CVE-2018-6789
CriticalActively exploited (CISA KEV)Known to be used in ransomware campaigns
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.
SeverityCritical
CVSS9.8
Exploit probability—
Product
Exim
PublishedFeb 8, 2018
First seenFeb 8, 2018
Added to KEVNov 3, 2021
Weakness typeCWE-120CWE-120
How to fix
CISA required action
Apply updates per vendor instructions.
CISA due date: May 3, 2022Update
- exim exim4.90.1 or later
Vendor advisories
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| exim exim | v < 4.90.1 | 4.90.1 |
| debian debian_linux | 7.0, 8.0, 9.0 | — |
| canonical ubuntu_linux | 14.04, 16.04, 17.10 | — |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
In the Intelligence 360 plan
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.