CVE-2016-6366: Cisco Adaptive Security Appliance (ASA) SNMP Buffer Overflow Vulnerability

High severity, CVSS 8.8. Actively exploited: in CISA KEV since 2022-05-24. EPSS: 87.6% chance of exploitation in the next 30 days.

Buffer overflow in Cisco Adaptive Security Appliance (ASA) Software through 9.4.2.3 on ASA 5500, ASA 5500-X, ASA Services Module, ASA 1000V, ASAv, Firepower 9300 ASA Security Module, PIX, and FWSM devices allows remote authenticated users to execute arbitrary code via crafted IPv4 SNMP packets, aka Bug ID CSCva92151 or EXTRABACON.

Affected products

• Cisco Adaptive Security Appliance Software: from 7.2.1, before 9.0.4.40 (fixed in 9.0.4.40); from 9.1.1, before 9.1.7\(9\) (fixed in 9.1.7\(9\)); from 9.2.0, before 9.2.4\(14\) (fixed in 9.2.4\(14\)); from 9.3.0, before 9.3.3\(10\) (fixed in 9.3.3\(10\)); from 9.4.0.115, before 9.4.3\(8\) (fixed in 9.4.3\(8\)); from 9.5.0, up to and including 9.5\(3\); …
• Cisco ASA 1000v Cloud Firewall Software: version 8.7.1 only; version 8.7.1.1 only
• Cisco Pix Firewall Software: affected versions not specified

Published 2016-08-18. Last modified 2026-06-17.