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

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: yes — in CISA KEV since 2022-05-24
EPSS: 87.6% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2016-08-18 · updated 2026-06-17
Weakness: CWE-120

Description

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 ASA Software: from 7.2.1 before 9.0.4.40; from 9.1.1 before 9.1.7\(9\); from 9.2.0 before 9.2.4\(14\); from 9.3.0 before 9.3.3\(10\); from 9.4.0.115 before 9.4.3\(8\); from 9.5.0 through 9.5\(3\) — fixed in 9.0.4.40, 9.1.7\(9\), 9.2.4\(14\), 9.3.3\(10\), 9.4.3\(8\), 9.6.1\(11\)
Cisco Asa 1000V Cloud Firewall Software: 8.7.1, 8.7.1.1
Cisco Pix Firewall Software: all versions

How to fix

Upgrade to a fixed version: Cisco ASA Software 9.0.4.40, 9.1.7\(9\), 9.2.4\(14\), 9.3.3\(10\). Check the vendor advisory for mitigations.

References

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