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CVE-2024-39929

Date: July 3, 2024

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.

Language: C

Severity Score

Related Resources (8)

https://git.exim.org/exim.git/commit/6ce5c70cff8989418e05d01fd2a57703007a6357
https://git.exim.org/exim.git/commit/1b3209b0577a9327ebb076f3b32b8a159c253f7b
https://www.rfc-editor.org/rfc/rfc2231.txt
https://nvd.nist.gov/vuln/detail/CVE-2024-39929
https://security-tracker.debian.org/tracker/CVE-2024-39929
https://bugs.exim.org/show_bug.cgi?id=3099#c4
https://github.com/Exim/exim/compare/exim-4.98-RC2...exim-4.98-RC3
https://www.mend.io/vulnerability-database/CVE-2024-39929

Severity Score

Weakness Type (CWE)

Improper Encoding or Escaping of Output

CWE-116

CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): REQUIRED
Scope (S): UNCHANGED
Confidentiality (C): LOW
Integrity (I): LOW
Availability (A): NONE

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