CVE-2019-1833 Cisco Firepower Threat Defense Software SSL/TLS Policy Bypass Vulnerability
Remote attackers can bypass SSL/TLS inspection policies in Cisco Firepower Threat Defense by sending malicious TLS messages, allowing uninspected traffic to pass.
- 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-2019-1833?
CVE-2019-1833 is a medium-severity vulnerability in Cisco Secure Firewall Management Center, published on 16 May 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability in the Secure Sockets Layer (SSL)/Transport Layer Security (TLS) protocol parser of Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to bypass configured policies. The vulnerability is due to improper parsing of specific attributes in a TLS packet header. An attacker could exploit this vulnerability by sending malicious TLS messages to the affected system. A successful exploit could allow the attacker to bypass the configured policies for the system, which could allow traffic to flow through without being inspected.
Weakness: CWE-693
Which versions are affected by CVE-2019-1833?
It affects 1 product.
Products include Cisco Secure Firewall Management Center.
How do I fix CVE-2019-1833?
No fix has been published for CVE-2019-1833 yet. Limit exposure of the affected software until one is available.
Is CVE-2019-1833 being exploited?
There is no known exploitation of CVE-2019-1833 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-6ffw-22x4-4x3r.