What’s Vulnerable › Vulnerabilities

CVE-2024-39929

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 41.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2024-07-04 · updated 2026-06-17
• Weakness: CWE-116

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 products

• Exim: through 4.97.1

References

• https://bugs.exim.org/show_bug.cgi?id=3099#c4
• https://git.exim.org/exim.git/commit/1b3209b0577a9327ebb076f3b32b8a159c253f7b
• https://git.exim.org/exim.git/commit/6ce5c70cff8989418e05d01fd2a57703007a6357
• https://github.com/Exim/exim/compare/exim-4.98-RC2...exim-4.98-RC3
• https://www.rfc-editor.org/rfc/rfc2231.txt
• https://bugs.exim.org/show_bug.cgi?id=3099#c4
• https://git.exim.org/exim.git/commit/1b3209b0577a9327ebb076f3b32b8a159c253f7b
• https://git.exim.org/exim.git/commit/6ce5c70cff8989418e05d01fd2a57703007a6357
• https://github.com/Exim/exim/compare/exim-4.98-RC2...exim-4.98-RC3
• https://www.rfc-editor.org/rfc/rfc2231.txt

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