# CVE-2016-6368: Denial of service in Cisco Firepower Detection Engine > Remote attackers can cause a denial of service by sending crafted PGM packets to Cisco Firepower devices with file action policies enabled. - **Severity:** High 8.6 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H`) - **Exploited in the wild:** Not known - **Login needed:** Not needed - **Attackable:** Over the internet - **Victim action needed:** Not needed - **Fix available:** No - **Published:** 20 Apr 2017 - **Updated:** 6 Aug 2024 - **Also known as:** GHSA-pcq6-7678-76ww ## What is CVE-2016-6368? CVE-2016-6368 is a high-severity denial of service vulnerability in Cisco Secure Firewall Management Center, published on 20 Apr 2017. An attacker can exploit it over the internet without logging in, with no action from the victim. ### Official description A vulnerability in the detection engine parsing of Pragmatic General Multicast (PGM) protocol packets for Cisco Firepower System Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition due to the Snort process unexpectedly restarting. The vulnerability is due to improper input validation of the fields in the PGM protocol packet. An attacker could exploit this vulnerability by sending a crafted PGM packet to the detection engine on the targeted device. An exploit could allow the attacker to cause a DoS condition if the Snort process restarts and traffic inspection is bypassed or traffic is dropped. This vulnerability affects Cisco Firepower System Software that has one or more file action policies configured and is running on any of the following Cisco products: Adaptive Security Appliance (ASA) 5500-X Series with FirePOWER Services; Adaptive Security Appliance (ASA) 5500-X Series Next-Generation Firewalls; Advanced Malware Protection (AMP) for Networks, 7000 Series Appliances; Advanced Malware Protection (AMP) for Networks, 8000 Series Appliances; Firepower 4100 Series Security Appliances; FirePOWER 7000 Series Appliances; FirePOWER 8000 Series Appliances; Firepower 9300 Series Security Appliances; FirePOWER Threat Defense for Integrated Services Routers (ISRs); Industrial Security Appliance 3000; Sourcefire 3D System Appliances; Virtual Next-Generation Intrusion Prevention System (NGIPSv) for VMware. Fixed versions: 5.4.0.10 5.4.1.9 6.0.1.3 6.1.0 6.2.0. Cisco Bug IDs: CSCuz00876. Weakness: CWE-399 ## Which versions are affected by CVE-2016-6368? It affects 1 product. Products: Cisco Secure Firewall Management Center. ## How do I fix CVE-2016-6368? No fix has been published for CVE-2016-6368 yet. Limit exposure of the affected software until one is available. ## Is CVE-2016-6368 being exploited? There is no known exploitation of CVE-2016-6368 in the wild and no public exploit code. ## Other vulnerabilities in Cisco Secure Firewall Management Center - [CVE-2026-20079](https://insights.sbomify.com/CVE-2026-20079/): Cisco Firewall Management Center Authentication Bypass Using an Alternate Path or Channel (critical 10.0, exploited in the wild) - [CVE-2026-20131](https://insights.sbomify.com/CVE-2026-20131/): Cisco Secure Firewall Management Center (FMC) Software and Cisco Security Cloud Control (SCC) Firewall Management Deserialization of Untrusted Data (critical 10.0, exploited in the wild) - [CVE-2026-20316](https://insights.sbomify.com/CVE-2026-20316/): Cisco Secure Firewall Management Center Use of Hard-coded Password (medium 5.3, exploited in the wild) - [CVE-2025-20265](https://insights.sbomify.com/CVE-2025-20265/): Cisco Secure Firewall Management Center Software Radius Remote Code Execution Vulnerability (critical 10.0) - [CVE-2024-20424](https://insights.sbomify.com/CVE-2024-20424/): Command injection in Cisco Firepower Management Center (critical 9.9) ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2016-6368 and fix it if it is affected. What it is: CVE-2016-6368 is a high-severity denial of service vulnerability in Cisco Secure Firewall Management Center, published on 20 Apr 2017. An attacker can exploit it over the internet without logging in, with no action from the victim. Exploitation: There is no known exploitation of CVE-2016-6368 in the wild and no public exploit code. Affected product: Cisco Secure Firewall Management Center. No package-level version data is available, so check the vendor advisory linked from the reference page. Task: 1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies. 2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it. 3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead. 4. Run the tests and summarise what changed and why. 5. If nothing in the project is affected, say so and change nothing. Reference: https://insights.sbomify.com/CVE-2016-6368/ (Markdown: https://insights.sbomify.com/CVE-2016-6368/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2016-6368 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2016-6368 - OSV: https://osv.dev/vulnerability/CVE-2016-6368 --- From sbomify Insights: https://insights.sbomify.com/CVE-2016-6368/ Summaries are generated and may contain mistakes; the official description above is the record.