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 version 2.10 and earlier, PJSIP transport can be reused if they have the same IP address + port + protocol. However, this is insufficient for secure transport since it lacks remote hostname authentication. Suppose we have created a TLS connection to ``, which has an IP address ``. If we want to create a TLS connection to another hostname, say ``, which has the same IP address, then it will reuse that existing connection, even though `` does not have certificate to authenticate as ``. The vulnerability allows for an insecure interaction without user awareness. It affects users who need access to connections to different destinations that translate to the same address, and allows man-in-the-middle attack if attacker can route a connection to another destination such as in the case of DNS spoofing.
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)
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+deb9u1fixed
stretch (security)2.5.5~dfsg-6+deb9u2fixed
ring (PTS)stretch20161221.2.7bd7d91~dfsg1-1fixed
stretch (security)20161221.2.7bd7d91~dfsg1-1+deb9u1fixed
sid, bullseye20210112.2.b757bac~ds1-1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
pjprojectsourcestretch(not affected)
ringsourcestretch(not affected)
ringsourcebuster(not affected)


[stretch] - pjproject <not-affected> (Vulnerable code introduced later, no connection reuse available)
[buster] - ring <not-affected> (Vulnerable code introduced later, no connection reuse available in embedded pjproject)
[stretch] - ring <not-affected> (Vulnerable code introduced later, no connection reuse available in embedded pjproject)

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