Overview
CVE-2025-63829 describes an infinite loop vulnerability affecting eProsima Fast-DDS versions 3.3 and earlier. This flaw stems from an integer overflow within the Time_t::fraction() function. Exploitation of this vulnerability can lead to a denial-of-service (DoS) condition, potentially halting critical systems relying on Fast-DDS for real-time data communication.
Technical Details
The vulnerability resides within the Time_t::fraction() function, as detailed in the Fast-DDS source code. An integer overflow occurs when the result of a calculation exceeds the maximum value that can be stored in the integer variable. In this case, a carefully crafted input can trigger this overflow, leading to an infinite loop within the function. The specific location within the code is:
// Relevant code snippet (approximate)
// From: https://github.com/eProsima/Fast-DDS/blob/master/src/cpp/fastdds/core/Time_t.cpp#L67 (This may vary slightly depending on specific patch level)
uint32_t Time_t::fraction() const
{
// Potentially vulnerable calculation
uint64_t temp = (uint64_t)seconds_ * 1000000000ULL; // Potential for overflow
return (uint32_t)(temp & 0xFFFFFFFF);
}
While the exact calculation might vary slightly across versions, the underlying principle of potential integer overflow remains consistent.
CVSS Analysis
Currently, the CVSS score for CVE-2025-63829 is N/A. This may be because the vulnerability is newly discovered, or the analysis is still in progress. However, due to the potential for a denial-of-service condition, it’s likely to receive a medium to high severity score once a CVSS score is assigned. Factors influencing the score will include attack complexity, required privileges, and the scope of the impact.
Possible Impact
The primary impact of CVE-2025-63829 is a denial-of-service (DoS). By exploiting the integer overflow and triggering the infinite loop, an attacker can cause the Fast-DDS process to consume excessive CPU resources, rendering it unresponsive. This can disrupt critical applications relying on Fast-DDS for real-time data exchange, such as:
- Robotics systems
- Autonomous vehicles
- Industrial control systems
- Financial trading platforms
The severity of the impact depends on the criticality of the affected systems and the availability of mitigation measures.
Mitigation or Patch Steps
The recommended mitigation is to upgrade to a patched version of eProsima Fast-DDS. Check the eProsima website and GitHub repository for the latest releases and security advisories. As of the publish date of this article, specific patched versions are not yet available, but it’s crucial to monitor the official channels for updates.
In the interim, consider the following temporary mitigation strategies (though these are not guaranteed to be effective in all cases):
- Input Validation: Implement strict input validation to sanitize data being processed by Fast-DDS. While this requires a deep understanding of the data structures, it can help prevent the specific input patterns that trigger the overflow.
- Resource Monitoring: Monitor the CPU and memory usage of Fast-DDS processes. If abnormal resource consumption is detected, investigate immediately and consider restarting the process to restore service.
- Network Segmentation: Isolate Fast-DDS deployments to reduce the potential attack surface.
Important: Applying a patch from eProsima is the most reliable solution. The temporary mitigations described above should only be considered as stop-gap measures until a patch is available and deployed.
