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

> CVE-2016-6366: Cisco Adaptive Security Appliance (ASA) SNMP Buffer Overflow Vulnerability. CVSS 8.8 (CVSS 3.1), in CISA KEV.

Canonical: https://rewindex.com/cve/CVE-2016-6366
Last updated: 2026-01-12T20:50:50Z

- Published: 2016-08-18 18:00 UTC · Updated: 2026-01-12 20:50 UTC · Assigner: cisco
- CVSS: 8.8 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS: 87.6%, 100th percentile (scored 2026-10-25)
- CISA KEV: yes, added 2022-05-24, federal due date 2022-06-14, ransomware use: Unknown

## 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.

## CISA required action

Apply updates per vendor instructions.

## Affected vendors and products

- Cisco: Adaptive Security Appliance (ASA)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2016-6366)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2016-6366)
- [http://blogs.cisco.com/security/shadow-brokers](http://blogs.cisco.com/security/shadow-brokers)
- [https://github.com/offensive-security/exploit-database-bin-sploits/raw/master/sploits/40258.zip](https://github.com/offensive-security/exploit-database-bin-sploits/raw/master/sploits/40258.zip)
- [https://www.exploit-db.com/exploits/40258/](https://www.exploit-db.com/exploits/40258/)
- [https://zerosum0x0.blogspot.com/2016/09/reverse-engineering-cisco-asa-for.html](https://zerosum0x0.blogspot.com/2016/09/reverse-engineering-cisco-asa-for.html)
- [http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160817-asa-snmp](http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160817-asa-snmp)
- [http://tools.cisco.com/security/center/viewErp.x?alertId=ERP-56516](http://tools.cisco.com/security/center/viewErp.x?alertId=ERP-56516)
- [http://www.securityfocus.com/bid/92521](http://www.securityfocus.com/bid/92521)
- [http://www.securitytracker.com/id/1036637](http://www.securitytracker.com/id/1036637)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2016-6366 · Markdown: https://rewindex.com/cve/CVE-2016-6366.md · JSON: https://rewindex.com/api/v1/cves/CVE-2016-6366 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:01:03.885Z