CVE-2025-64438: Fast-DDS: Unbounded GAP range triggers OOM DoS under RELIABLE QoS
Fast DDS is a C++ implementation of the DDS (Data Distribution Service) standard of the OMG (Object Management Group ). Prior to versions 3.4.1, 3.3.1, and 2.6.11, a remotely triggerable Out-of-Memory (OOM) denial-of-service exists in Fast -DDS when processing RTPS GAP submessages under RELIABLE QoS. By sending a tiny GAP packet with a huge gap range (gapList .base - gapStart), an attacker drives StatefulReader::processGapMsg() into an unbounded loop that inserts millions of s equence numbers into WriterProxy::changesreceived (std::set), causing multi-GB heap growth and process termination. No authentication is required beyond network reachability to the reader on the DDS domain. In environments without an RSS limit (non-ASan / unlimited), memory consumption was observed to rise to ~64 GB. Versions 3.4.1, 3.3.1, and 2.6.11 patch t he issue.
Affected Software
Remediation
Event History
Frequently Asked Questions
What is the severity of CVE-2025-64438?
CVE-2025-64438 has been classified as a denial-of-service vulnerability due to an unbounded GAP range that can trigger an Out-of-Memory condition.
How do I fix CVE-2025-64438?
To remediate CVE-2025-64438, upgrade Fast DDS to version 3.4.1 or later, 3.3.1 or later, or 2.6.11 or later.
What software is affected by CVE-2025-64438?
CVE-2025-64438 affects versions of eProsima Fast DDS prior to 2.6.11, 3.3.1, and 3.4.1, as well as specific Debian package versions.
What type of attack is associated with CVE-2025-64438?
CVE-2025-64438 is associated with a denial-of-service attack that can be triggered remotely due to an unbounded GAP range.
Can CVE-2025-64438 be exploited remotely?
Yes, CVE-2025-64438 can be exploited remotely, leading to a denial-of-service situation through an Out-of-Memory error.