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

DSA 4763-1: teeworlds security update

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Debian Security Advisory DSA-4763-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
September 14, 2020   https://www.debian.org/security/faq
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Package : teeworlds
CVE ID : CVE-2020-12066

It was discovered that insufficient sanitising of received network
packets in the game server of Teeworlds, an online multi-player platform
2D shooter, could result in denial of service.

For the stable distribution (buster), this problem has been fixed in
version 0.7.2-5+deb10u1.

We recommend that you upgrade your teeworlds packages.

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

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/