CVE-2016-6366: in the CISA KEV catalogue
Cisco Adaptive Security Appliance (ASA) SNMP Buffer Overflow Vulnerability. CISA added CVE-2016-6366 to the Known Exploited Vulnerabilities catalogue on 2022-05-24 with a default due date of 2022-06-14. Known ransomware campaign use: Unknown. Forensic triage flag: No.
A buffer overflow vulnerability in the Simple Network Management Protocol (SNMP) code of Cisco ASA software could allow an attacker to cause a reload of the affected system or to remotely execute code. (CISA description)
- Vendor / product
- Cisco Adaptive Security Appliance (ASA)
- CWE
- CWE-119
- CISA required action
- Apply updates per vendor instructions.
- EPSS
- 88%, percentile 99 (scored 2026-11-04)
EPSS puts about 88 in 100 odds (88%) on exploitation activity being observed in the next 30 days. Its score is higher than or equal to that of 99% of scored CVEs. This is a model estimate about exploitation anywhere, not about your environment.
Vendor and reference links (from CISA)
Your own deadline under CISA BOD 26-04 depends on exposure, automatability and technical impact: work it out with the BOD 26-04 calculator.
Frequently asked questions
Is CVE-2016-6366 in the CISA KEV catalogue?
Yes. CISA added CVE-2016-6366 (Cisco Adaptive Security Appliance (ASA) SNMP Buffer Overflow Vulnerability) to the Known Exploited Vulnerabilities catalogue on 2022-05-24. CISA's default due date for it is 2022-06-14.
Is CVE-2016-6366 used in ransomware attacks?
CISA marks known ransomware campaign use as Unknown for CVE-2016-6366. That means CISA lacks confirmation, not that ransomware groups do not use it.
What should I do about CVE-2016-6366?
CISA's required action: Apply updates per vendor instructions.
Sources
- CISA, Known Exploited Vulnerabilities Catalog (accessed 2026-11-03)
- FIRST, Exploit Prediction Scoring System (EPSS) (EPSS by FIRST; scores generated by Empirical Security)
- NVD record for CVE-2016-6366