Debian Security Advisory

DSA-4745-1 dovecot -- security update

Date Reported:
12 Aug 2020
Affected Packages:
Security database references:
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 the stable distribution (buster), these problems have been fixed in version 1:

We recommend that you upgrade your dovecot packages.

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