CVE-2024-39929

Published: Jul 4, 2024Modified: Jul 10, 2025

5.4

Vector

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

Exploitability: 2.8 / Impact: 2.5

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary)

Description

Exim through 4.97.1 misparses a multiline RFC 2231 header filename, and thus remote attackers can bypass a $mime_filename extension-blocking protection mechanism, and potentially deliver executable attachments to the mailboxes of end users.

Affected (1)

Products: Exim: Exim

Exim

1 product

Exim

Configuration A

1 vulnerable

Vulnerable Software	Affected Versions
Exim Exim	Up to 4.97.1

Related CWEs

CWE-116

Improper Encoding or Escaping of Output

The product prepares a structured message for communication with another component, but encoding or escaping of the data is either missing or done incorrectly. As a result, the intended structure of the message is not preserved.

References (10)

https://bugs.exim.org/show_bug.cgi?id=3099#c4

Source: cve@mitre.org

ExploitVendor Advisory

https://git.exim.org/exim.git/commit/1b3209b0577a9327ebb076f3b32b8a159c253f7b

Source: cve@mitre.org

Patch

https://git.exim.org/exim.git/commit/6ce5c70cff8989418e05d01fd2a57703007a6357

Source: cve@mitre.org

Patch

https://github.com/Exim/exim/compare/exim-4.98-RC2...exim-4.98-RC3

Source: cve@mitre.org

Release Notes

https://www.rfc-editor.org/rfc/rfc2231.txt

Source: cve@mitre.org

Not Applicable

https://bugs.exim.org/show_bug.cgi?id=3099#c4