Description
Format string vulnerability in the dkim_exim_verify_finish function in src/dkim.c in Exim before 4.76 might allow remote attackers to execute arbitrary code or cause a denial of service (daemon crash) via format string specifiers in data used in DKIM logging, as demonstrated by an identity field containing a % (percent) character.
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 | exim4 | 4.75-3 | — |
| Debian 13 | exim4 | 4.75-3 | — |
| Debian 12 | exim4 | 4.75-3 | — |
| Debian 6.0 | exim4 | 4.72-6+squeeze1 | DSA-2232-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | exim | 4.86.2-2.2 | openSUSE-SU-2024:10017-1 |
Advisories 2
- DSA-2232-1 exim4 - format string vulnerability Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2024:10017-1 exim-4.86.2-2.2 on GA media SUSE / openSUSE Security Updates · May 7, 2025
References
- 51155 third-party-advisory
- SUSE-SR:2011:009 vendor-advisory
- DSA-2232 vendor-advisory
- http://git.exim.org/exim.git/commit/337e3505b0e6cd4309db6bf6062b33fa56e06cf8
- https://bugzilla.redhat.com/show_bug.cgi?id=702474
- http://bugs.exim.org/show_bug.cgi?id=1106
- http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=624670