CVE-2022-20691

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2022-12-12 · updated 2026-06-17
Weakness: CWE-400

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.

Affected products

Cisco Ata 190 Firmware: all versions
Cisco Ata 191 Firmware: before 11.2.2; before 12.0.1; 12.0.1, 12.0.1-sr1, 12.0.1-sr2, 12.0.1-sr3, 12.0.1-sr4 — fixed in 11.2.2, 12.0.1
Cisco Ata 192 Firmware: before 11.2.2 — fixed in 11.2.2

How to fix

Upgrade to a fixed version: Cisco Ata 191 Firmware 11.2.2, 12.0.1; Cisco Ata 192 Firmware 11.2.2. Check the vendor advisory for mitigations.

References

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