A coturn security update has been released for both Debian GNU/Linux 9 and 10 to address three security issues.

DSA 4711-1: coturn security update

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Debian Security Advisory DSA-4711-1 security@debian.org
  https://www.debian.org/security/ Salvatore Bonaccorso
June 29, 2020   https://www.debian.org/security/faq
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Package : coturn
CVE ID : CVE-2020-4067 CVE-2020-6061 CVE-2020-6062
Debian Bug : 951876

Several vulnerabilities were discovered in coturn, a TURN and STUN
server for VoIP.

CVE-2020-4067

Felix Doerre reported that the STUN response buffer was not properly
initialised, which could allow an attacker to leak bytes in the
padding bytes from the connection of another client.

CVE-2020-6061

Aleksandar Nikolic reported that a crafted HTTP POST request can
lead to information leaks and other misbehavior.

CVE-2020-6062

Aleksandar Nikolic reported that a crafted HTTP POST request can
lead to server crash and denial of service.

For the oldstable distribution (stretch), these problems have been fixed
in version 4.5.0.5-1+deb9u2.

For the stable distribution (buster), these problems have been fixed in
version 4.5.1.1-1.1+deb10u1.

We recommend that you upgrade your coturn packages.

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

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