UpHeron
All vulnerabilities

Servers and applications

CVE-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 IPv4 SNMP packets, aka Bug ID CSCva92151 or EXTRABACON.

Actively exploited: CISA added it to its Known Exploited Vulnerabilities catalog on 24 May 2022.

Severity
High 8.8
Published
18 Aug 2016
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Fixed in
9.0.4.40, 9.1.7\(9\), 9.2.4\(14\), 9.3.3\(10\), 9.4.3\(8\), 9.6.1\(11\)
Exploit chance
88% in the next 30 daysHigher than 99% of CVEs. EPSS by FIRST, 11 Nov 2026
Weakness
Buffer overflow (CWE-120)
Attack
Over the network · Needs a user account · No user action needed
Attacker can
Read data · Change data · Take it down
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Sources
NVD

Affected software

SoftwareAffected versions
Cisco ASA and Firepower Threat DefenseServers and applications · cpe:o:cisco:adaptive_security_appliance_software
  • From 9.6.0 before 9.6.1\(11\)
  • From 9.5.0 up to 9.5\(3\)
  • From 9.4.0.115 before 9.4.3\(8\)
  • From 9.3.0 before 9.3.3\(10\)
All 7 release lines
  • From 7.2.1 before 9.0.4.40
  • From 9.1.1 before 9.1.7\(9\)
  • From 9.2.0 before 9.2.4\(14\)
  • From 9.3.0 before 9.3.3\(10\)
  • From 9.4.0.115 before 9.4.3\(8\)
  • From 9.5.0 up to 9.5\(3\)
  • From 9.6.0 before 9.6.1\(11\)

Known exploited

CISA name
Cisco Adaptive Security Appliance (ASA) SNMP Buffer Overflow Vulnerability
Required action
Apply updates per vendor instructions.
Due for US agencies
14 Jun 2022
Used in ransomware
Not known

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2016-6366
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2016-6366