CVE-2025-67896 is a critical heap-based buffer overflow vulnerability affecting Exim versions prior to 4.99.1 when configured with non-default rate-limiting. This flaw allows a remote, unauthenticated attacker to execute arbitrary code with high impact on confidentiality, integrity, and availability, as reflected by its CVSS score of 9.8. Despite its severity, there is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
>= 4.99, < 4.99.1CPE match | cpe:2.3:a:exim:exim:*:*:*:*:*:*:*:* | ||
< 4.99.1CPE matchmatch criteria | cpe:2.3:a:exim:exim:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L
The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.
exim: Exim: Remote heap corruption vulnerability
Dec 14, 2025Security Advisory for CVE-2025-67896
Security Advisory for CVE-2025-67896