CVE-2021-21375

NameCVE-2021-21375
DescriptionPJSIP 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.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
ReferencesDLA-2636-1, DLA-2665-1
NVD severitymedium
Debian Bugs986815

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
pjproject (PTS)stretch2.5.5~dfsg-6+deb9u1vulnerable
stretch (security)2.5.5~dfsg-6+deb9u2fixed
ring (PTS)stretch20161221.2.7bd7d91~dfsg1-1vulnerable
stretch (security)20161221.2.7bd7d91~dfsg1-1+deb9u1fixed
buster20190215.1.f152c98~ds1-1vulnerable
bullseye, sid20210112.2.b757bac~ds1-1fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
pjprojectsourcestretch2.5.5~dfsg-6+deb9u2DLA-2636-1
pjprojectsource(unstable)(unfixed)
ringsourcestretch20161221.2.7bd7d91~dfsg1-1+deb9u1DLA-2665-1
ringsource(unstable)20210112.2.b757bac~ds1-1986815

Notes

[buster] - ring <no-dsa> (Minor issue; can be fixed via point release)
https://github.com/pjsip/pjproject/security/advisories/GHSA-hvq6-f89p-frvp
https://github.com/pjsip/pjproject/commit/97b3d7addbaa720b7ddb0af9bf6f3e443e664365

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