CVE-2023-51766
MEDIUM5.3EPSS 1.6%exim4 - security update
Published: 12/24/2023Modified: 4/28/2026
Description
Exim before 4.97.1 allows SMTP smuggling in certain PIPELINING/CHUNKING configurations. Remote attackers can use a published exploitation technique to inject e-mail messages with a spoofed MAIL FROM address, allowing bypass of an SPF protection mechanism. This occurs because Exim supports <LF>.<CR><LF> but some other popular e-mail servers do not.
Affected packages (3)
- Debian/exim4from 0, < 4.94.2-7+deb11u2
- Debian/exim4from 0, < 4.92-8+deb10u9
- Debian/exim4from 0, < 4.94.2-7+deb11u2
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N |