ACTIVELY EXPLOITED
CVE-2018-6789: Exim Buffer Overflow Vulnerability
| Vendor | Exim |
|---|---|
| Product | Exim |
| Actively exploited | Yes |
| Added to CISA KEV | 3 Nov 2021 |
| CISA federal deadline | 3 May 2022 |
| Ransomware use | Known |
| Weakness (CWE) | CWE-119 |
Required action (CISA's text)
Apply updates per vendor instructions.
Description (NVD)
Exim contains a buffer overflow vulnerability in the base64d function part of the SMTP listener that may allow for remote code execution.
SOURCES
Other Exim flaws
- CVE-2010-4345: Exim Privilege Escalation Vulnerability
- CVE-2010-4344: Exim Heap-Based Buffer Overflow Vulnerability
- CVE-2019-16928: Exim Out-of-bounds Write Vulnerability
- CVE-2019-10149: Exim Mail Transfer Agent (MTA) Improper Input Validation
Data from NVD, CISA KEV, FIRST EPSS and vendor advisories. Updated 10 Nov 2026.