Denial of service in Cisco IOS XE Software AppNav-XE

1) Improper Resource Locking

EUVDB-ID: #VU62317

Risk: High

CVSSv3.1: 7.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-20678

CWE-ID: CWE-413 - Improper Resource Locking

Exploit availability: No

Description

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.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Cisco IOS XE: 16.9.6 - 17.3.3

Cisco 1000 Series Integrated Services Routers: All versions

4000 Series Integrated Services Routers: All versions

ASR 1001-X Router : All versions

ASR 1002-X Router : All versions

Catalyst 8300 Series Routers: All versions

Catalyst 8500 Series Routers: All versions

Catalyst 8000V Edge Software: All versions

Cloud Services Router 1000V Series: All versions

External links

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

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.