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Vulnerabilities

Vulnerability · CVE-2016-6366

Cisco Adaptive Security Appliance (ASA) SNMP Buffer Overflow Vulnerability

Published Aug 15, 2016 · catalog updated Jun 16, 2026 · Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD)

Patch now

CVE-2016-6366 is in the CISA known-exploited catalog, due Jun 14, 2022. Confirm Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD) against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Severity
High8.8
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
87.56%
Remediation
Remediation guidance
Affected products
cpe cisco/adaptive security appliance software · cpe cisco/asa 1000v cloud firewall software · cpe cisco/pix firewall software · vendor Cisco Adaptive Security Appliance (ASA) · vendor Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD)

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe cisco/adaptive security appliance softwareversion unspecified
  • cpe cisco/asa 1000v cloud firewall software8.7.1
  • cpe cisco/pix firewall softwareversion unspecified
  • vendor Cisco Adaptive Security Appliance (ASA)version unspecified
  • vendor Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD)version unspecified

How to fix CVE-2016-6366

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2016-6366 is in the CISA known-exploited catalog, due Jun 14, 2022. Confirm Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD) against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Compare what you have installed with cisco/asa 1000v cloud firewall software 8.7.1. Apply updates per vendor instructions.

What should an analyst verify?

CWE-119: Buffer Overflow; CWE-120: Classic Buffer Overflow. EPSS 87.56%. The CISA KEV listing is the exploitation evidence. A public exploit reference is linked in Sources. That is not the same as confirmed exploitation. Use the source links for the original advisory.

Technology hubs

Cisco security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Aug 18, 2016 · Catalog

    Detected

    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.

  2. May 24, 2022 · CISA KEV

    Known exploited

    Apply updates per vendor instructions.

  3. Jun 14, 2022 · CISA KEV

    Remediation due

    Apply updates per vendor instructions.

  4. Jun 16, 2026 · Catalog

    Updated

    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.

Sources

  • CISA KEVConfirmed exploitationCVE-2016-6366

    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.gov
  • CVE.orgVulnerability recordCVE-2016-6366

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2016-6366

    30-day exploitation probability 87.6%

    first.org
  • Exploit DatabasePublic exploit reference40258

    Public archive entry. The exploit body is not stored here.

    exploit-db.com
  • Metasploit ModulesPublic exploit moduleauxiliary_admin/networking/cisco_asa_extrabacon

    Public module reference (normal). Module source is not copied into this catalog.

    rapid7.com
  • NIST NVDVulnerability recordCVE-2016-6366

    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 IPv

    nvd.nist.gov
  • VulnCheck KEVConfirmed exploitationCVE-2016-6366

    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.

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 17, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.