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CISA KEV·Added 2022-05-24 — agencies required to remediate by 2022-06-14

CVE-2016-6366

HIGH

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,…

Published
Aug 18, 2016
Updated
Apr 22, 2026
Affected
0 pkgs
Patched
None yet
Exploits
9 known

EPSS Exploitation Probability

via FIRST.org ↗
90.8%probability of exploitation in next 30 days
Very High Risk100th percentile0.00%
90.3%90.9%91.5%92.0%91.5%90.8%Dec 25Apr 26Jun 26

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

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.

Affected Products

3 products · 10 configurations
OS
adaptive security appliance softwarecisco
≥ 9.6.0 && ≤ 9.5\(3\)
range
OS
asa 1000v cloud firewall softwarecisco
2 versions
8.7.18.7.1.1
OS
pix firewall softwarecisco
all
Exploits & PoCs
9

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

EDB-40258remotehardware

Cisco ASA 8.x - 'EXTRABACON' Authentication Bypass

by Shadow Brokers · Aug 18, 2016

Frequently Asked Questions

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.
O3 Security · Impact-Aware SCA

Is CVE-2016-6366 in your stack?

O3 detects CVE-2016-6366 across dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.