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.

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.

EPSS: 0.412 (98.5th percentile) — read the EPSS interpretation.

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.

Affected products

Exim
N/a — versions n/a

Weakness classification (CWE)

CWE-116 — Improper Encoding or Escaping of Output

Public proof-of-concept exploits

References

cve@mitre.org (Patch)
cve@mitre.org (Patch)
cve@mitre.org (Release Notes)
cve@mitre.org (Not Applicable)
cve@mitre.org (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.