CVE-2024-39929

Name: CVE-2024-39929
Creator: NVD / NIST
Published: 2024-07-04T15:15:10.323+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.4/10EPSS 41.23%

Last modified Jun 17, 2026

CVE-2024-39929 is a medium-severity vulnerability rated 5.4/10 on the CVSS scale. 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.. EPSS estimates a 41.23% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

5.4/10

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

EPSS Probability

41.23%

98.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-116

Affected Software

Vendor	Product	Versions
Exim	Exim	<= 4.97.1

References

https://bugs.exim.org/show_bug.cgi?id=3099#c4Exploit, Vendor Advisory
https://git.exim.org/exim.git/commit/1b3209b0577a9327ebb076f3b32b8a159c253f7bPatch
https://git.exim.org/exim.git/commit/6ce5c70cff8989418e05d01fd2a57703007a6357Patch
https://github.com/Exim/exim/compare/exim-4.98-RC2...exim-4.98-RC3Release Notes
https://www.rfc-editor.org/rfc/rfc2231.txtNot Applicable
https://bugs.exim.org/show_bug.cgi?id=3099#c4Exploit, Vendor Advisory
https://git.exim.org/exim.git/commit/1b3209b0577a9327ebb076f3b32b8a159c253f7bPatch
https://git.exim.org/exim.git/commit/6ce5c70cff8989418e05d01fd2a57703007a6357Patch
https://github.com/Exim/exim/compare/exim-4.98-RC2...exim-4.98-RC3Release Notes
https://www.rfc-editor.org/rfc/rfc2231.txtNot Applicable

Timeline

Published: Jul 4, 2024
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2024-39929?

How severe is CVE-2024-39929?

CVE-2024-39929 has a CVSS score of 5.4/10 (MEDIUM severity). The EPSS model estimates a 41.23% probability of exploitation in the next 30 days.

How do I fix CVE-2024-39929?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2024-39929?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST