Vulnerability in Exim
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.412 (98.6th percentile), scored .
Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 99th percentile — 98.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.412 · newest: 0.412 · change: 0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- git.exim.org/exim.git/commit/6ce5c70cff8989418e05d01fd2a57703007a6357 (Patch)
- git.exim.org/exim.git/commit/1b3209b0577a9327ebb076f3b32b8a159c253f7b (Patch)
- github.com/Exim/exim/compare/exim-4.98-RC2...exim-4.98-RC3 (Release Notes)
- www.rfc-editor.org/rfc/rfc2231.txt (Not Applicable)
- bugs.exim.org/show_bug.cgi (Exploit, Vendor Advisory)
Frequently asked questions
- What is CVE-2024-39929?
- CVE-2024-39929 is a medium-severity vulnerability in Exim, classified under Improper Encoding or Escaping of Output. CVSS score: 5.4/10. Published 2024-07-04.
- How severe is CVE-2024-39929?
- Medium severity. CVSS v3 base score is 5.4 out of 10.
- Is CVE-2024-39929 known to be exploited?
- 8 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.