What it is
CVE-2016-6366 is a vulnerability affecting Cisco Adaptive Security Appliance (ASA) Software. Buffer overflow in Cisco Adaptive Security Appliance (ASA) Software through 9.4.2.3 on ASA 5500, ASA 5500-X, ASA Services...
Vulnerability report
Exploited in the wild
Confirmed confidence
In CISA KEV
CVE-2016-6366
Adaptive Security Appliance (ASA) Software
Cisco / Adaptive Security Appliance (ASA) Software
- Severity
- CVSS 8.8 · High
- Confidence
- Confirmed
- Exploit status
- Exploited in the wild
- EPSS
- 87.6%
- First observed
- —
- Last observed
- —
Decision summary
What security teams need to know first
Direct answers before the deeper technical record.
Is it exploited?
Yes. KEV Intelligence tracks this CVE as a known exploited vulnerability. Confidence is confirmed.
Who is affected?
Cisco / Adaptive Security Appliance (ASA) Software.
What should we do?
Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
Overview
Adaptive Security Appliance (ASA) Software
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.
- Published
- 18 Aug 2016
- Exploitation Reported
- 24 May 2022
- Attack vector
- Remote
- Complexity
- Low
- Privileges
- Low
- User interaction
- None
Tags
edge
cisa
CVE References
- CVE Record CVE.org · CVE Record https://www.cve.org/CVERecord?id=CVE-2016-6366
- 20160817 Cisco Adaptive Security Appliance SNMP Remote Code Execution Vulnerability tools.cisco.com · Vendor Advisory http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/...
- 40258 exploit-db.com · Exploit https://www.exploit-db.com/exploits/40258/
- 92521 securityfocus.com · VDB Entry http://www.securityfocus.com/bid/92521
- 1036637 securitytracker.com · VDB Entry http://www.securitytracker.com/id/1036637
- GitHub — offensive-security/exploit-database-bin-sploits github.com · CVE Record https://github.com/offensive-security/exploit-database-bin-sploits/ra...
- blogs.cisco.com/security/shadow-brokers blogs.cisco.com · CVE Record http://blogs.cisco.com/security/shadow-brokers
- tools.cisco.com/security/center/viewErp.x tools.cisco.com · CVE Record http://tools.cisco.com/security/center/viewErp.x?alertId=ERP-56516
- zerosum0x0.blogspot.com/2016/09/reverse-engineering-cisco-asa-for.html zerosum0x0.blogspot.com · CVE Record https://zerosum0x0.blogspot.com/2016/09/reverse-engineering-cisco-asa...
Exploitation evidence
Why KEV Intelligence marks this CVE as exploited
Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.
Exploited in the wild
CISA
Independent exploitation attestation added to the KEV Intelligence record.
Known exploited vulnerability sources
Per-source evidence links for KEV attestations are available through the KEV Intelligence Pro API.
Learn about Pro API access| Source | Added |
|---|---|
| CISA First | 2022-05-24 00:00 UTC |
Detection
Operational artifacts and observed signals
Make the evidence actionable in scanner, SOC, and edge-control workflows.
Observed signals
- Request targets
- 0
- User-Agents
- 0
Raw values available in Pro and Enterprise.
Scanner coverage
No scanner integrations recorded yet.
Virtual patch status
No KEV Intelligence virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.
Learn about virtual patches →No detection artifacts or sensor request patterns are available for this CVE yet.
Check back as sensor telemetry and scanner integrations are updated.
Risk and context
Severity, weaknesses, and research context
CVSS v3.1
8.8
High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS
87.6%
All CVSS Scores
CVSS v3.1
8.8
High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS v2.0
8.5
High
AV:N/AC:M/Au:S/C:C/I:C/A:C
Timeline
From disclosure to observed exploitation
-
Added to CISA KEV
Listed in the CISA Known Exploited Vulnerabilities catalog
-
CVE published
Vulnerability disclosed publicly
-
CVE ID reserved
Identifier reserved by the CNA
Pro API
Automate this intelligence
Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.
- Evidence confidence and provenance
- First-party sensor telemetry
- PoC and scanner references
- Affected versions and enrichment
- Automation-ready JSON delivery
GET /api/v2/pro/kevs/CVE-2016-6366
Free JSON includes basic KEV fields{
"cve_id": "CVE-2016-6366",
"confidence": "Confirmed",
"cvss_score": 8.8,
"cvss_estimated": false,
"epss_score": 0.87565,
"exploit_status": {
"exploited_in_the_wild": true,
"active_exploitation_observed": false
},
"sensor_telemetry": { "attempts": 0, "sensors": 0 }
}Early warning alerts
Get alerts on high-impact exploitation
Receive curator-selected alerts when exploitation activity warrants attention. Each alert includes the evidence and context needed to decide what requires attention now.