CVE-2022-20691 Denial of service in Cisco Analog Telephone Adaptor (ATA) Software

Medium 5.3 Published 7 Dec 2022 Updated 3 Aug 2024

An unauthenticated adjacent attacker can cause a denial of service on Cisco ATA devices by sending crafted CDP packets that exhaust memory.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2022-20691?

CVE-2022-20691 is a medium-severity denial of service vulnerability in Cisco Analog Telephone Adaptor (ATA) Software, published on 7 Dec 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A vulnerability in the Cisco Discovery Protocol functionality of Cisco ATA 190 Series Adaptive Telephone Adapter firmware could allow an unauthenticated, adjacent attacker to cause a DoS condition of an affected device. This vulnerability is due to missing length validation of certain Cisco Discovery Protocol packet header fields. An attacker could exploit this vulnerability by sending crafted Cisco Discovery Protocol packets to an affected device. A successful exploit could allow the attacker to cause the device to exhaust available memory and cause the service to restart. Cisco has released firmware updates that address this vulnerability.

Weakness: CWE-1284, CWE-400

Which versions are affected by CVE-2022-20691?

It affects 3 products.

Products include Cisco Ata 190 Firmware, Cisco Ata 191 Firmware, Cisco Ata 192 Firmware.

How do I fix CVE-2022-20691?

No fix has been published for CVE-2022-20691 yet. Limit exposure of the affected software until one is available.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2022-20691 being exploited?

There is no known exploitation of CVE-2022-20691 in the wild and no public exploit code.

Sources

Also known as GHSA-3f75-4wmv-vpf2.