CVE-2020-28896

MEDIUM

Mutt < 2.0.2 and NeoMutt < 2020-11-20 - Unencrypted Credential Exposure via Invalid IMAP Server Response

Title source: llm
STIX 2.1

Description

Mutt before 2.0.2 and NeoMutt before 2020-11-20 did not ensure that $ssl_force_tls was processed if an IMAP server's initial server response was invalid. The connection was not properly closed, and the code could continue attempting to authenticate. This could result in authentication credentials being exposed on an unencrypted connection, or to a machine-in-the-middle.

References (6)

Core 6
Core References
Release Notes, Third Party Advisory x_refsource_misc
https://github.com/neomutt/neomutt/releases/tag/20201120
Mailing List, Third Party Advisory mailing-list x_refsource_mlist
https://lists.debian.org/debian-lts-announce/2020/11/msg00048.html
Third Party Advisory vendor-advisory x_refsource_gentoo
https://security.gentoo.org/glsa/202101-32

Scores

CVSS v3 5.3
EPSS 0.0232
EPSS Percentile 81.3%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N

Details

CWE
CWE-287 CWE-755
Status published
Products (3)
debian/debian_linux 9.0
mutt/mutt < 2.0.2
neomutt/neomutt < 2020-11-20
Published Nov 23, 2020
Tracked Since Feb 18, 2026