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CVE-2018-6789Exim Buffer Overflow Vulnerability
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.
9.8 CRITICALEPSS 82.13%⚡ Known Exploited (CISA KEV)NVD: Analyzed
Overview
Severity
| Score | Severity | Version | Vector String |
|---|---|---|---|
| 9.8 | CRITICAL | 3.1NVD | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| 7.5 | HIGH | 2.0NVD | AV:N/AC:L/Au:N/C:P/I:P/A:P |
CISA required action
⚡ Known exploited · remediation due May 3, 2022
Apply updates per vendor instructions.
Details
- CVE ID
- CVE-2018-6789
- Status
- Analyzed
- Assigner (CNA)
- mitre
- Published
- Feb 8, 2018
- Last modified
- 2026-06-17 02:02 UTC
Affected Products
From NVD CPE configurations.
eximexim1 version range
- before 4.90.1
debiandebian linux3 version ranges
- 7.0
- 8.0
- 9.0
canonicalubuntu linux3 version ranges
- 14.04
- 16.04
- 17.10
References
- openwall.com http://openwall.com/lists/oss-security/2018/02/10/2
- packetstormsecurity.com http://packetstormsecurity.com/files/162959/Exim-base64d-Buffer-Overflow.html
- openwall.com http://www.openwall.com/lists/oss-security/2018/02/07/2
- securityfocus.com http://www.securityfocus.com/bid/103049
- securitytracker.com http://www.securitytracker.com/id/1040461
- devco.re https://devco.re/blog/2018/03/06/exim-off-by-one-RCE-exploiting-CVE-2018-6789-en/
- exim.org https://exim.org/static/doc/security/CVE-2018-6789.txt
- git.exim.org https://git.exim.org/exim.git/commit/cf3cd306062a08969c41a1cdd32c6855f1abecf1
- lists.debian.org https://lists.debian.org/debian-lts-announce/2018/02/msg00009.html
- usn.ubuntu.com https://usn.ubuntu.com/3565-1/
- debian.org https://www.debian.org/security/2018/dsa-4110
- exploit-db.com https://www.exploit-db.com/exploits/44571/
- exploit-db.com https://www.exploit-db.com/exploits/45671/
- cisa.gov https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-6789