Buffer overflow in Eprosima Fast-Dds
CVE-2025-62799
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 heap buffer overflow exists in the Fast-DDS DATA_FRAG receive path. An un authenticated sender can transmit a single malformed RTPS DATA_FRAG packet where `fragmentSize` and `sampleSize` are craft ed to violate internal assumptions. Due to a 4-byte alignment step during fragment metadata initialization, the code write s past the end of the allocated payload buffer, causing immediate crash (DoS) and potentially enabling memory corruption ( RCE risk). Versions 3.4.1, 3.3.1, and 2.6.11 patch the issue.
Vulnerability class: Buffer Overflow
EPSS: 0.005 (41.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Eprosima Fast-dds — versions 3.4.0, 3.0.0, 0
- Eprosima Fast_dds — versions 3.4.0
- Debian Debian_linux — versions 11.0, 12.0, 13.0
Weakness classification (CWE)
References
- security-advisories@github.com (Third Party Advisory)
- security-advisories@github.com (Patch)
- security-advisories@github.com (Patch)
- security-advisories@github.com (Patch)
Frequently asked questions
- What is CVE-2025-62799?
- CVE-2025-62799 is a critical-severity vulnerability in Eprosima Fast-Dds, classified under Heap-based Buffer Overflow. CVSS score: 9.8/10. Published 2026-02-03.
- How severe is CVE-2025-62799?
- Critical severity. CVSS v3 base score is 9.8 out of 10.