CVE-2016-6366Buffer 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 de…
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It affects cisco pix_firewall_software and 2 other products. Add what you run to find out whether that includes you.
CISA lists it as known exploited since May 24, 2022; federal agencies had to remediate by Jun 14, 2022. Treat that date as your deadline.
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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.
- CVSS
- 8.8 HIGH (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-120
- Known exploited
- Added to CISA KEV May 24, 2022; federal remediation due Jun 14, 2022Apply updates per vendor instructions.
- EPSS (exploitation in the next 30 days)
- 87.56% (percentile 100)
- Assigned by
- cisco
- NVD analysis
- Analyzed
- Record last updated
- Jan 12, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
cisco pix_firewall_software cisco:pix_firewall_software | all versions | NVD |
cisco adaptive_security_appliance_software cisco:adaptive_security_appliance_software | from 7.2.1 before 9.0.4.40; from 9.1.1 before 9.1.7\(9\); from 9.2.0 before 9.2.4\(14\); from 9.3.0 before 9.3.3\(10\); from 9.4.0.115 before 9.4.3\(8\); from 9.5.0 through 9.5\(3\); from 9.6.0 before 9.6.1\(11\) | NVD |
cisco asa_1000v_cloud_firewall_software cisco:asa_1000v_cloud_firewall_software | 8.7.1; 8.7.1.1 | NVD |
References
- http://www.securityfocus.com/bid/92521vdb-entry, x-refsource-bid, broken-link, not-applicable, third-party-advisory
- https://github.com/offensive-security/exploit-database-bin-sploits/raw/master/sploits/40258.zipx-refsource-misc, broken-link, exploit
- http://blogs.cisco.com/security/shadow-brokersx-refsource-confirm, exploit, press/media-coverage, vendor-advisory
- http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160817-asa-snmpvendor-advisory, x-refsource-cisco
- http://tools.cisco.com/security/center/viewErp.x?alertId=ERP-56516x-refsource-confirm, vendor-advisory
- https://zerosum0x0.blogspot.com/2016/09/reverse-engineering-cisco-asa-for.htmlx-refsource-misc, exploit, technical-description
- https://www.exploit-db.com/exploits/40258/exploit, x-refsource-exploit-db, third-party-advisory, vdb-entry
- http://www.securitytracker.com/id/1036637vdb-entry, x-refsource-sectrack, broken-link, third-party-advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2016-6366us-government-resource
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.