Description
Fetchmail before 6.4.22 fails to enforce STARTTLS session encryption in some circumstances, such as a certain situation with IMAP and PREAUTH.
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 | fetchmail | 6.4.22-1 | — |
| Debian 13 | fetchmail | 6.4.22-1 | — |
| Debian 12 | fetchmail | 6.4.22-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | fetchmail | No fix yet | — |
| Ubuntu Pro 18.04 LTS | fetchmail | No fix yet | — |
| Ubuntu Pro 16.04 LTS | fetchmail | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | fetchmail | 6.4.24-1.el8 | RHSA-2022:1964 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 8 | fetchmail | 6.4.24-1.el8 | ALSA-2022:1964 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 8 | fetchmail | 6.4.24-1.el8 | RLSA-2022:1964 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP3 | fetchmail | 6.3.26-20.17.1 | SUSE-SU-2021:4018-1, SUSE-SU-2021:3493-1 |
| SLES 15 SP2 | fetchmail | 6.3.26-20.17.1 | SUSE-SU-2021:4018-1, SUSE-SU-2021:3493-1 |
| SLES 15 SP1 | fetchmail | 6.4.22-20.20.1 | SUSE-SU-2021:4018-1 |
| SLES 15 | fetchmail | 6.4.22-20.20.1 | SUSE-SU-2021:4018-1 |
| SLES 12 SP5 | fetchmail | 6.3.26-13.15.1 | SUSE-SU-2021:3492-1 |
Show 6 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP1 | fetchmail | 6.4.22-20.20.1 | SUSE-SU-2021:4018-1 |
| SLES for SAP 15 | fetchmail | 6.4.22-20.20.1 | SUSE-SU-2021:4018-1 |
| SLES for SAP 12 SP5 | fetchmail | 6.3.26-13.15.1 | SUSE-SU-2021:3492-1 |
| SLE HPC 15 SP1 | fetchmail | 6.4.22-20.20.1 | SUSE-SU-2021:4018-1 |
| SLE HPC 15 | fetchmail | 6.4.22-20.20.1 | SUSE-SU-2021:4018-1 |
| SUSE Enterprise Storage 6 | fetchmail | 6.4.22-20.20.1 | SUSE-SU-2021:4018-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | fetchmail | 6.4.22-1.1 | openSUSE-SU-2024:11573-1 |
| openSUSE Leap 15.3 | fetchmail | 6.3.26-20.17.1 | openSUSE-SU-2021:4018-1, openSUSE-SU-2021:3493-1 |
| openSUSE Leap 15.2 | fetchmail | 6.3.26-lp152.6.9.1 | openSUSE-SU-2021:1591-1, openSUSE-SU-2021:1416-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | fetchmail | 6.4.22-r0 | — |
| Alpine v3.23 | fetchmail | 6.4.22-r0 | — |
| Alpine v3.22 | fetchmail | 6.4.22-r0 | — |
| Alpine v3.21 | fetchmail | 6.4.22-r0 | — |
| Alpine v3.20 | fetchmail | 6.4.22-r0 | — |
Show 6 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | fetchmail | 6.4.22-r0 | — |
| Alpine v3.18 | fetchmail | 6.4.22-r0 | — |
| Alpine v3.17 | fetchmail | 6.4.22-r0 | — |
| Alpine v3.16 | fetchmail | 6.4.22-r0 | — |
| Alpine v3.15 | fetchmail | 6.4.22-r0 | — |
| Alpine v3.14 | fetchmail | 6.4.22-r0 | — |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 2 (CBL-Mariner) | fetchmail | 6.4.22-1 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | fetchmail | 6.4.24-1.el8 | ELSA-2022-1964 |
Advisories 14
- ALSA-2022:1964 Moderate: fetchmail security update AlmaLinux Security Advisories · Oct 29, 2026
- WID-SEC-2022-0432 Xerox FreeFlow Print Server: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 11, 2026
- WID-SEC-2022-0302 Xerox FreeFlow Print Server: Mehrere Schwachstellen ermöglichen Ausführen von beliebigem Programmcode mit Administratorrechten BSI CERT-Bund (WID) · Oct 11, 2026
- RLSA-2022:1964 Moderate: fetchmail security update Rocky Linux Security Advisories · Feb 4, 2026
- openSUSE-SU-2024:11573-1 fetchmail-6.4.22-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:3492-1 Security update for fetchmail SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:3493-1 Security update for fetchmail SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2021:1591-1 Security update for fetchmail SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:4018-1 Security update for fetchmail SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2021:4018-1 Security update for fetchmail SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2021:1416-1 Security update for fetchmail SUSE / openSUSE Security Updates · Feb 4, 2026
- RHSA-2022:1964 Red Hat Security Advisory: fetchmail security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- openSUSE-SU-2021:3493-1 Security update for fetchmail SUSE / openSUSE Security Updates · May 7, 2025
- ELSA-2022-1964 Moderate: fetchmail security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · May 17, 2022
References
- https://www.fetchmail.info/security.html
- https://nostarttls.secvuln.info/
- http://www.openwall.com/lists/oss-security/2021/08/27/3
- FEDORA-2021-ddefbdbb46 vendor-advisory
- FEDORA-2021-9998719311 vendor-advisory
- FEDORA-2021-e61a978fef vendor-advisory
- GLSA-202209-14 vendor-advisory