CVE-2024-39929

Publication date 4 July 2024

Last updated 26 August 2025

Ubuntu priority

Cvss 3 Severity Score

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.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
exim4	24.04 LTS noble	Fixed 4.97-4ubuntu4.1
	23.10 mantic	Ignored end of life, was needs-triage
	22.04 LTS jammy	Fixed 4.95-4ubuntu2.6
	20.04 LTS focal	Fixed 4.93-13ubuntu1.12
	18.04 LTS bionic	Fixed 4.90.1-1ubuntu1.10+esm5
	16.04 LTS xenial	Fixed 4.86.2-2ubuntu2.6+esm8
	14.04 LTS trusty	Not affected

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Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
exim4	Upstream: 6ce5c70 Upstream: 1b3209b

Severity score breakdown

Parameter	Value
Base score	5.4 · Medium
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	Required
Scope	Unchanged
Confidentiality	Low
Integrity impact	Low
Availability impact	None
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

References

Related Ubuntu Security Notices (USN)

USN-6939-1
Exim vulnerability
31 July 2024