CVE-2024-39929

moderate-risk
Published 2024-07-04

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.

Do I need to act?

!
63.9% chance of exploitation in next 30 days
EPSS score — higher than 36% of all CVEs
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
5
CVSS 5.4/10 Medium
NETWORK / LOW complexity

Affected Products (1)

Affected Vendors

Exim

References (10)

Exploit https://bugs.exim.org/show_bug.cgi?id=3099#c4
Patch https://git.exim.org/exim.git/commit/1b3209b0577a9327ebb076f3b32b8a159c253f7b
Patch https://git.exim.org/exim.git/commit/6ce5c70cff8989418e05d01fd2a57703007a6357
Release Notes https://github.com/Exim/exim/compare/exim-4.98-RC2...exim-4.98-RC3
Not Applicable https://www.rfc-editor.org/rfc/rfc2231.txt
Exploit https://bugs.exim.org/show_bug.cgi?id=3099#c4
Patch https://git.exim.org/exim.git/commit/1b3209b0577a9327ebb076f3b32b8a159c253f7b
Patch https://git.exim.org/exim.git/commit/6ce5c70cff8989418e05d01fd2a57703007a6357
Release Notes https://github.com/Exim/exim/compare/exim-4.98-RC2...exim-4.98-RC3
Not Applicable https://www.rfc-editor.org/rfc/rfc2231.txt
45
/ 100
moderate-risk
Severity 21/34 · High
Exploitability 19/34 · Moderate
Exposure 5/34 · Minimal