Debian Security Advisory

DLA-2328-1 dovecot -- LTS security update

Date Reported:
15 Aug 2020
Affected Packages:
Security database references:
In the Debian bugtracking system: Bug 968302.
In Mitre's CVE dictionary: CVE-2020-12100, CVE-2020-12673, CVE-2020-12674.
More information:

Several vulnerabilities have been discovered in the Dovecot email server.

  • CVE-2020-12100

    Receiving mail with deeply nested MIME parts leads to resource exhaustion as Dovecot attempts to parse it.

  • CVE-2020-12673

    Dovecot's NTLM implementation does not correctly check message buffer size, which leads to a crash when reading past allocation.

  • CVE-2020-12674

    Dovecot's RPA mechanism implementation accepts zero-length message, which leads to assert-crash later on.

For Debian 9 stretch, these problems have been fixed in version 1:2.2.27-3+deb9u6.

We recommend that you upgrade your dovecot packages.

For the detailed security status of dovecot please refer to its security tracker page at:

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