CVE-2016-6366 remediation guide

Cisco Adaptive Security Appliance (ASA)

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.

Open CVE record

ProductCisco Adaptive Security Appliance (ASA)

Affected versions>= 7.2.1 < 9.0.4.40, >= 9.1.1 < 9.1.7\(9\), >= 9.2.0 < 9.2.4\(14\), >= 9.3.0 < 9.3.3\(10\), >= 9.4.0.115 < 9.4.3\(8\), >= 9.5.0 <= 9.5\(3\), >= 9.6.0 < 9.6.1\(11\), 8.7.1, 8.7.1.1

Fixed versions9.0.4.40, 9.1.7\(9\), 9.2.4\(14\), 9.3.3\(10\), 9.4.3\(8\), 9.6.1\(11\)

Priority basisImmediate · CVSS 8.8 · EPSS 87.6%

Identify the affected asset

Confirm whether Cisco Adaptive Security Appliance (ASA) is installed, record the deployed version and installation path, and identify exposed interfaces.

Record the product name, package or appliance identifier, and installed version.
Identify internet-facing, administrative, API, and internal access paths.
Preserve the pre-change configuration and relevant service logs.

Validate the affected-version match

Compare the deployed version with the affected range: >= 7.2.1 < 9.0.4.40, >= 9.1.1 < 9.1.7\(9\), >= 9.2.0 < 9.2.4\(14\), >= 9.3.0 < 9.3.3\(10\), >= 9.4.0.115 < 9.4.3\(8\), >= 9.5.0 <= 9.5\(3\), >= 9.6.0 < 9.6.1\(11\), 8.7.1, 8.7.1.1. Treat incomplete inventory results as unresolved.

Prioritize with independent signals

CISA has listed this vulnerability in the Known Exploited Vulnerabilities catalog. Combine this signal with asset criticality, exposure, compensating controls, and business impact.

Apply supported remediation

Apply updates per vendor instructions.

Verify the result

Confirm the resulting version, service health, authentication and access paths, monitoring coverage, and relevant security logs.

Confirm the expected version and package state.
Run a functional health check for critical service paths.
Review authentication, error, application, and security monitoring logs.
Reassess exposure if the supported fix cannot be applied.

Operational boundary

This page does not replace the vendor advisory, support contract, change-management process, or recovery plan. Do not infer that an asset is unaffected from an incomplete inventory query or a missing fixed-version field.