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

CISA Known Exploited Vulnerabilities

Name

Cisco Adaptive Security Appliance (ASA) SNMP Buffer Overflow Vulnerability

Vendor

Cisco

Product

Adaptive Security Appliance (ASA)

Added to the catalog

2022-05-24

Due date for US federal agencies

2022-06-14

Weaknesses

CWE-119

Catalog version

2026.10.30

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.

Required action (CISA)

Apply updates per vendor instructions.

Ransomware use: CISA does not mark known use of this vulnerability in ransomware campaigns.

Links in CISA's notes

• https://nvd.nist.gov/vuln/detail/CVE-2016-6366

Read on 2026-11-02T23:39:54.475Z under licence cisa-kev-cc0@b0067899 from https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json

NVD analysis

Status

Analyzed

Published

2016-08-18T18:59:00.117

Last modified

2026-06-17T00:50:54.163

Weaknesses

CWE-120

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.

References

• http://blogs.cisco.com/security/shadow-brokers (Exploit, Press/Media Coverage, Vendor Advisory)
• http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160817-asa-snmp (Vendor Advisory)
• http://tools.cisco.com/security/center/viewErp.x?alertId=ERP-56516 (Vendor Advisory)
• http://www.securityfocus.com/bid/92521 (Broken Link, Not Applicable, Third Party Advisory, VDB Entry)
• http://www.securitytracker.com/id/1036637 (Broken Link, Third Party Advisory, VDB Entry)
• https://github.com/offensive-security/exploit-database-bin-sploits/raw/master/sploits/40258.zip (Broken Link, Exploit)
• https://www.exploit-db.com/exploits/40258/ (Third Party Advisory, VDB Entry)
• https://zerosum0x0.blogspot.com/2016/09/reverse-engineering-cisco-asa-for.html (Exploit, Technical Description)
• http://blogs.cisco.com/security/shadow-brokers (Exploit, Press/Media Coverage, Vendor Advisory)
• http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160817-asa-snmp (Vendor Advisory)
• http://tools.cisco.com/security/center/viewErp.x?alertId=ERP-56516 (Vendor Advisory)
• http://www.securityfocus.com/bid/92521 (Broken Link, Not Applicable, Third Party Advisory, VDB Entry)
• http://www.securitytracker.com/id/1036637 (Broken Link, Third Party Advisory, VDB Entry)
• https://github.com/offensive-security/exploit-database-bin-sploits/raw/master/sploits/40258.zip (Broken Link, Exploit)
• https://www.exploit-db.com/exploits/40258/ (Third Party Advisory, VDB Entry)
• https://zerosum0x0.blogspot.com/2016/09/reverse-engineering-cisco-asa-for.html (Exploit, Technical Description)
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2016-6366 (US Government Resource)

This product uses the NVD API but is not endorsed or certified by the NVD.

Read on 2026-11-02T23:41:35.381Z under licence nvd-api-terms-of-use@ff2a5288 from https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2016-6366

CVE record

Assigner

cisco

State

PUBLISHED

Published

2016-08-18T18:00:00.000Z

Updated

2026-01-12T20:50:50.619Z

Problem types

n/a

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.

References

• 92521
• https://github.com/offensive-security/exploit-database-bin-sploits/raw/master/sploits/40258.zip
• http://blogs.cisco.com/security/shadow-brokers
• 20160817 Cisco Adaptive Security Appliance SNMP Remote Code Execution Vulnerability
• http://tools.cisco.com/security/center/viewErp.x?alertId=ERP-56516
• https://zerosum0x0.blogspot.com/2016/09/reverse-engineering-cisco-asa-for.html
• 40258
• 1036637

Read on 2026-11-03T00:33:58.145Z under licence cve-terms-of-use@81bfa2f3 from https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2016/6xxx/CVE-2016-6366.json

Defensive techniques (MITRE D3FEND)

D3FEND maps these defensive techniques to the weakness (CWE) that NVD lists for this CVE, through the digital artifacts the weakness affects. D3FEND does not say they stop this vulnerability.

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