Ryancaicse

**Name of the Vulnerable Software and Affected Versions** PJSIP versions up to and including 2.11.1 **Description** The issue is related to synchronization errors when using shared resources in the PJSIP library. When an error or failure occurs in various parts of PJSIP, the function returns without releasing the currently held locks, potentially resulting in a system deadlock and causing a denial of service for users. **Recommendations** For versions up to and including 2.11.1, users may need to manually apply the patch, as no release has yet been made that contains the linked fix commit. As a temporary workaround, consider restricting access to shared resources to minimize the risk of exploitation.