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Debian LTS Advisory DLA-2665-1                [email protected]
https://www.debian.org/lts/security/                    Thorsten Alteholz
May 23, 2021                                  https://wiki.debian.org/LTS
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Package        : ring
Version        : 20161221.2.7bd7d91~dfsg1-1+deb9u1
CVE ID         : CVE-2021-21375

An issue has been found in ring, a secure and distributed voice, video and 
chat platform. Actually the embedded copy of pjproject is affected by this 
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

We recommend that you upgrade your ring packages.

For the detailed security status of ring please refer to
its security tracker page at:

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