CVE-2022-20686

Multiple vulnerabilities in the Link Layer Discovery Protocol (LLDP) functionality of Cisco ATA 190 Series Analog Telephone Adapter firmware could allow an unauthenticated, remote attacker to execute arbitrary code on an affected device and cause the LLDP service to restart. These vulnerabilities are due to missing length validation of certain LLDP packet header fields. An attacker could exploit these vulnerabilities by sending a malicious LLDP packet to an affected device. A successful exploit could allow the attacker to execute code on the affected device and cause LLDP to restart unexpectedly, resulting in a denial of service (DoS) condition.

• CWE-130
• CWE-1284

• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ata19x-multivuln-GEZYVvs
• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ata19x-multivuln-GEZYVvs

Published

Dec 12, 2022

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2022-20680A vulnerability in the web-based management interface of Cis…6.5
• CVE-2022-20681A vulnerability in the CLI of Cisco IOS XE Software for Cisc…7.8
• CVE-2022-20682A vulnerability in the Control and Provisioning of Wireless …8.6
• CVE-2022-20683A vulnerability in the Application Visibility and Control (A…8.6
• CVE-2022-20684A vulnerability in Simple Network Management Protocol (SNMP)…6.5
• CVE-2022-20685A vulnerability in the Modbus preprocessor of the Snort dete…7.5
• CVE-2022-20687Multiple vulnerabilities in the Link Layer Discovery Protoco…5.3
• CVE-2022-20688A vulnerability in the Cisco Discovery Protocol functionalit…5.3
• CVE-2022-20689Multiple vulnerabilities in the Cisco Discovery Protocol fun…8.8
• CVE-2022-2069The APDFL.dll in Siemens JT2Go prior to V13.3.0.5 and Siemen…7.8
• CVE-2022-20690Multiple vulnerabilities in the Cisco Discovery Protocol fun…8.8
• CVE-2022-20691A vulnerability in the Cisco Discovery Protocol functionalit…6.5