CVE-2025-66969 in OpenModSim
Summary
by MITRE • 10/16/2026
Integer overflow in OpenModSim (<=1.11.0), leading to denial of service
Be aware that VulDB is the high quality source for vulnerability data.
Analysis
by VulDB Data Team • 10/16/2026
OpenModSim versions up to and including 1.11.0 contain a critical integer overflow vulnerability that poses a significant risk to system stability and availability. This flaw resides within the core simulation logic, specifically during the calculation or allocation of memory buffers required for processing complex mathematical operations inherent to physics simulations. When an attacker provides specially crafted input data containing values near the maximum limit of the signed 32-bit integer range, the arithmetic operation exceeds this boundary, causing the value to wrap around into a negative number or a significantly smaller positive number than intended by the application logic. This behavior is classified under CWE-190 as Integer Overflow or Wraparound and represents a classic memory safety issue often found in systems programming languages like C or C++, which are commonly used for high-performance simulation engines.
The operational impact of this vulnerability is primarily centered on denial of service, corresponding to the ATT&CK technique T1499 Endpoint Denial of Service. Because the overflow occurs during resource allocation or buffer sizing calculations, the application may attempt to allocate a massive amount of memory based on the wrapped negative value interpreted as a large unsigned integer, leading to immediate exhaustion of system resources. Alternatively, if the code handles the negative result directly, it may lead to out-of-bounds array access or invalid pointer dereferencing when attempting to write data to an incorrectly sized buffer. In either scenario, the simulation engine crashes abruptly, terminating the process and rendering the service unavailable to legitimate users who rely on OpenModSim for modeling tasks. This disruption can be triggered remotely if the input originates from a networked interface or locally through maliciously constructed project files, depending on how user inputs are ingested by the software.
Mitigation strategies must address both immediate remediation and long-term architectural improvements. The most effective solution is to upgrade OpenModSim to a version greater than 1.11.0 where this specific integer overflow has been patched with proper bounds checking before arithmetic operations occur. Developers should implement strict validation of all numerical inputs, ensuring that values do not exceed predefined thresholds prior to being used in calculations or memory allocation functions. Additionally, employing static analysis tools and fuzzing techniques during the development lifecycle can help identify similar vulnerabilities early. For environments where immediate patching is not feasible, deploying network-level controls such as input sanitization filters at the perimeter can block malformed packets containing extreme numerical values, thereby reducing the attack surface until a permanent fix is deployed in accordance with standard vulnerability management practices outlined by NIST SP 800-42 guidelines for information system security.