CVE-2018-6789

9.8 CRITICAL CISA KEV - Actively Exploited

Published: February 08, 2018 Modified: November 07, 2025

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.

AI Explanation

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CVSS v3.x Details

0.0 Low Medium High Critical 10.0

Vector String

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory

http://openwall.com/lists/oss-security/2018/02/10/2

Source: cve@mitre.org

Mailing List Third Party Advisory

http://packetstormsecurity.com/files/162959/Exim-base64d-Buffer-Overflow.html

Source: cve@mitre.org

Exploit Third Party Advisory VDB Entry

http://www.openwall.com/lists/oss-security/2018/02/07/2

Source: cve@mitre.org

Mailing List Third Party Advisory

http://www.securityfocus.com/bid/103049

Source: cve@mitre.org

Broken Link Third Party Advisory VDB Entry

http://www.securitytracker.com/id/1040461

Source: cve@mitre.org

Broken Link Third Party Advisory VDB Entry

https://devco.re/blog/2018/03/06/exim-off-by-one-RCE-exploiting-CVE-2018-6789-en/

Source: cve@mitre.org

Exploit Third Party Advisory

https://exim.org/static/doc/security/CVE-2018-6789.txt

Source: cve@mitre.org

Vendor Advisory

https://git.exim.org/exim.git/commit/cf3cd306062a08969c41a1cdd32c6855f1abecf1

Source: cve@mitre.org

Patch

https://lists.debian.org/debian-lts-announce/2018/02/msg00009.html

Source: cve@mitre.org

Mailing List Third Party Advisory

https://usn.ubuntu.com/3565-1/

Source: cve@mitre.org

Third Party Advisory

https://www.debian.org/security/2018/dsa-4110

Source: cve@mitre.org

Mailing List Third Party Advisory

https://www.exploit-db.com/exploits/44571/

Source: cve@mitre.org

Exploit Third Party Advisory VDB Entry

https://www.exploit-db.com/exploits/45671/

Source: cve@mitre.org

Exploit Third Party Advisory VDB Entry

http://openwall.com/lists/oss-security/2018/02/10/2