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

DLA 2502-1: postsrsd security update

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Debian LTS Advisory DLA-2502-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Adrian Bunk
December 20, 2020   https://wiki.debian.org/LTS
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Package : postsrsd
Version : 1.4-1+deb9u1
CVE ID : CVE-2020-35573
Debian Bug :

A potential denial-of-service attack through malicious timestamp tags
was fixed in PostSRSd, a Sender Rewriting Scheme (SRS) lookup table for
Postfix.

For Debian 9 stretch, this problem has been fixed in version
1.4-1+deb9u1.

We recommend that you upgrade your postsrsd packages.

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

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