Quick answers
- Is CVE-2025-65865 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2025-65865 being exploited in the wild.
- How severe is CVE-2025-65865?
- High severity, with a CVSS score of 7.5, published 23 December 2025.
- Which products and versions are affected?
- Eprosima Fast Dds 3.3.0.
- Is there a fix for CVE-2025-65865?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2025-65865 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2025-65865?
- Check whether you run Eprosima Fast Dds at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
An integer overflow vulnerability exists in eProsima Fast-DDS v3.3 within the processing of RTPS protocol DataFrag sub-messages. Specifically, the `proc_Submsg_DataFrag` function in `MessageReceiver.cpp` suffers from an integer underflow when `submessageLength` is smaller than the combined `octetsToInlineQos` and `inlineQosSize`. This results in an extremely large `payload_size` value, leading to an out-of-bounds access for the `msg->pos` pointer. Consequently, a subsequent `memcpy` operation in the `add_fragments` function attempts to copy excessive data, causing a segmentation fault or potential arbitrary memory read. Attackers can exploit this over UDP if they can monitor the target's GUID and entityId.
Affected products
- eProsima Fast-DDS 3.3.0
Timeline
- 2025-12-23: disclosed: Initial vulnerability disclosure and CVE assignment.