AEGLIX vulnerability intelligence
CVE-2018-6789
CRITICAL · CVSS 9.8 · Analyzed
Published: 2018-02-08 · Updated: 2026-06-17 · Source: NVD
Vulnerability overview
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 and scoring
- CVSS score
- 9.8 · CRITICAL
- CVSS version
- 3.1
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weaknesses
- CWE-120
CVSS measures technical severity; it does not establish whether this vulnerability is being exploited in your environment.
Known exploitation and remediation
Listed in CISA’s Known Exploited Vulnerabilities catalog.
- Affected product
- Exim · Exim
- Added to catalog
- 2021-11-03
- Required action
- Apply updates per vendor instructions.
- CISA remediation due date
- 2022-05-03
CISA deadlines apply to the organizations covered by its directives. Confirm your own remediation requirements.
Verify affected versions and patch availability in the vendor advisory before making changes.
Affected products and versions
cpe:2.3:a:exim:exim:*:*:*:*:*:*:*:*
Before (exclusive): 4.90.1
cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:esm:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:17.10:*:*:*:*:*:*:*
These are NVD CPE applicability entries. Some products depend on configuration conditions; consult the official record to confirm applicability.
Advisories and references
- http://openwall.com/lists/oss-security/2018/02/10/2
Mailing List · Third Party Advisory
- http://packetstormsecurity.com/files/162959/Exim-base64d-Buffer-Overflow.html
Exploit · Third Party Advisory · VDB Entry
- http://www.openwall.com/lists/oss-security/2018/02/07/2
Mailing List · Third Party Advisory
- http://www.securityfocus.com/bid/103049
Broken Link · Third Party Advisory · VDB Entry
- http://www.securitytracker.com/id/1040461
Broken Link · Third Party Advisory · VDB Entry
- https://devco.re/blog/2018/03/06/exim-off-by-one-RCE-exploiting-CVE-2018-6789-en/
Exploit · Third Party Advisory
- https://exim.org/static/doc/security/CVE-2018-6789.txt
Vendor Advisory
- https://git.exim.org/exim.git/commit/cf3cd306062a08969c41a1cdd32c6855f1abecf1
Patch
- https://lists.debian.org/debian-lts-announce/2018/02/msg00009.html
Mailing List · Third Party Advisory
- https://usn.ubuntu.com/3565-1/
Third Party Advisory
- https://www.debian.org/security/2018/dsa-4110
Mailing List · Third Party Advisory
- https://www.exploit-db.com/exploits/44571/
Exploit · Third Party Advisory · VDB Entry
- https://www.exploit-db.com/exploits/45671/
Exploit · Third Party Advisory · VDB Entry
- http://openwall.com/lists/oss-security/2018/02/10/2
Mailing List · Third Party Advisory
- http://packetstormsecurity.com/files/162959/Exim-base64d-Buffer-Overflow.html
Exploit · Third Party Advisory · VDB Entry
- http://www.openwall.com/lists/oss-security/2018/02/07/2
Mailing List · Third Party Advisory
- http://www.securityfocus.com/bid/103049
Broken Link · Third Party Advisory · VDB Entry
- http://www.securitytracker.com/id/1040461
Broken Link · Third Party Advisory · VDB Entry
- https://devco.re/blog/2018/03/06/exim-off-by-one-RCE-exploiting-CVE-2018-6789-en/
Exploit · Third Party Advisory
- https://exim.org/static/doc/security/CVE-2018-6789.txt
Vendor Advisory
- https://git.exim.org/exim.git/commit/cf3cd306062a08969c41a1cdd32c6855f1abecf1
Patch
- https://lists.debian.org/debian-lts-announce/2018/02/msg00009.html
Mailing List · Third Party Advisory
- https://usn.ubuntu.com/3565-1/
Third Party Advisory
- https://www.debian.org/security/2018/dsa-4110
Mailing List · Third Party Advisory
- https://www.exploit-db.com/exploits/44571/
Exploit · Third Party Advisory · VDB Entry
- https://www.exploit-db.com/exploits/45671/
Exploit · Third Party Advisory · VDB Entry
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-6789
US Government Resource