CVE-2025-7616

Vulnerability

Summary

A critical memory corruption vulnerability has been identified in the snap7-rs library (Rust bindings for snap7), affecting versions up to and including 1.142.1. The issue resides in the S7Partner destructor's handling of the pthread_cond_destroy call within the public API. Under specific conditions triggered during fuzzing, the function results in a segmentation fault, indicating a use-after-free or double-free condition leading to memory corruption [1].

Exploitation

Context

The vulnerability was discovered through fuzzing of the snap7-rs public API. The exploit requires the attacker to invoke the S7Partner destructor in a way that triggers the flawed cleanup of a condition variable. No authentication is required as the attack vector likely involves crafting specific API calls or network interactions that cause the internal state to be corrupted. The issue has been publicly disclosed with proof-of-concept details on the project's issue tracker [1].

Impact

Successful exploitation could lead to a denial-of-service condition (application crash) and, in more severe cases, arbitrary code execution due to memory corruption. The vulnerability impacts all applications using vulnerable versions of the snap7-rs library that expose the S7Partner component to untrusted input.

Mitigation

As of the publication date, no official patch has been released by the maintainer. Users are advised to temporarily restrict access to affected components, apply memory safety mitigations, or consider alternative implementations until a fixed version becomes available. The issue is publicly known, increasing the risk of exploitation.