Description
Fetchmail 5.0.8 through 6.3.21, when using NTLM authentication in debug mode, allows remote NTLM servers to (1) cause a denial of service (crash and delayed delivery of inbound mail) via a crafted NTLM response that triggers an out-of-bounds read in the base64 decoder, or (2) obtain sensitive information from memory via an NTLM Type 2 message with a crafted Target Name structure, which triggers an out-of-bounds read.
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 | 6.3.22-1 | — |
| Debian 13 | fetchmail | 6.3.22-1 | — |
| Debian 12 | fetchmail | 6.3.22-1 | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 11 SP4 | fetchmail | 6.3.8.90-13.20.21.1 | SUSE-SU-2016:0872-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 11 SP4 | fetchmail | 6.3.8.90-13.20.21.1 | SUSE-SU-2016:0872-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | fetchmail | 6.3.26-13.4 | openSUSE-SU-2024:10194-1 |
Advisories 2
- SUSE-SU-2016:0872-1 Security update for fetchmail SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:10194-1 fetchmail-6.3.26-13.4 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
References
- [oss-security] 20120813 Re: CVE ID request for fetchmail segfault in NTLM protocol exchange mailing-list
- [oss-security] 20120813 CVE ID request for fetchmail segfault in NTLM protocol exchange mailing-list
- 54987 vdb-entry
- https://blogs.oracle.com/sunsecurity/entry/multiple_vulnerabilities_in_fetchmail
- FEDORA-2012-14451 vendor-advisory
- FEDORA-2012-14462 vendor-advisory
- http://www.fetchmail.info/fetchmail-SA-2012-02.txt