CVE-2016-6366 Cisco Adaptive Security Appliance (ASA) SNMP Buffer Overflow
Remote authenticated attackers can execute arbitrary code on Cisco ASA devices via crafted SNMP packets, requiring immediate patching.
- Exploited in the wild
- Since 24 May 2022
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2016-6366?
CVE-2016-6366 is a high-severity memory corruption vulnerability in Cisco Adaptive Security Appliance Software, published on 18 Aug 2016. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-120
Which versions are affected by CVE-2016-6366?
It affects 3 products.
Products include Cisco Adaptive Security Appliance Software, Cisco Asa 1000v Cloud Firewall Software, Cisco Pix Firewall Software.
How do I fix CVE-2016-6366?
No fix has been published for CVE-2016-6366 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 14 Jun 2022.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2016-6366 being exploited?
Yes. Attackers have exploited CVE-2016-6366 in the wild since at least 24 May 2022.
Public exploit code: 1 Metasploit module, 1 Exploit-DB entry and 1 proofs of concept on GitHub.
Other vulnerabilities in Cisco Adaptive Security Appliance Software
- CVE-2025-20333 Cisco Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) Buffer Overflow
- CVE-2026-20349 Cisco Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) Heap Inspection
- CVE-2024-20353 Cisco ASA and FTD Denial of Service
- CVE-2016-6367 Cisco Adaptive Security Appliance (ASA) CLI Remote Code Execution
- CVE-2020-3452 Cisco ASA and FTD Read-Only Path Traversal
All Cisco Adaptive Security Appliance Software vulnerabilities
Sources
Also known as GHSA-pfgh-2mw6-962h.