CVE-2021-32686 Explained : Impact and Mitigation
Discover the details of CVE-2021-32686, a denial of service vulnerability in PJSIP before version 2.11.1 due to a race condition and destroyed parent/listener during handshake, impacting heavy load TLS connections.
A denial of service vulnerability in PJSIP before version 2.11.1 that affects the SSL socket due to a race condition and destroyed parent/listener during handshake. This could lead to a crash under heavy load TLS connections, resulting in denial of service. The issue has been fixed in version 2.11.1.
Understanding CVE-2021-32686
PJSIP, a multimedia communication library implementing standard protocols such as SIP, SDP, and RTP, had a denial of service vulnerability due to issues in the SSL socket.
What is CVE-2021-32686?
PJSIP had a race condition and destroyed parent/listener during handshake leading to denial of service upon heavy load TLS connections.
The Impact of CVE-2021-32686
Exploitation of this vulnerability could crash the service under heavy load TLS connections, resulting in denial of service.
Technical Details of CVE-2021-32686
The vulnerability was classified as CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition'). The CVSS v3.1 base score is 5.9, indicating a medium severity issue with high availability impact.
Vulnerability Description
The race condition and destroyed parent/listener during handshake in the SSL socket could crash the service under heavy load TLS connections.
Affected Systems and Versions
Vendor: pjsip, Product: pjproject, Versions Affected: < 2.11.1
Exploitation Mechanism
Exploiting the race condition and destroyed parent/listener during handshake in the SSL socket can lead to a denial of service.
Mitigation and Prevention
To mitigate the risk associated with CVE-2021-32686, immediate patching to version 2.11.1 is recommended. Follow long-term security practices and regularly update the PJSIP library to stay protected against such vulnerabilities.
Immediate Steps to Take
Update to version 2.11.1 of PJSIP to address the denial of service vulnerability.
Long-Term Security Practices
Regularly update and monitor security advisories to stay informed about potential vulnerabilities.
Patching and Updates
Keep the PJSIP library up to date with the latest releases to ensure protection against known security issues.