Description
sendmail through 8.17.2 allows SMTP smuggling in certain 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 sendmail supports <LF>.<CR><LF> but some other popular e-mail servers do not. This is resolved in 8.18 and later versions with 'o' in srv_features.
Scores
CVSS v3
5.3
EPSS
0.0084
EPSS Percentile
74.7%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Details
CWE
CWE-345
Status
published
Products (4)
freebsd/freebsd
< 11.0
redhat/enterprise_linux
8.0
redhat/enterprise_linux
9.0
sendmail/sendmail
< 8.18.0.2
Published
Dec 24, 2023
Tracked Since
Feb 18, 2026