CVE-2016-6439 Denial of service in Cisco Firepower System Software before 6.0.1
Remote attackers can cause a denial of service in Cisco Firepower System Software by sending crafted HTTP packets, triggering a Snort process restart.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2016-6439?
CVE-2016-6439 is a high-severity denial of service vulnerability in Cisco Secure Firewall Management Center, published on 27 Oct 2016. 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 reassembly of HTTP packets for Cisco Firepower System Software before 6.0.1 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 handling of an HTTP packet stream. An attacker could exploit this vulnerability by sending a crafted HTTP packet stream 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.
Weakness: CWE-399
Which versions are affected by CVE-2016-6439?
It affects 1 product.
Products include Cisco Secure Firewall Management Center.
How do I fix CVE-2016-6439?
No fix has been published for CVE-2016-6439 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2016-6439 being exploited?
There is no known exploitation of CVE-2016-6439 in the wild and no public exploit code.
Other vulnerabilities in Cisco Secure Firewall Management Center
- CVE-2026-20079 Cisco Firewall Management Center Authentication Bypass Using an Alternate Path or Channel
- CVE-2026-20131 Cisco Secure Firewall Management Center (FMC) Software and Cisco Security Cloud Control (SCC) Firewall Management Deserialization of Untrusted Data
- CVE-2026-20316 Cisco Secure Firewall Management Center Use of Hard-coded Password
- CVE-2025-20265 Cisco Secure Firewall Management Center Software Radius Remote Code Execution Vulnerability
- CVE-2024-20424 Command injection in Cisco Firepower Management Center
Sources
Also known as GHSA-vh9x-xmvx-jwv7.