CVE-2021-21375

moderate-risk
Published 2021-03-10

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 version 2.10 and earlier, after an initial INVITE has been sent, when two 183 responses are received, with the first one causing negotiation failure, a crash will occur. This results in a denial of service.

Do I need to act?

~
1.3% chance of exploitation in next 30 days
EPSS score — moderate exploit probability
-
Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
6
CVSS 6.5/10 Medium
NETWORK / LOW complexity

Affected Products (2)

Affected Vendors

Debian Teluu

References (10)

Patch https://github.com/pjsip/pjproject/commit/97b3d7addbaa720b7ddb0af9bf6f3e443e6643...
Exploit https://github.com/pjsip/pjproject/security/advisories/GHSA-hvq6-f89p-frvp
Mailing List https://lists.debian.org/debian-lts-announce/2021/04/msg00023.html
Mailing List https://lists.debian.org/debian-lts-announce/2021/05/msg00020.html
Third Party Advisory https://security.gentoo.org/glsa/202107-42
Patch https://github.com/pjsip/pjproject/commit/97b3d7addbaa720b7ddb0af9bf6f3e443e6643...
Exploit https://github.com/pjsip/pjproject/security/advisories/GHSA-hvq6-f89p-frvp
Mailing List https://lists.debian.org/debian-lts-announce/2021/04/msg00023.html
Mailing List https://lists.debian.org/debian-lts-announce/2021/05/msg00020.html
Third Party Advisory https://security.gentoo.org/glsa/202107-42
35
/ 100
moderate-risk
Severity 24/34 · High
Exploitability 4/34 · Minimal
Exposure 7/34 · Low