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

CVE-2016-6366 · Severity: critical · CVSS 8.8 · Exploited in the wild · Published 2022-05-24

A buffer overflow vulnerability in the SNMP code of Cisco ASA software allows remote authenticated attackers to execute arbitrary code or cause a system reload via crafted IPv4 SNMP packets. The vulnerability, also known as EXTRABACON, affects multiple Cisco security platforms including ASA 5500, PIX, and Firepower modules.

Technologies: Cisco Adaptive Security Appliance (ASA), Cisco Firepower Threat Defense (FTD). Vendors: Cisco.

Quick answers

Is CVE-2016-6366 exploited in the wild?
Yes. CVE-2016-6366 is known to be exploited in the wild, first recorded on 24 May 2022. Treat it as urgent.
How severe is CVE-2016-6366?
Critical severity, with a CVSS score of 8.8, published 24 May 2022.
Which products and versions are affected?
Cisco Adaptive Security Appliance (ASA) Software through 9.4.2.3; Cisco ASA 5500 Series Adaptive Security Appliances; Cisco ASA 5500-X Series Next-Generation Firewalls; Cisco ASA Services Module; and 5 more.
Is there a fix for CVE-2016-6366?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2016-6366 attacked?
It is attacked over the network, in an operating system.
Am I affected by CVE-2016-6366?
Check whether you run Cisco Adaptive Security Appliance (ASA) or Cisco Firepower Threat Defense (FTD). Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Affected products

  • Cisco Adaptive Security Appliance (ASA) Software through 9.4.2.3
  • Cisco ASA 5500 Series Adaptive Security Appliances
  • Cisco ASA 5500-X Series Next-Generation Firewalls
  • Cisco ASA Services Module
  • Cisco ASA 1000V Cloud Firewall
  • Cisco ASAv
  • Cisco Firepower 9300 ASA Security Module
  • Cisco PIX Firewalls
  • Cisco Firewall Services Module (FWSM)

Timeline

  • 2016-08-17: advisory: Cisco Security Advisory published
  • 2022-05-24: kev added: Added to CISA Known Exploited Vulnerabilities Catalog
  • 2022-05-24: disclosed: NVD publication date

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