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.

• CWE-116

• 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

Published

Jul 4, 2024

Last Modified

Jun 17, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
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