A libreswan security update has been released for Debian GNU/Linux 10.

DSA 4684-1: libreswan security update

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Debian Security Advisory DSA-4684-1 security@debian.org
  https://www.debian.org/security/ Salvatore Bonaccorso
May 13, 2020   https://www.debian.org/security/faq
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Package : libreswan
CVE ID : CVE-2020-1763
Debian Bug : 960458

Stephan Zeisberg discovered that the libreswan IPsec implementation
could be forced into a crash/restart via a malformed IKEv1 Informational
Exchange packet, resulting in denial of service.

For the stable distribution (buster), this problem has been fixed in
version 3.27-6+deb10u1.

We recommend that you upgrade your libreswan packages.

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

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/