CVE-2018-6789
9.8
CRITICAL
CVSS 3.1
EPSS 82.1% · 100th pctCISA KEV · Exploited in the wild
2018-02-08•Updated 2025-10-21•KEV 2021-11-03
CISA Known Exploited Vulnerabilities
Exim Buffer Overflow Vulnerability is confirmed as actively exploited and is listed in the CISA KEV catalog.
Added to KEV
2021-11-03
Remediation due
2022-05-03
Ransomware
Known use
Required action
Apply updates per vendor instructions.
CISA notes
https://nvd.nist.gov/vuln/detail/CVE-2018-6789
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.
Severity
CVSS 3.1 · CISA9.8 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HSSVC · CISA-ADP
Exploitationactive
Automatableyes
Technical impacttotal
Affected Products
| Vendor | Product | Affected versions |
|---|---|---|
| - | - | n/a |
References
13 LinksVendor advisories
Mailing lists
Other references
- https://exim.org/static/doc/security/CVE-2018-6789.txt
- http://openwall.com/lists/oss-security/2018/02/10/2
- https://git.exim.org/exim.git/commit/cf3cd306062a08969c41a1cdd32c6855f1abecf1
- https://devco.re/blog/2018/03/06/exim-off-by-one-RCE-exploiting-CVE-2018-6789-en/
- http://packetstormsecurity.com/files/162959/Exim-base64d-Buffer-Overflow.html
Record Details
Published
2018-02-08
Last updated
2025-10-21
Assigner (CNA)
mitre
Credited to
-
CVE record data © The MITRE Corporation, used under the CVE Terms of Use. Exploited-in-the-wild data from the CISA Known Exploited Vulnerabilities catalog (CC0). Exploit prediction scores by FIRST EPSS (first.org/epss). This site is not endorsed or certified by MITRE, NVD, CISA, or FIRST.