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.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | mutt | 2.0.2-1 | — |
| Debian 14 | neomutt | 20201120+dfsg.1-1 | — |
| Debian 13 | mutt | 2.0.2-1 | — |
| Debian 13 | neomutt | 20201120+dfsg.1-1 | — |
| Debian 12 | mutt | 2.0.2-1 | — |
| Debian 12 | neomutt | 20201120+dfsg.1-1 | — |
| Debian 9 | mutt | 1.7.2-1+deb9u4 | DLA-2472-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | mutt | 1.13.2-1ubuntu0.3 | USN-4645-1 |
| Ubuntu 18.04 LTS | mutt | 1.9.4-3ubuntu0.4 | USN-4645-1 |
| Ubuntu 16.04 LTS | mutt | 1.5.24-1ubuntu0.5 | USN-4645-1 |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 24.04 LTS | neomutt | 20231103+dfsg1-1ubuntu0.1~esm1 | USN-7204-1 |
| Ubuntu Pro 22.04 LTS | neomutt | 20211029+dfsg1-1ubuntu0.1~esm1 | USN-7204-1 |
| Ubuntu Pro 20.04 LTS | neomutt | 20191207+dfsg.1-1.1ubuntu0.1~esm1 | USN-7204-1 |
| Ubuntu Pro 18.04 LTS | neomutt | 20171215+dfsg.1-1ubuntu0.1~esm1 | USN-7204-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | mutt | 5:2.0.7-1.el8 | RHSA-2021:4181 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 8 | mutt | 5:2.0.7-1.el8 | ALSA-2021:4181 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 8 | mutt | 5:2.0.7-1.el8 | RLSA-2021:4181 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP2 | mutt | 1.10.1-3.11.1 | SUSE-SU-2020:3568-1 |
| SLES 15 SP1 | mutt | 1.10.1-3.11.1 | SUSE-SU-2020:3568-1 |
| SLES 15 | mutt | 1.10.1-3.11.1 | SUSE-SU-2020:3568-1 |
| SLES 12 SP5 | mutt | 1.10.1-55.18.1 | SUSE-SU-2020:3632-1 |
| SLES 12 SP4 | mutt | 1.10.1-55.18.1 | SUSE-SU-2020:3632-1 |
Show 19 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP3 | mutt | 1.10.1-55.18.1 | SUSE-SU-2020:3632-1 |
| SLES 12 SP2 | mutt | 1.10.1-55.18.1 | SUSE-SU-2020:3632-1 |
| SLES 11 SP4 | mutt | 1.5.17-42.56.1 | SUSE-SU-2020:14551-1 |
| SLES for SAP 15 | mutt | 1.10.1-3.11.1 | SUSE-SU-2020:3568-1 |
| SLES for SAP 12 SP5 | mutt | 1.10.1-55.18.1 | SUSE-SU-2020:3632-1 |
| SLES for SAP 12 SP4 | mutt | 1.10.1-55.18.1 | SUSE-SU-2020:3632-1 |
| SLES for SAP 12 SP3 | mutt | 1.10.1-55.18.1 | SUSE-SU-2020:3632-1 |
| SLES for SAP 12 SP2 | mutt | 1.10.1-55.18.1 | SUSE-SU-2020:3632-1 |
| SLE HPC 15 | mutt | 1.10.1-3.11.1 | SUSE-SU-2020:3568-1 |
| SUSE Package Hub 15 SP2 | neomutt | 20201120-bp152.2.3.1 | openSUSE-SU-2020:2158-1 |
| SUSE Package Hub 15 SP1 | neomutt | 20201120-bp151.3.3.1 | openSUSE-SU-2020:2157-1 |
| SUSE OpenStack Cloud Crowbar 9 | mutt | 1.10.1-55.18.1 | SUSE-SU-2020:3632-1 |
| SUSE OpenStack Cloud Crowbar 8 | mutt | 1.10.1-55.18.1 | SUSE-SU-2020:3632-1 |
| SUSE OpenStack Cloud 9 | mutt | 1.10.1-55.18.1 | SUSE-SU-2020:3632-1 |
| SUSE OpenStack Cloud 8 | mutt | 1.10.1-55.18.1 | SUSE-SU-2020:3632-1 |
| SUSE OpenStack Cloud 7 | mutt | 1.10.1-55.18.1 | SUSE-SU-2020:3632-1 |
| SUSE Linux Enterprise Point of Sale 11 SP3 | mutt | 1.5.17-42.56.1 | SUSE-SU-2020:14551-1 |
| SUSE HPE Helion OpenStack 8 | mutt | 1.10.1-55.18.1 | SUSE-SU-2020:3632-1 |
| SUSE Enterprise Storage 5 | mutt | 1.10.1-55.18.1 | SUSE-SU-2020:3632-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | mutt | 2.0.7-2.2 | openSUSE-SU-2024:11069-1 |
| openSUSE Tumbleweed | neomutt | 20210205-3.3 | openSUSE-SU-2024:11079-1 |
| openSUSE Leap 15.2 | mutt | 1.10.1-lp152.3.6.1 | openSUSE-SU-2020:2141-1 |
| openSUSE Leap 15.2 | neomutt | 20201120-lp152.2.3.1 | openSUSE-SU-2020:2127-1 |
| openSUSE Leap 15.1 | mutt | 1.10.1-lp151.2.6.1 | openSUSE-SU-2020:2128-1 |
| openSUSE Leap 15.1 | neomutt | 20201120-lp152.2.3.1 | openSUSE-SU-2020:2127-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | mutt | 2.0.2-r0 | — |
| Alpine v3.23 | mutt | 2.0.2-r0 | — |
| Alpine v3.22 | mutt | 2.0.2-r0 | — |
| Alpine v3.21 | mutt | 2.0.2-r0 | — |
| Alpine v3.20 | mutt | 2.0.2-r0 | — |
Show 7 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | mutt | 2.0.2-r0 | — |
| Alpine v3.18 | mutt | 2.0.2-r0 | — |
| Alpine v3.17 | mutt | 2.0.2-r0 | — |
| Alpine v3.16 | mutt | 2.0.2-r0 | — |
| Alpine v3.15 | mutt | 2.0.2-r0 | — |
| Alpine v3.14 | mutt | 2.0.2-r0 | — |
| Alpine v3.13 | mutt | 2.0.2-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | mutt | 5:1.5.21-29.amzn2.0.1 | ALAS2-2022-1892 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | mutt | 5:2.0.7-1.el8 | ELSA-2021-4181 |
Advisories 19
- ALSA-2021:4181 Moderate: mutt security, bug fix, and enhancement update AlmaLinux Security Advisories · Oct 29, 2026
- USN-7204-1 neomutt vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- DLA-2472-1 mutt - security update Debian Security (DSA / DLA) · Mar 9, 2026
- USN-4645-1 mutt vulnerability Ubuntu Security Notices (USN) · Feb 10, 2026
- RLSA-2021:4181 Moderate: mutt security, bug fix, and enhancement update Rocky Linux Security Advisories · Feb 4, 2026
- openSUSE-SU-2020:2141-1 Security update for mutt SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:2128-1 Security update for mutt SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:2158-1 Security update for neomutt SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:3568-1 Security update for mutt SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:11069-1 mutt-2.0.7-2.2 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:14551-1 Security update for mutt SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:2157-1 Security update for neomutt SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:2127-1 Security update for neomutt SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:11079-1 neomutt-20210205-3.3 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:3632-1 Security update for mutt SUSE / openSUSE Security Updates · Feb 4, 2026
- RHSA-2021:4181 Red Hat Security Advisory: mutt security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- WID-SEC-2022-2241 mutt: Schwachstelle ermöglicht Offenlegung von Informationen BSI CERT-Bund (WID) · Jan 15, 2025
- ALAS2-2022-1892 Moderate: mutt security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Dec 6, 2022
- ELSA-2021-4181 Moderate: mutt security, bug fix, and enhancement update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Nov 16, 2021
References
- https://gitlab.com/muttmua/mutt/-/commit/d92689088dfe80a290ec836e292376e2d9984f8f
- https://gitlab.com/muttmua/mutt/-/commit/04b06aaa3e0cc0022b9b01dbca2863756ebbf59a
- https://github.com/neomutt/neomutt/commit/9c36717a3e2af1f2c1b7242035455ec8112b4b06
- https://github.com/neomutt/neomutt/releases/tag/20201120
- [debian-lts-announce] 20201130 [SECURITY] [DLA 2472-1] mutt security update mailing-list
- GLSA-202101-32 vendor-advisory