CVE-2022-20689

Severity: high (CVSS 8.8 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-130

Description

Multiple vulnerabilities in the Cisco Discovery Protocol functionality of Cisco ATA 190 Series Analog Telephone Adapter firmware could allow an unauthenticated, adjacent attacker to cause Cisco Discovery Protocol memory corruption on an affected device. These vulnerabilities are due to missing length validation checks when processing Cisco Discovery Protocol messages. An attacker could exploit these vulnerabilities by sending a malicious Cisco Discovery Protocol packet to an affected device. A successful exploit could allow the attacker to cause an out-of-bounds read of the valid Cisco Discovery Protocol packet data, which could allow the attacker to cause corruption in the internal Cisco Discovery Protocol database of the affected device.

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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