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.

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

Published 2026-02-03 · last modified 2026-06-17.

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.

EPSS exploit prediction

EPSS: 0.005 (44.8th percentile), scored 2026-10-20.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 45th percentile — 44.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: +0.000

Affected products

Eprosima Fast-Dds — versions 3.4.0, 3.0.0, 0
Eprosima Fast Dds — versions 3.4.0
Debian Linux — versions 11.0, 12.0, 13.0

Weakness classification (CWE)

References

security-tracker.debian.org/tracker/CVE-2025-62799 (Third Party Advisory)
github.com/eProsima/Fast-DDS/commit/d6dd58f4ecd28cd1c3bc4ef0467be9110fa94659 (Patch)
github.com/eProsima/Fast-DDS/commit/0c3824ef4991628de5dfba240669dc6172d63b46 (Patch)
github.com/eProsima/Fast-DDS/commit/955c8a15899dc6eb409e080fe7dc89e142d5a514 (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.