Raw vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HCVSS and EPSS are reproduced from their sources (NVD, FIRST EPSS). Risk Priority is our own derived reading, not an NVD score.
Summary
CVE-2016-6366 is a high-severity Classic Buffer Overflow (CWE-120) vulnerability in Cisco Adaptive Security Appliance Software. Its CVSS base score is 8.8 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique NTDS (T1003.003); ranked in the top 0.2% of CVEs by exploit likelihood; CISA has added it to the Known Exploited Vulnerabilities catalog; a public proof-of-concept is referenced.
Deeper analysis AI-assisted summary
Synthesised by an AI model from the NVD description and linked references — a reading aid, not an authoritative source.
CVE-2016-6366 is a buffer overflow vulnerability, tracked as Bug ID CSCva92151 and also known as EXTRABACON, that affects Cisco Adaptive Security Appliance (ASA) Software through version 9.4.2.3. The flaw impacts multiple device families including ASA 5500, ASA 5500-X, ASA Services Module, ASA 1000V, ASAv, Firepower 9300 ASA Security Module, PIX, and FWSM when processing crafted IPv4 SNMP packets. It is classified under CWE-120 with a CVSS 3.1 base score of 8.8.
Remote authenticated users can exploit the issue over the network by sending specially crafted IPv4 SNMP packets, enabling them to execute arbitrary code on the affected device with high impact to confidentiality, integrity, and availability.
Cisco published Security Advisory cisco-sa-20160817-asa-snmp along with related ERP and blog posts discussing the Shadow Brokers disclosure that referenced this vulnerability; the references point to official mitigation guidance and patch availability for supported releases. The flaw gained additional attention due to its association with the EXTRABACON tool in the Shadow Brokers leak of purported NSA exploits.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2016-7289
Vulnerability Data
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…
more
crafted IPv4 SNMP packets, aka Bug ID CSCva92151 or EXTRABACON.
- CWE(s)
- KEV Date Added
- 24 May 2022
Related Threats
MITRE ATT&CK Enterprise Techniques
CVEs Like This One
Affected Assets
Mitigating Controls
Control response
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V5.2.1
Likely Mitigating Controls AI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Platform-independent managed code eliminates the need for unchecked native buffer copies that are the root cause of classic buffer overflows.
Mitigating Controls (NIST CSF 2.0) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.
Vulnerability identification processes such as code review or scanning detect classic buffer overflows before exploitation.
Routine patching replaces vulnerable code containing unchecked buffer copies with corrected versions.
Secure development practices directly enforce bounds checking and input validation that prevent classic buffer overflows.
Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.