PT-2021-23975 · Pjsip+3 · Pjsip+3

The-Storm · Published 2021-12-27 · Updated 2025-11-04 · CVE-2021-43845

Positive Technologies (AI Summary)

CVSS v3.1

9.1

Critical

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

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

Description: The issue affects PJSIP, a free and open source multimedia communication library. In the affected versions, if an incoming RTCP XR message contains a block, the data field is not checked against the received packet size, potentially resulting in an out-of-bound read access. This affects all users that use PJMEDIA and RTCP XR. A malicious actor can send a RTCP XR message with an invalid packet size.

Recommendations: For PJSIP versions 2.11.1 and prior, consider updating to a version that includes a fix for this issue, as no specific workaround is provided for these versions. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Out of bounds Read

Weakness Enumeration

CWE-125

Related Identifiers

ALT-PU-2024-15954

ALT-PU-2024-16030

CVE-2021-43845

DLA-2962-1

DLA-3194-1

DLA-3549-1

DLA-3887-1

DSA-5285-1

GHSA-R374-QRWV-86HH

USN-6422-1

Affected Products

Alt Linux

Linuxmint

Pjsip

Ubuntu

References · 47

• 🔥 https://github.com/pjsip/pjproject/pull/2924 · Exploit
• https://github.com/pjsip/pjproject/security/advisories/GHSA-r374-qrwv-86hh · Patch
• https://github.com/pjsip/pjproject/commit/f74c1fc22b760d2a24369aa72c74c4a9ab985859 · Patch
• https://ubuntu.com/security/CVE-2022-39244 · Vendor Advisory
• https://debian.org/security/2022/dsa-5285 · Vendor Advisory
• https://ubuntu.com/security/CVE-2022-21723 · Vendor Advisory
• https://osv.dev/vulnerability/DLA-3887-1 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2021-43845 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2021-43845 · Vendor Advisory
• https://ubuntu.com/security/CVE-2022-23608 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-43301 · Vendor Advisory
• https://osv.dev/vulnerability/DLA-2962-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2022-23547 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-43302 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-43300 · Vendor Advisory