CVE-2025-67896 — Heap-based Buffer Overflow in Exim

CWE-122 — Heap-based Buffer OverflowCWE-825 — Expired Pointer Dereference8 documents7 sources
Severity
9.8CRITICALNVD
CNA7.0
EPSS
0.1%
top 70.25%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
1
Exim
Timeline
PublishedDec 14

Description

Exim before 4.99.1, with certain non-default rate-limit configurations, allows a remote heap-based buffer overflow because database records are cast directly to internal structures without validation.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HExploitability: 3.9 | Impact: 5.9

Affected Packages2 packages

▶CVEListV5exim/exim4.99 — 4.99.1
▶NVDexim/exim< 4.99.1

🔴Vulnerability Details

4
OSV
CVE-2025-67896: Exim before 4↗2025-12-14
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OSV
CVE-2025-67896: Exim before 4↗2025-12-14
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CVEList
CVE-2025-67896: Exim before 4↗2025-12-14
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GHSA
GHSA-6qxw-x3vc-phrg: Exim before 4↗2025-12-14
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📋Vendor Advisories

2
Red Hat
exim: Exim: Remote heap corruption vulnerability↗2025-12-14
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Debian
CVE-2025-67896: exim4 - Exim before 4.99.1, with certain non-default rate-limit configurations, allows a...↗2025
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🕵️Threat Intelligence

1
Wiz
CVE-2025-67896 Impact, Exploitability, and Mitigation Steps | Wiz↗
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