VulnerabilityAnalyzed

CVE-2024-39929

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.

MEDIUM 5.4EPSS 41.5%

Does this matter?

EPSS puts the probability of exploitation in the next 30 days at 41.5%, higher than 99% of all known CVEs. Patch or mitigate before the next change window.

Description

CVSS 3.1: 5.4 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
EPSS: 41.49% probability · 99th percentile
Public exploits: None in Exploit-DB
CISA KEV: Not listed
Weakness: CWE-116
Affected: exim/exim
Source: cve@mitre.org

EPSS trend

EPSS 41.5% since 3 November 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.

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

Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.