A dovecot security update has been released for Debian GNU/Linux 10 to address two security issues.

DLA 3122-1: dovecot security update

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Debian LTS Advisory DLA-3122-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Anton Gladky
September 27, 2022   https://wiki.debian.org/LTS
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Package : dovecot
Version : 1:2.3.4.1-5+deb10u7
CVE ID : CVE-2021-33515 CVE-2022-30550

Two security issues were discovered in dovecot: IMAP and POP3 email server.

CVE-2021-33515

The submission service in Dovecot before 2.3.15 allows STARTTLS command
injection in lib-smtp. Sensitive information can be redirected to an
attacker-controlled address.

CVE-2022-30550

When two passdb configuration entries exist with the same driver and args
settings, incorrectly applied settings can lead to an unintended security
configuration and can permit privilege escalation in certain configurations.

For Debian 10 buster, these problems have been fixed in version
1:2.3.4.1-5+deb10u7.

We recommend that you upgrade your dovecot packages.

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

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