CVE-2018-6789
Publication date 7 February 2018
Last updated 25 August 2025
Ubuntu priority
Description
An issue was discovered in the base64d function in the SMTP listener in Exim before 4.90.1. By sending a handcrafted message, a buffer overflow may happen. This can be used to execute code remotely.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| exim4 | ||
| 16.04 LTS xenial |
Fixed 4.86.2-2ubuntu2.3
|
|
| 14.04 LTS trusty |
Fixed 4.82-3ubuntu2.4
|
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score |
9.8 · Critical
|
| Attack vector | Network |
| Attack complexity | Low |
| Privileges required | None |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | High |
| Integrity impact | High |
| Availability impact | High |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
References
Related Ubuntu Security Notices (USN)
- USN-3565-1
- Exim vulnerability
- 12 February 2018