Debian Security Advisory

DLA-2665-1 ring -- LTS security update

Date Reported:
23 May 2021
Affected Packages:
Security database references:
In Mitre's CVE dictionary: CVE-2021-21375.
More information:

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 CVE. 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 20161221.2.7bd7d91~dfsg1-1+deb9u1.

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: