Log in Start free

Vulnerability · Published Dec 24, 2023 · Assigned by mitre

CVE-2023-51765

Medium 5.3

In plain English

A medium-severity security flaw in the sendmail package (Debian). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.1% (higher than 65% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)5.3Medium
Exploit odds (30 days)1.1%top 34.7% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12sendmail8.17.1.9-2+deb12u1DEBIAN-CVE-2023-51765
Debian:13sendmail8.18.1-1DEBIAN-CVE-2023-51765
Debian:14sendmail8.18.1-1DEBIAN-CVE-2023-51765
Ubuntu:22.04:LTSsendmailno fix listedUBUNTU-CVE-2023-51765

Affected products (as reported)

VendorProductVersions
n/a n/a n/a

References