CVE-2025-62799 in Fast-DDS
Summary
by MITRE • 02/03/2026
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.
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Analysis
by VulDB Data Team • 02/18/2026
The vulnerability identified as CVE-2025-62799 affects Fast DDS, a popular C++ implementation of the Data Distribution Service (DDS) standard developed by the Object Management Group. This middleware is widely deployed in real-time systems for distributed data exchange, particularly in automotive, aerospace, and industrial automation environments where reliable communication between distributed components is critical. The flaw exists in versions prior to 3.4.1, 3.3.1, and 2.6.11, making a substantial portion of deployed Fast DDS implementations susceptible to exploitation. The vulnerability specifically targets the DATA_FRAG receive path within the Real-Time Publish-Subscribe (RTPS) protocol implementation, which handles fragmented data packets that are essential for transmitting large data samples across networks.
The technical root cause of this heap buffer overflow stems from improper validation of fragment metadata during the processing of RTPS DATA_FRAG packets. An attacker can craft a single malformed packet where both `fragmentSize` and `sampleSize` parameters are carefully manipulated to exceed internal buffer boundaries. The vulnerability manifests during a 4-byte alignment operation that occurs during fragment metadata initialization, where the code performs calculations that result in writing beyond the allocated payload buffer boundaries. This alignment step, while intended to optimize memory access patterns, creates a condition where the buffer overflow occurs during the initialization phase rather than during data processing, making it particularly insidious as it can be triggered early in the packet handling lifecycle. The flaw represents a classic buffer overflow vulnerability that violates the principle of proper bounds checking in memory management operations.
The operational impact of this vulnerability extends beyond simple denial of service to potentially enabling remote code execution, making it a critical security concern for systems relying on Fast DDS for data distribution. The immediate effect is an application crash that can be exploited for denial of service attacks against critical infrastructure components that depend on DDS for real-time communication. However, the more severe implication arises from the potential for memory corruption that could allow an attacker to execute arbitrary code on the target system. This risk is particularly concerning in environments where Fast DDS operates in security-sensitive contexts such as autonomous vehicles, industrial control systems, or defense applications where system compromise could lead to catastrophic consequences. The vulnerability affects systems where Fast DDS is deployed as a standalone middleware or integrated into larger distributed applications, potentially impacting multiple layers of the communication stack.
Mitigation strategies for CVE-2025-62799 should prioritize immediate patching of affected systems to versions 3.4.1, 3.3.1, or 2.6.11, which contain the necessary code modifications to prevent the buffer overflow condition. Organizations should conduct comprehensive inventory assessments to identify all systems running vulnerable versions of Fast DDS, particularly those in operational environments where the risk of exploitation is highest. Network segmentation and access controls should be implemented to limit the ability of unauthenticated attackers to reach systems processing DDS traffic, as the vulnerability can be exploited without authentication. Additionally, monitoring systems should be enhanced to detect anomalous RTPS traffic patterns that might indicate exploitation attempts, particularly focusing on malformed DATA_FRAG packets with suspicious fragment size parameters. This vulnerability aligns with CWE-121, heap-based buffer overflow, and represents a potential ATT&CK technique for initial access and privilege escalation through remote code execution capabilities. Organizations should also consider implementing intrusion detection systems specifically tuned to identify the signature patterns associated with this vulnerability to provide proactive defense against exploitation attempts.