CVE-2019-6256 Denial of service in n/a

What is CVE-2019-6256?

CVE-2019-6256 is a critical denial of service vulnerability in Debian Debian Linux, published on 14 Jan 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A Denial of Service issue was discovered in the LIVE555 Streaming Media libraries as used in Live555 Media Server 0.93. It can cause an RTSPServer crash in handleHTTPCmd_TunnelingPOST, when RTSP-over-HTTP tunneling is supported, via x-sessioncookie HTTP headers in a GET request and a POST request within the same TCP session. This occurs because of a call to an incorrect virtual function pointer in the readSocket function in GroupsockHelper.cpp.

Weakness: CWE-755

Which versions are affected by CVE-2019-6256?

It affects 2 products.

Products include Debian Debian Linux, Live555 Live555 Media Server.

How do I fix CVE-2019-6256?

Upgrade to a fixed version.

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-2019-6256 being exploited?

There is no known exploitation of CVE-2019-6256 in the wild and no public exploit code.

Other vulnerabilities in Debian Debian Linux

• CVE-2015-3306 ProFTPD Improper Access Control Exploited Critical 10.0
• CVE-2025-49113 RoundCube Webmail Deserialization of Untrusted Data Exploited Critical 9.9
• CVE-2026-24061 GNU InetUtils Argument Injection Exploited Critical 9.8
• CVE-2025-39682 Linux Kernel Improper Check for Unusual or Exceptional Conditions Exploited Critical 9.8
• CVE-2024-9680 Mozilla Firefox Use-After-Free Exploited Critical 9.8

All Debian Debian Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2019-6256, GHSA-j293-2f59-6wr3, UBUNTU-CVE-2019-6256.