What’s Vulnerable › Vulnerabilities

CVE-2023-39949: Improper validation of sequence numbers leading to remotely reachable assertion failure

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-08-11 · updated 2026-06-17
• Weakness: CWE-617

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.

Affected products

• Debian Linux: 11.0, 12.0
• eProsima Fast-DDS: from 2.6.0 before 2.6.5; 2.9.0 — fixed in 2.6.5

How to fix

Upgrade to a fixed version: eProsima Fast-DDS 2.6.5. Check the vendor advisory for mitigations.

References

• https://github.com/eProsima/Fast-DDS/blob/v2.9.0/src/cpp/rtps/messages/MessageReceiver.cpp#L1059
• https://github.com/eProsima/Fast-DDS/issues/3236
• https://github.com/eProsima/Fast-DDS/security/advisories/GHSA-3jv9-j9x3-95cg
• https://www.debian.org/security/2023/dsa-5481
• https://github.com/eProsima/Fast-DDS/blob/v2.9.0/src/cpp/rtps/messages/MessageReceiver.cpp#L1059
• https://github.com/eProsima/Fast-DDS/issues/3236
• https://github.com/eProsima/Fast-DDS/security/advisories/GHSA-3jv9-j9x3-95cg
• https://www.debian.org/security/2023/dsa-5481

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