CVE-2024-39929

Exim vulnerability

CVSS

5.4

EPSS

41.2%

EPSS pct

99th

Exploited

No known

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.

Affected vendor

Exim

Affected product

Exim

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

Weakness type (CWE)

CWE-116 — Improper Output Encoding

Published

2024-07-04

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no privileges, user interaction. Successful exploitation leads to low impact to confidentiality, low impact to integrity.

Its EPSS score of 41.2% reflects a moderate probability of exploitation activity in the wild over the next 30 days, placing it among the most exploited CVEs currently tracked.

Check your external exposure to CVE-2024-39929

Confirm whether Exim Exim is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2024-39929.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2024-39929

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2024-39929 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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