CVE-2016-6366
Cisco Adaptive Security Appliance (ASA) SNMP Buffer Overflow Vulnerability
- High 8.8
- Exploited: added to CISA KEV 24 May 2022
- A public exploit reference is listed
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.
Key facts
- Published
- 18 Aug 2016
- Last changed
- 12 Jan 2026
- Assigned by
- cisco
- KEV added
- 24 May 2022
- KEV fix due
- 14 Jun 2022
- EPSS
- 87.565% likely to be exploited in the next 30 days, higher than 99.762% of CVEs (scores for 15 Nov 2026)
- SSVC (CISA)
- Exploitation: active; Automatable: no; Technical impact: total
Severity scores
Each score is shown as its source gave it. They are not averaged or merged.
- 8.8CVSS 3.1, Highfrom CISA (ADP container)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
What to do
- Apply updates per vendor instructions.CISA KEV required action
Historical context and remediation
This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.
No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.
Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.
Affected products
| Vendor | Product | Versions |
|---|---|---|
| n/a | n/a |
|
Timeline
- 18 Aug 2016 Published
- 24 May 2022 Added to the CISA KEV catalogue