CVE-2016-6366
Cisco Adaptive Security Appliance (ASA) SNMP Buffer Overflow Vulnerability
Does this matter?
Known to be exploited in the wild (CISA KEV, CISA remediation deadline 14 June 2022). Treat as an emergency change: patch or isolate now, then hunt for prior compromise.
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.
- CVSS 3.1
- 8.8 HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 87.56% probability · 100th percentile
- Public exploits
- 1 in Exploit-DB · first 18 August 2016
- CISA KEV
- Listed 24 May 2022 · due 14 June 2022
- Weakness
- CWE-120
- Affected
- cisco/pix firewall software · cisco/adaptive security appliance software · cisco/asa 1000v cloud firewall software
- Source
- psirt@cisco.com
EPSS 87.6% since 30 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
CISA notes
Apply updates per vendor instructions. https://nvd.nist.gov/vuln/detail/CVE-2016-6366
Public exploits (1)
Entries in Exploit-DB that cite this CVE. Links go to the Exploit-DB page and to the file in the public repository; nothing is hosted here. A verified tick means the Exploit-DB team confirmed the exploit works against the stated version.
References
- http://blogs.cisco.com/security/shadow-brokersExploit, Press/Media Coverage, Vendor Advisory
- http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160817-asa-snmpVendor Advisory
- http://tools.cisco.com/security/center/viewErp.x?alertId=ERP-56516Vendor Advisory
- http://www.securityfocus.com/bid/92521Broken Link, Not Applicable, Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1036637Broken Link, Third Party Advisory, VDB Entry
- https://github.com/offensive-security/exploit-database-bin-sploits/raw/master/sploits/40258.zipBroken 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.htmlExploit, Technical Description
- http://blogs.cisco.com/security/shadow-brokersExploit, Press/Media Coverage, Vendor Advisory
- http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160817-asa-snmpVendor Advisory
- http://tools.cisco.com/security/center/viewErp.x?alertId=ERP-56516Vendor Advisory
- http://www.securityfocus.com/bid/92521Broken Link, Not Applicable, Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1036637Broken Link, Third Party Advisory, VDB Entry
- https://github.com/offensive-security/exploit-database-bin-sploits/raw/master/sploits/40258.zipBroken 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.htmlExploit, Technical Description
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2016-6366US Government Resource
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.