Public proof of conceptFix available

CVE-2023-39949

Q: Is CVE-2023-39949 actively exploited?

A proof-of-concept exploit exists for CVE-2023-39949, but active exploitation has not been confirmed at this time.

Q: What is the CVSS score for CVE-2023-39949?

CVE-2023-39949 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

A public proof of concept exists; no exploitation attested.

Published2023-08-11
WeaknessCWE-617

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

eprosima Fast DDS is a C++ implementation of the Data Distribution Service standard of the Object Management Group. Prior to versions 2.9.1 and 2.6.5, improper validation of sequence numbers may lead to remotely reachable assertion failure. This can remotely crash any Fast-DDS process. Versions 2.9.1 and 2.6.5 contain a patch for this issue.

Timeline

dates in UTC

2023-08-1114:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2023-39949?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2023-39949?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Debian debian linux

Branch	Affected	Fixed in	Source
11.0	= 11.0	no fix published	NVD
12.0	= 12.0	no fix published	NVD

Eprosima fast dds

Branch	Affected	Fixed in	Source
2.6	≥ 2.6.0, < 2.6.5	2.6.5	NVD
2.9	= 2.9.0	no fix published	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

No fix published by the sources we read yet. NVD record

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

CISA-ADPSSVC decisionpoc2024-10-09
OpenCVESSVC decisionpoc—
CNACVSS 3.17.5read 2026-10-23
NVDCVSS 3.17.5read 2026-10-23
CNAweakness (CWE)CWE-617read 2026-10-23
FIRST EPSSEPSS score1.0 %2026-10-22

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: 2023-08-11
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2023-39949?

Is CVE-2023-39949 actively exploited?

A proof-of-concept exploit exists for CVE-2023-39949, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2023-39949?

CVE-2023-39949 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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