Debian Security Advisory

DLA-2517-1 dovecot -- LTS security update

Date Reported:
05 Jan 2021
Affected Packages:
Security database references:
In Mitre's CVE dictionary: CVE-2020-24386, CVE-2020-25275.
More information:

It was discovered that there were two issues in the Dovecot IMAP server:

  • CVE-2020-24386

    An issue was discovered in Dovecot before 2.3.13. By using IMAP IDLE, an authenticated attacker can trigger unhibernation via attacker-controlled parameters, leading to access to other users' email messages (and path disclosure).

  • CVE-2020-25275

    Dovecot before 2.3.13 has Improper Input Validation in lda, lmtp, and imap, leading to an application crash via a crafted email message with certain choices for ten thousand MIME parts.

For Debian 9 Stretch, these problems have been fixed in version 1:2.2.27-3+deb9u7.

We recommend that you upgrade your dovecot packages.

Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: