CVE-2023-51765

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.

Affected products

Alt Linux, Astra Linux, Ibm Aix, Red Os, Suse, Sendmail

Sendmail

< 8.18.0.2

Fix

Available

CVSS 3.1

5.3 MEDIUM

EPSS

1.1% (62th percentile)

Weakness

CWE-345

NVD status

Modified

Published

2023-12-24