Out-of-bounds Read in Pjsip Pjproject
CVE-2021-43804
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 affected versions if the incoming RTCP BYE message contains a reason's length, this declared length is not checked against the actual received packet size, potentially resulting in an out-of-bound read access. This issue affects all users that use PJMEDIA and RTCP. A malicious actor can send a RTCP BYE message with an invalid reason length. Users are advised to upgrade as soon as possible. There are no known workarounds.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.021 (81.3th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 81st percentile — 81.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.022 · newest: 0.021 · change: -0.001
Affected products
- Pjsip Pjproject — versions <= 2.11.1
- Teluu Pjsip
- Debian Linux — versions 9.0, 10.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/pjsip/pjproject/security/advisories/GHSA-3qx3-cg72-wrh9 (Patch, Third Party Advisory)
- github.com/pjsip/pjproject/commit/8b621f192cae14456ee0b0ade52ce6c6f258af1e (Patch, 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)
- lists.debian.org/debian-lts-announce/2022/11/msg00021.html (mailing-list, Mailing List, Third Party Advisory)
- www.debian.org/security/2022/dsa-5285 (vendor-advisory, Third Party Advisory)
- lists.debian.org/debian-lts-announce/2023/08/msg00038.html (mailing-list)
- af854a3a-2127-422b-91ae-364da2661108
Frequently asked questions
- What is CVE-2021-43804?
- CVE-2021-43804 is a high-severity vulnerability in Pjsip Pjproject, classified under Out-of-bounds Read. CVSS score: 7.3/10. Published 2021-12-22.
- How severe is CVE-2021-43804?
- High severity. CVSS v3 base score is 7.3 out of 10.
- Is CVE-2021-43804 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.