Router	All versions
Cisco 1101 Integrated Services Router	All versions
Cisco 1109 Integrated Services Router	All versions
Cisco 1111x Integrated Services Router	All versions
Cisco 111x Integrated Services Router	All versions
Cisco 1120 Integrated Services Router	All versions
Cisco 1131 Integrated Services Router	All versions
Cisco 1160 Integrated Services Router	All versions
Cisco 4221 Integrated Services Router	All versions
Cisco 4331 Integrated Services Router	All versions
Cisco 4431 Integrated Services Router	All versions
Cisco 4461 Integrated Services Router	All versions
Cisco Asr 1001 X	All versions
Cisco Asr 1002 X	All versions
Cisco Catalyst 8000v Edge	All versions
Cisco Catalyst 8300 1n1s 4t2x	All versions
Cisco Catalyst 8300 1n1s 6t	All versions
Cisco Catalyst 8300 2n2s 4t2x	All versions
Cisco Catalyst 8300 2n2s 6t	All versions
Cisco Catalyst 8500	All versions
Cisco Catalyst 8500 4qc	All versions
Cisco Catalyst 8500l	All versions
Cisco Cloud Services Router 1000v	All versions

Related CWEs

CWE-413

Improper Resource Locking

The product does not lock or does not correctly lock a resource when the product must have exclusive access to the resource.

CWE-755

Improper Handling of Exceptional Conditions

The product does not handle or incorrectly handles an exceptional condition.

References (2)

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-appnav-xe-dos-j5MXTR4

Source: psirt@cisco.com

Vendor Advisory

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-appnav-xe-dos-j5MXTR4

Source: af854a3a-2127-422b-91ae-364da2661108

Vendor Advisory

Timeline

No history available yet.