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.
02 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.
03 Exploitation and scoring
- Exploitation
- Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
- SSVC decision
- ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
- AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
- Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
- EPSS probability
- 0.47% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 40.3% of scored records. A rank, not a probability.
- NVD base score
- 9.8 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- NVD analysis status
- Analyzed. NVD last modified this record on 2026-10-14.
- Red Hat severity
- Moderate. Red Hat's rating for its own products, not a CVSS rating.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2025-12-14 04:00Z10 MO AGO
- Last updated
- 2025-12-18 23:04Z10 MO AGO
- Reserved
- 2025-12-14
- Assigning CNA
- mitre
- Record state
- PUBLISHED
- Severity
- High (CVSS 7.0)
- CNA CVSS vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L
- Weaknesses
- Data version
- 5.2
- Document digest
- 3dfba03e376482e0bec2b42fd343f09bd8eebf8210a2685f890b74aaf20f3a71
05 Affected products
06 References
- www.openwall.comhttps://www.openwall.com/lists/oss-security/2025/12/11/2
- exim.orghttps://exim.org/static/doc/security/
- exim.orghttps://exim.org/static/doc/security/EXIM-Security-2025-12-09.1/report.txt
- www.openwall.comhttp://www.openwall.com/lists/oss-security/2025/12/14/1
- www.openwall.comhttp://www.openwall.com/lists/oss-security/2025/12/18/3
07 Fixed in
Debian 14
- exim4 Fixed in 4.99-7
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.