November 3, 2021 · Applied Cybernetics Group
CVE-2018-6789 — Exim Exim
known ransomware use
Exim Buffer Overflow Vulnerability
- Added to KEV
2021-11-03- Federal due date
2022-05-03- Vendor
- Exim
- Product
- Exim
- EPSS
- 99.6th percentile (score 0.822, as of
2026-07-13) - NVD CVSS v3.1
- —
- Ransomware use
- Known
- ATT&CK
- T1059 , T1190 · signal rollup
- Upstream
- https://nvd.nist.gov/vuln/detail/CVE-2018-6789
CISA short description
Exim contains a buffer overflow vulnerability in the base64d function part of the SMTP listener that may allow for remote code execution.
Required action
Apply updates per vendor instructions.