A netqmail security update has been released for Debian GNU/Linux 9 and 10 to multiple vulnerabilities in qmail.

DSA 4692-1: netqmail security update

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Debian Security Advisory DSA-4692-1 security@debian.org
  https://www.debian.org/security/ Salvatore Bonaccorso
May 24, 2020   https://www.debian.org/security/faq
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Package : netqmail
CVE ID : CVE-2005-1513 CVE-2005-1514 CVE-2005-1515 CVE-2020-3811
CVE-2020-3812
Debian Bug : 961060

Georgi Guninski and the Qualys Research Labs discovered multiple
vulnerabilities in qmail (shipped in Debian as netqmail with additional
patches) which could result in the execution of arbitrary code, bypass
of mail address verification and a local information leak whether a file
exists or not.

For the oldstable distribution (stretch), these problems have been fixed
in version 1.06-6.2~deb9u1.

For the stable distribution (buster), these problems have been fixed in
version 1.06-6.2~deb10u1.

We recommend that you upgrade your netqmail packages.

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

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/