PT-2021-6700 · Pjsip+2 · Pjsip+2

Sauwming · CVE-2021-32686 · Published 2021-07-23 · Updated 2026-03-24

Positive Technologies (AI Summary)

CVSS v2.0

7.1

High

Base vector

AV:N/AC:M/Au:N/C:N/I:N/A:C

Name of the Vulnerable Software and Affected Versions PJSIP versions prior to 2.11.1

Description The issue is related to the SSL socket in PJSIP, a free and open source multimedia communication library. It involves a race condition between callback and destroy due to the accepted socket having no group lock, and the SSL socket parent/listener may get destroyed during handshake. These issues occur intermittently in heavy load TLS connections and cause a crash, resulting in a denial of service.

Recommendations For versions prior to 2.11.1, update to version 2.11.1 to resolve the issue. As a temporary workaround, consider restricting the use of heavy load TLS connections to minimize the risk of exploitation.

Fix

DoS

Race Condition

Weakness Enumeration

CWE-362

Related Identifiers

ALT-PU-2024-15954

ALT-PU-2024-16030

BDU:2022-02055

CVE-2021-32686

DLA-2962-1

DLA-3887-1

DSA-4999-1

GHSA-CV8X-P47P-99WR

MGASA-2021-0559

USN-8122-1

Affected Products

Alt Linux

Pjsip

Ubuntu

References · 43

• https://github.com/pjsip/pjproject/commit/d5f95aa066f878b0aef6a64e60b61e8626e664cd · Patch
• https://github.com/pjsip/pjproject/pull/2716 · Patch
• https://osv.dev/vulnerability/DEBIAN-CVE-2021-32686 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-32686 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-43299 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-37706 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-21375 · Vendor Advisory
• https://osv.dev/vulnerability/USN-8122-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-43302 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2021-32686 · Security Note
• https://ubuntu.com/security/CVE-2021-43300 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-32686 · Security Note
• https://ubuntu.com/security/CVE-2021-43301 · Vendor Advisory
• https://osv.dev/vulnerability/DLA-3887-1 · Vendor Advisory
• https://security.gentoo.org/glsa/202210-37 · Vendor Advisory