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Critical severity · published Dec 27, 2021
CVE-2021-43845
PJSIP is a free and open source multimedia communication library
9.1
CVSS
3.9%
EPSS
No
On KEV
Description
PJSIP is a free and open source multimedia communication library. In version 2.11.1 and prior, if incoming RTCP XR message contain 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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)3.9% · higher than 90% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
DL
Debian Linux · Debian
9.0; 10.0; 11.0 · source: NVD
PJ
Pjsip · Teluu
through 2.11.1 · source: NVD
Affected product
DL
Debian Linux
Debian
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-43845
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-43845
Patch
https://github.com/pjsip/pjproject/commit/f74c1fc22b760d2a24369aa72c74c4a9ab985859
Exploit
https://github.com/pjsip/pjproject/pull/2924
Patch
https://github.com/pjsip/pjproject/security/advisories/GHSA-r374-qrwv-86hh
Mailing List
https://lists.debian.org/debian-lts-announce/2022/03/msg00035.html
Mailing List
https://lists.debian.org/debian-lts-announce/2022/11/msg00021.html
lists.debian.org
https://lists.debian.org/debian-lts-announce/2023/08/msg00038.html
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