Home/CVE/Cisco Adaptive Security Appliance (ASA) SNMP Buffer Overflow Vulnerability
CVE

CVE-2016-6366

Cisco Adaptive Security Appliance (ASA) SNMP Buffer Overflow Vulnerability

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.

HIGH · CVSS 8.8 ⚠ CISA KEV EPSS 0.90783
Act now
  • Listed on CISA KEV (known exploited in the wild)
  • SSVC exploitation status: active
  • EPSS ≥ 0.50 - high probability of exploitation in the next 30 days
  • EPSS percentile: top 0% of all CVEs by exploitation likelihood
  • Public exploit or PoC is available
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬢

Required Remediation

Apply updates per vendor instructions.

⬡

Weakness Classification

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
▤

Affected Products & Versions

9
cisco pix firewall softwareall versions
cisco adaptive security appliance software>= 7.2.1 and < 9.0.4.40
cisco adaptive security appliance software>= 9.1.1 and < 9.1.7\(9\)
cisco adaptive security appliance software>= 9.2.0 and < 9.2.4\(14\)
cisco adaptive security appliance software>= 9.3.0 and < 9.3.3\(10\)
cisco adaptive security appliance software>= 9.4.0.115 and < 9.4.3\(8\)
cisco adaptive security appliance software>= 9.5.0 and <= 9.5\(3\)
cisco adaptive security appliance software>= 9.6.0 and < 9.6.1\(11\)
⚠

Public Exploits & PoCs

5
remoteCisco ASA 8.x - 'EXTRABACON' Authentication Bypass2016-08-18
pocblogs.cisco.com · shadow-brokersblogs.cisco.com
pocgithub.com · 40258.zipgithub.com
pocwww.exploit-db.com · 40258www.exploit-db.com
poczerosum0x0.blogspot.com · reverse-engineering-cisco-asa-for.htmlzerosum0x0.blogspot.com
◈

Detection Rules (IDS/IPS)

1
et-openET EXPLOIT CISCO FIREWALL SNMP Buffer Overflow Extrabacon (CVE-2016-6366)misc-attack
Open rulesets (ET Open, Snort Community, abuse.ch) link to source. Commercial rulesets are reference-only.
▣

Scoring & Timeline

8.8
HIGH · CVSS v3.1 · psirt@cisco.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD18 Aug 2016 · 06:59 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC triage · cisa-vulnrichment
Exploitation
active
Automatable
no
Technical impact
total
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

1
cisaKEV-CVE-2016-6366
🔗

References & Sources

5
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160817-asa-snmpVendor Advisory
http://tools.cisco.com/security/center/viewErp.x?alertId=ERP-56516Vendor Advisory
http://www.securityfocus.com/bid/92521Broken LinkNot ApplicableThird Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1036637Broken LinkThird Party AdvisoryVDB Entry
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2016-6366US Government Resource
Intelligence Graph · click any node to traverse
CVETechnique ActorTool Family
drag to reposition · click any node to traverse · button top-right enlarges
External lookups - second-class, for what we don’t hold ourselves
NVDCVE.orgCISAVulnersExploit-DBGitHub PoCVulnCheck KEVGreyNoise
Vulnerabilities
CISA KEV catalog
CWE weaknesses
CAPEC attack patterns
Package vulnerabilities
Threat intelligence
Threat actors
Tools & malware
ATT&CK techniques
IOCs
Detection & defense
Sigma rules
YARA rules
Atomic Red Team tests
D3FEND countermeasures
Compliance
NIST 800-53
ISO 27001:2022
SOC 2 TSC
PCI-DSS v4.0
CIS Controls v8.1
About
All capabilities
Live statistics
Data sources
Privacy policy
Terms of service
threatengine.sh  ·  Open-source threat intelligence platform  ·  100+ authoritative sources  ·  Every fact traces to its origin