Auth bypass in Mutt
CVE-2020-28896
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.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.024 (83.4th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 83rd percentile — 83.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.024 · newest: 0.024 · change: 0.000
Affected products
- Mutt
- Neomutt
- Debian Linux — versions 9.0
Weakness classification (CWE)
References
- gitlab.com/muttmua/mutt/-/commit/d92689088dfe80a290ec836e292376e2d9984f8f (Patch, Third Party Advisory)
- gitlab.com/muttmua/mutt/-/commit/04b06aaa3e0cc0022b9b01dbca2863756ebbf59a (Patch, Third Party Advisory)
- github.com/neomutt/neomutt/commit/9c36717a3e2af1f2c1b7242035455ec8112b4b06 (Patch, Third Party Advisory)
- github.com/neomutt/neomutt/releases/tag/20201120 (Third Party Advisory, Release Notes)
- lists.debian.org/debian-lts-announce/2020/11/msg00048.html (mailing-list, Mailing List, Third Party Advisory)
- security.gentoo.org/glsa/202101-32 (vendor-advisory, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-28896?
- CVE-2020-28896 is a medium-severity vulnerability in Mutt, classified under Improper Authentication. CVSS score: 5.3/10. Published 2020-11-23.
- How severe is CVE-2020-28896?
- Medium severity. CVSS v3 base score is 5.3 out of 10.