A pjproject security update has been released for Debian GNU/Linux 9 LTS to address a denial of service issue.

DLA 2636-1: pjproject security update

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Debian LTS Advisory DLA-2636-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Thorsten Alteholz
April 23, 2021   https://wiki.debian.org/LTS
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Package : pjproject
Version : 2.5.5~dfsg-6+deb9u2
CVE ID : CVE-2021-21375

An issue has been found in pjproject, a set of libraries for the PJ
Project.
Due to bad handling of two consecutive crafted answers to an INVITE, the
attacker is able to crash the server resulting in a denial of service.

For Debian 9 stretch, this problem has been fixed in version
2.5.5~dfsg-6+deb9u2.

We recommend that you upgrade your pjproject packages.

For the detailed security status of pjproject please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/pjproject

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://wiki.debian.org/LTS