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
EPSS: 0.022 (80.6th percentile) — read the EPSS interpretation.
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.
Affected products
- Pjsip Pjproject — versions <= 2.11.1
- Teluu Pjsip
- Debian Debian_linux — versions 9.0, 10.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security-advisories@github.com (Patch, Third Party Advisory)
- security-advisories@github.com (Patch, Third Party Advisory)
- security-advisories@github.com (mailing-list, Mailing List, Third Party Advisory)
- security-advisories@github.com (vendor-advisory, Third Party Advisory)
- security-advisories@github.com (mailing-list, Mailing List, Third Party Advisory)
- security-advisories@github.com (vendor-advisory, Third Party Advisory)
- security-advisories@github.com (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.