Description
Exim before 4.87.1 might allow remote attackers to obtain the private DKIM signing key via vectors related to log files and bounce messages.
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 | 4.88~RC6-2 | — |
| Debian 13 | exim4 | 4.88~RC6-2 | — |
| Debian 12 | exim4 | 4.88~RC6-2 | — |
| Debian 8 | exim4 | 4.84.2-2+deb8u2 | DSA-3747-1 |
| Debian 7 | exim4 | 4.80-7+deb7u4 | DLA-762-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | exim4 | 4.86.2-2ubuntu2.1 | USN-3164-1 |
| Ubuntu 14.04 LTS | exim4 | 4.82-3ubuntu2.2 | USN-3164-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | exim | 4.94.2-4.2 | openSUSE-SU-2024:10746-1 |
Advisories 4
- USN-3164-1 exim4 vulnerability Ubuntu Security Notices (USN) · Apr 22, 2026
- DLA-762-1 exim4 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-3747-1 exim4 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2024:10746-1 exim-4.94.2-4.2 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
References
- DSA-3747 vendor-advisory
- http://www.exim.org/static/doc/CVE-2016-9963.txt
- USN-3164-1 vendor-advisory
- https://bugs.exim.org/show_bug.cgi?id=1996
- 1037484 vdb-entry
- 94947 vdb-entry