CVE-2025-67896

EUVD-2025-203281
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
7 HIGH
NETWORK
HIGH
NONE
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L
mitreCNA
7 HIGH
NETWORK
HIGH
NONE
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L
Base Score
CVSS 3.x
EPSS Score
Percentile: 24%
Affected Products (NVD)
VendorProductVersion
eximexim
𝑥
< 4.99.1
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
exim4
bookworm
4.96-15+deb12u7
not-affected
bookworm (security)
4.96-15+deb12u7
fixed
bullseye
4.94.2-7+deb11u3
not-affected
bullseye (security)
4.94.2-7+deb11u4
fixed
forky
4.99.1-1
fixed
sid
4.99.1-1
fixed
trixie
4.98.2-1
not-affected
Common Weakness Enumeration
References
https://exim.org/static/doc/security/
https://exim.org/static/doc/security/EXIM-Security-2025-12-09.1/report.txt
https://www.openwall.com/lists/oss-security/2025/12/11/2
http://www.openwall.com/lists/oss-security/2025/12/14/1
http://www.openwall.com/lists/oss-security/2025/12/18/3