CVE‑2016‑6366: Cisco ASA SNMP Buffer Overflow – Remote Code Execution Risk
What It Is – A buffer overflow in the SNMP processing code of Cisco Adaptive Security Appliance (ASA) software can be triggered by a crafted SNMP packet. Successful exploitation may cause the appliance to reload or execute arbitrary code with root privileges.
Exploitability – Publicly disclosed; proof‑of‑concept packets exist. The vulnerability is rated High (CVSS v3.1 ≈ 7.5). No known active exploit campaigns, but the attack vector is network‑visible on any reachable SNMP service.
Affected Products – Cisco ASA 9.1‑9.6 (all releases that include the vulnerable SNMP daemon).
Why It Matters for Trust & Control Assurance
- Vulnerability Management – Demonstrates the need for continuous monitoring of vendor‑issued advisories and rapid patch deployment to satisfy the control objective of maintaining an effective vulnerability remediation process.
- Audit Evidence – Organizations must retain verifiable evidence (patch status, remediation tickets) to prove due diligence during third‑party risk assessments and compliance audits.
- Enterprise Buyer Expectations – Buyers increasingly demand proof that critical network devices are patched promptly, linking this to a defensible trust posture across frameworks (e.g., NIST CSF Identify ID‑RA‑1).
Recommended Actions
- Verify ASA firmware version against Cisco’s advisory and apply the security patch released in March 2017 or later.
- Disable SNMP on ASA if not required, or restrict access to trusted management hosts via ACLs.
- Update your vulnerability management program to ingest CISA KEV feeds automatically and map remediation to the “Vulnerability Management” control objective.
- Document remediation steps and retain logs as audit evidence for continuous control assurance.
Source: CISA KEV – CVE‑2016‑6366