CVE-2023-39946: Heap overflow in push_back_helper due to a CDR message

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.9% 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-122

Description

eprosima Fast DDS is a C++ implementation of the Data Distribution Service standard of the Object Management Group. Prior to versions 2.11.1, 2.10.2, 2.9.2, and 2.6.6, heap can be overflowed by providing a PID_PROPERTY_LIST parameter that contains a CDR string with length larger than the size of actual content. In `eprosima::fastdds::dds::ParameterPropertyList_t::push_back_helper`, `memcpy` is called to first copy the octet'ized length and then to copy the data into `properties_.data`. At the second memcpy, both `data` and `size` can be controlled by anyone that sends the CDR string to the discovery multicast port. This can remotely crash any Fast-DDS process. Versions 2.11.1, 2.10.2, 2.9.2, and 2.6.6 contain a patch for this issue.

Affected products

Debian Linux: 11.0, 12.0
eProsima Fast-DDS: from 2.6.0 before 2.6.6; from 2.9.0 before 2.9.2; from 2.10.0 before 2.10.2; 2.11.0 — fixed in 2.10.2, 2.6.6, 2.9.2

How to fix

Upgrade to a fixed version: eProsima Fast-DDS 2.10.2, 2.6.6, 2.9.2. Check the vendor advisory for mitigations.

References

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