A strongswan security update has been released for Debian GNU/Linux 9 LTS to address an issue that could lead to a denial-of-service attack.

DLA 2909-1: strongswan security update

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Debian LTS Advisory DLA-2909-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Utkarsh Gupta
February 03, 2022   https://wiki.debian.org/LTS
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Package : strongswan
Version : 5.5.1-4+deb9u6
CVE ID : CVE-2021-45079

Zhuowei Zhang discovered a bug in the EAP authentication client code
of strongSwan, an IKE/IPsec suite, that may allow to bypass the client
and in some scenarios even the server authentication, or could lead to
a denial-of-service attack.

For Debian 9 stretch, this problem has been fixed in version
5.5.1-4+deb9u6.

We recommend that you upgrade your strongswan packages.

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

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