Description
Exim 4 before 4.94.2 has Improper Neutralization of Line Delimiters, relevant in non-default configurations that enable Delivery Status Notification (DSN). Certain uses of ORCPT= can place a newline into a spool header file, and indirectly allow unauthenticated remote attackers to execute arbitrary commands as root.
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 | 4.94.2-1 | — |
| Debian 13 | exim4 | 4.94.2-1 | — |
| Debian 12 | exim4 | 4.94.2-1 | — |
| Debian 10 | exim4 | 4.92-8+deb10u6 | DSA-4912-1 |
| Debian 9 | exim4 | 4.89-2+deb9u8 | DLA-2650-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | exim4 | 4.93-13ubuntu1.5 | USN-4934-1 |
| Ubuntu 18.04 LTS | exim4 | 4.90.1-1ubuntu1.8 | USN-4934-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 16.04 LTS | exim4 | 4.86.2-2ubuntu2.6+esm1 | USN-4934-2 |
| Ubuntu Pro 14.04 LTS | exim4 | 4.82-3ubuntu2.4+esm3 | USN-4934-2 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SUSE Package Hub 15 SP2 | exim | 4.94.2-bp152.6.4.1 | openSUSE-SU-2021:0754-1 |
| SUSE Package Hub 15 SP2 | libspf2 | 1.2.10-bp152.5.1 | openSUSE-SU-2021:0754-1 |
| SUSE Package Hub 15 SP1 | exim | 4.94.2-bp151.2.4.1 | openSUSE-SU-2021:0753-1 |
| SUSE Package Hub 15 SP1 | libspf2 | 1.2.10-bp151.4.1 | openSUSE-SU-2021:0753-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | exim | 4.94.2-4.2 | openSUSE-SU-2024:10746-1 |
| openSUSE Leap 15.2 | exim | 4.94.2-lp152.8.3.1 | openSUSE-SU-2021:0677-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | exim | 4.94.2-r0 | — |
| Alpine v3.23 | exim | 4.94.2-r0 | — |
| Alpine v3.22 | exim | 4.94.2-r0 | — |
| Alpine v3.21 | exim | 4.94.2-r0 | — |
| Alpine v3.20 | exim | 4.94.2-r0 | — |
Show 7 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | exim | 4.94.2-r0 | — |
| Alpine v3.18 | exim | 4.94.2-r0 | — |
| Alpine v3.17 | exim | 4.94.2-r0 | — |
| Alpine v3.16 | exim | 4.94.2-r0 | — |
| Alpine v3.15 | exim | 4.94.2-r0 | — |
| Alpine v3.14 | exim | 4.94.2-r0 | — |
| Alpine v3.13 | exim | 4.94.2-r0 | — |
Advisories 8
- USN-4934-2 exim4 vulnerabilities Ubuntu Security Notices (USN) · Jun 29, 2026
- USN-4934-1 exim4 vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-4912-1 exim4 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2650-1 exim4 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2021:0754-1 Security update for exim SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:10746-1 exim-4.94.2-4.2 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2021:0677-1 Security update for exim SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2021:0753-1 Security update for exim SUSE / openSUSE Security Updates · Feb 4, 2026