CVE-2018-6789
Exim Buffer Overflow Vulnerability
- Published
- Feb 8, 2018
- Updated
- Oct 21, 2025
- Assigning CNA
- mitre
- Evidence observed
- May 2, 2018
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HHigh · next 30 days
- Percentile
- 99.6%
- Model date
- Sep 21, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
CISA Known Exploited
This CVE appears in the CISA Known Exploited Vulnerabilities catalog.
Summary
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.
Sources
7This repository provides a learning environment to understand how an Exim RCE exploit for CVE-2018-6789 works.
- Exim-CVE-2018-6789Exploit
PoC materials to exploit CVE-2018-6789
- CVE-2018-6789-Python3Exploit
Exim < 4.90.1 RCE Vulnerability remake for Python3 with arguments passed from CLI
Responsible use
Use vulnerability information only on systems you own or are authorized to test. Kitploit links to public research metadata and does not store exploit code or malicious payloads.