CVE-2022-20691: Cisco Ata 190 Firmware

Medium severity, CVSS 6.5. EPSS: 0.7% chance of exploitation in the next 30 days.

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.

Affected products

• Cisco Ata 190 Firmware: affected versions not specified
• Cisco Ata 191 Firmware: before 11.2.2 (fixed in 11.2.2); before 12.0.1 (fixed in 12.0.1); version 12.0.1 only
• Cisco Ata 192 Firmware: before 11.2.2 (fixed in 11.2.2)

Published 2022-12-12. Last modified 2026-06-17.