A fastd security update has been released for Debian GNU/Linux 9 LTS to address a receive buffer handling problem which allows a denial of service (memory exhaustion) when receiving packets with an invalid type code.

DLA-2414-1: fastd security update

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Debian LTS Advisory DLA-2414-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Sven Eckelmann
October 25, 2020   https://wiki.debian.org/LTS
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Package : fastd
Version : 18-2+deb9u1
CVE ID : CVE-2020-27638
Debian Bug : 972521

In fastd, a fast and secure tunnelling daemon, a receive buffer
handling problem was discovered which allows a denial of service
(memory exhaustion) when receiving packets with an invalid type code.

For Debian 9 stretch, this problem has been fixed in version
18-2+deb9u1.

We recommend that you upgrade your fastd packages.

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

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