Vulnerability in Pjsip Pjproject
CVE-2021-32686
PJSIP is a free and open source multimedia communication library written in C language implementing standard based protocols such as SIP, SDP, RTP, STUN, TURN, and ICE. In PJSIP before version 2.11.1, there are a couple of issues found in the SSL socket. First, a race condition between callback and destroy, due to the accepted socket having no group lock. Second, the SSL socket parent/listener may get destroyed during handshake. Both issues were reported to happen intermittently in heavy load TLS connections. They cause a crash, resulting in a denial of service. These are fixed in version 2.11.1.
Vulnerability class: Race Condition
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.021 (80.6th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 81st percentile — 80.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.021 · newest: 0.021 · change: 0.000
Affected products
- Pjsip Pjproject — versions < 2.11.1
- Teluu Pjsip
- Debian Linux — versions 9.0, 11.0
Weakness classification (CWE)
References
- github.com/pjsip/pjproject/security/advisories/GHSA-cv8x-p47p-99wr (Third Party Advisory)
- github.com/pjsip/pjproject/pull/2716 (Patch, Third Party Advisory)
- github.com/pjsip/pjproject/commit/d5f95aa066f878b0aef6a64e60b61e8626e664cd (Patch, Third Party Advisory)
- github.com/pjsip/pjproject/releases/tag/2.11.1 (Third Party Advisory, Release Notes)
- www.debian.org/security/2021/dsa-4999 (vendor-advisory, Third Party Advisory)
- lists.debian.org/debian-lts-announce/2022/03/msg00035.html (mailing-list, Mailing List, Third Party Advisory)
- security.gentoo.org/glsa/202210-37 (vendor-advisory, Third Party Advisory)
- af854a3a-2127-422b-91ae-364da2661108
Frequently asked questions
- What is CVE-2021-32686?
- CVE-2021-32686 is a medium-severity vulnerability in Pjsip Pjproject, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 5.9/10. Published 2021-07-23.
- How severe is CVE-2021-32686?
- Medium severity. CVSS v3 base score is 5.9 out of 10.