--- title: "CVE-2016-6366: Buffer Copy without Checking Size of Input | CubePath" 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…" language: en source: https://cubepath.com/security/cve/CVE-2016-6366 --- # CVE-2016-6366: Buffer Copy without Checking Size of Input | CubePath ## 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. Official description from the CVE record, published by cisco. Copyright © 1999-2026 The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CVE license. [View the record on cve.org](https://www.cve.org/CVERecord?id=CVE-2016-6366) ## Key data ### CVSS 3.1 High 8.8 Score published by CISA-ADP in the CVE record. CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H | Metric | Value | What it means | | ---------------------- | --------- | ----------------------------------------------------------------------------------- | | Attack vector | Network | The vulnerable component can be reached over a network, possibly from the Internet. | | Attack complexity | Low | No special conditions are needed. The attack can be repeated at will. | | Privileges required | Low | A basic user account is needed. | | User interaction | None | No action from any user is needed. | | Scope | Unchanged | The impact stays within the vulnerable component. | | Confidentiality impact | High | Serious or total effect on the secrecy of data. | | Integrity impact | High | Serious or total effect on the trustworthiness of data. | | Availability impact | High | Serious or total effect on availability. | CVSS is owned and managed by FIRST.Org, Inc. (FIRST) and is used by permission. Each CVSS score on this site is shown together with its vector string, as published in the CVE record by the source named next to it. Learn more at [first.org/cvss](https://www.first.org/cvss/) . ### EPSS Exploit Prediction Scoring System by FIRST: an estimate of the probability that exploitation activity will be observed in the next 30 days. Score 0.87565 (87.6% probability) Percentile 99.8% Scores of Nov 10, 2026 Model v2026.06.15 ### CISA Known Exploited Vulnerabilities This CVE is listed in the CISA KEV catalog. Name in the catalog Cisco Adaptive Security Appliance (ASA) SNMP Buffer Overflow Vulnerability Added to the catalog May 24, 2022 Federal due date Jun 14, 2022 ### CISA assessment as of Nov 8, 2024 Stakeholder-Specific Vulnerability Categorization (SSVC) decision points added by CISA. Exploitation Recorded by CISA as active Automatable no Technical impact total ### Weakness (CWE) CWE catalog version 5.0. CWE names: Copyright © 2006-2026, The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CWE license. - [CWE-120](https://cwe.mitre.org/data/definitions/120.html) Buffer Copy without Checking Size of Input ## References Links listed in the CVE record. They lead to other sites, which CubePath does not control. - [92521](http://www.securityfocus.com/bid/92521) (securityfocus.com) vdb-entry - [github.com/offensive-security/exploit-database-bin-sploits/…](https://github.com/offensive-security/exploit-database-bin-sploits/raw/master/sploits/40258.zip) - [blogs.cisco.com/security/shadow-brokers](http://blogs.cisco.com/security/shadow-brokers) - [20160817 Cisco Adaptive Security Appliance SNMP Remote Code Execution Vulnerability](http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160817-asa-snmp) (tools.cisco.com) vendor-advisory - [tools.cisco.com/security/center/viewErp.x?alertId=ERP-56516](http://tools.cisco.com/security/center/viewErp.x?alertId=ERP-56516) - [zerosum0x0.blogspot.com/2016/09/reverse-engineering-cisco-a…](https://zerosum0x0.blogspot.com/2016/09/reverse-engineering-cisco-asa-for.html) - [40258](https://www.exploit-db.com/exploits/40258/) (exploit-db.com) exploit - [1036637](http://www.securitytracker.com/id/1036637) (securitytracker.com) vdb-entry ## Timeline 1. ID reserved Jul 26, 2016 2. Record published Aug 18, 2016 3. Added to CISA KEV May 24, 2022 4. Record last updated Jan 12, 2026 ## Look up another CVE ## About CubePath CubePath is a cloud provider with data centers in Europe and the United States. It offers VPS, bare metal servers and DDoS protection. [Cloud VPS](https://cubepath.com/vps) [DDoS protection](https://cubepath.com/ddos-protection) Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 19:29 UTC. [Sources and licenses](https://cubepath.com/security/cve/legal)