VulnerabilityAnalyzed
CVE-2025-67896
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.
CRITICAL 9.8EPSS 0.47%
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.47%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.47% probability · 40th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-122
- Affected
- exim/exim
- Source
- cve@mitre.org
References
- https://exim.org/static/doc/security/Vendor Advisory
- https://exim.org/static/doc/security/EXIM-Security-2025-12-09.1/report.txtVendor Advisory
- https://www.openwall.com/lists/oss-security/2025/12/11/2Mailing List
- http://www.openwall.com/lists/oss-security/2025/12/14/1Mailing List
- http://www.openwall.com/lists/oss-security/2025/12/18/3Mailing List
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.