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CVE-2020-28896

20
FAUCET Score

CVE-2020-28896 affects Mutt before 2.0.2 and NeoMutt before 2020-11-20, where a flaw in handling invalid IMAP server responses could lead to authentication credentials being exposed over unencrypted connections or to a man-in-the-middle. This medium-severity vulnerability (CVSS 5.3) has a network attack vector and high confidentiality impact, but requires user interaction and high attack complexity. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 2.0.2CPE matchmatch criteria
cpe:2.3:a:mutt:mutt:*:*:*:*:*:*:*:*
< 2020-11-20CPE matchmatch criteria
cpe:2.3:a:neomutt:neomutt:*:*:*:*:*:*:*:*
9.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.3MEDIUM

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
1.6
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.32%
Probability of exploitation in next 30 days
EPSS Percentile
81.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0232 is in the 87th percentile among its peer group of 707 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.2 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.2 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: mutt-5:2.0.7-1.el8
View patch

Vendor Advisories (1)

redhatCVE-2020-28896Moderate

mutt: Incorrect handling of invalid initial IMAP responses could lead to an authentication attempt over unencrypted connection

Nov 20, 2020

References

github.com / neomutt/neomutt/commit/9c36717a3e2af1f2c1b7242035455ec8112b4b06
PatchThird Party Advisory
github.com / neomutt/neomutt/releases/tag/20201120
Release NotesThird Party Advisory
gitlab.com / muttmua/mutt/-/commit/04b06aaa3e0cc0022b9b01dbca2863756ebbf59a
PatchThird Party Advisory
gitlab.com / muttmua/mutt/-/commit/d92689088dfe80a290ec836e292376e2d9984f8f
PatchThird Party Advisory
lists.debian.org / debian-lts-announce/2020/11/msg00048.html
Mailing ListThird Party Advisory
security.gentoo.org / glsa/202101-32
Third Party Advisory