Debian Security Advisory

DLA-2268-2 mutt -- LTS security update

Date Reported:
30 Jun 2020
Affected Packages:
Security database references:
In Mitre's CVE dictionary: CVE-2020-14093, CVE-2020-14954.
More information:

Two vulnerabilities have been discovered in mutt, a console email client.

  • CVE-2020-14093

    Mutt allowed an IMAP fcc/postpone man-in-the-middle attack via a PREAUTH response.

  • CVE-2020-14954

    Mutt had a STARTTLS buffering issue that affected IMAP, SMTP, and POP3. When a server had sent a begin TLS response, the client read additional data (e.g., from a man-in-the-middle attacker) and evaluated it in a TLS context, aka response injection.

In Debian jessie, the mutt source package builds two variants of mutt: mutt and mutt-patched.

The previous package version (1.5.23-3+deb8u2, DLA-2268-1) provided fixes for the issues referenced above, but they were only applied for the mutt-patched package build, not for the (vanilla) mutt package build.

For Debian 8 Jessie, these problems have been fixed in version 1.5.23-3+deb8u3.

We recommend that you upgrade your mutt packages.

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