Improper Resource Locking in Cisco Systems, Inc products - CVE-2022-20678

Vulnerability identifier: #VU62317

CSH Severity: High

CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2022-20678

CWE-ID: CWE-413

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to the incorrect handling of certain TCP segments in the AppNav-XE feature. A remote attacker can send a stream of crafted TCP traffic and perform a denial of service (DoS) attack.

Cisco 1000 Series Integrated Services Routers
4000 Series Integrated Services Routers
ASR 1001-X Router
ASR 1002-X Router
Catalyst 8300 Series Routers
Catalyst 8500 Series Routers
Catalyst 8000V Edge Software
Cloud Services Router 1000V Series
Cisco IOS XE

Install updates from vendor's website.

Cisco IOS XE - addressed in versions Amsterdam-17.3.4, Bengaluru-17.4.2, Bengaluru-17.5.1, Bengaluru-17.6.1, Gibraltar-16.12.6, 16.12(5.24), 16.12.6, 17.3(3.6), 17.3.4, 17.3.4 b, 17.4(1.62), 17.4.2, 17.5(0.184), 17.5.1, 17.6(0.52), 17.6.1

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

• Denial of service in Cisco IOS XE Software AppNav-XE