CVE-2023-51765
Fixed in a distro release EPSS 1%
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.
Products: sendmail, freebsd, redhat enterprise_linux
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Amazon Linux 2023 | sendmail | 8.18.2-2.amzn2023.0.1 |
| Amazon Linux 2023 | sendmail-cf | 8.18.2-2.amzn2023.0.1 |
| Amazon Linux 2023 | sendmail-doc | 8.18.2-2.amzn2023.0.1 |
| Amazon Linux 2023 | sendmail-milter | 8.18.2-2.amzn2023.0.1 |
| Amazon Linux 2023 | sendmail-milter-devel | 8.18.2-2.amzn2023.0.1 |
| Debian 10 | sendmail | 8.15.2-14~deb10u2 |
| Debian 12 | sendmail | 8.17.1.9-2+deb12u1 |
| Debian 13 | sendmail | 8.18.1-1 |
| Debian 14 | sendmail | 8.18.1-1 |
| SUSE Linux Enterprise Module for Basesystem 15 SP5 | sendmail | 8.15.2-150000.8.12.1 |
| SUSE Linux Enterprise Module for Legacy 12 | sendmail | 8.14.9-4.9.1 |
| SUSE Linux Enterprise Module for Package Hub 15 SP5 | sendmail | 8.15.2-150000.8.12.1 |
| Ubuntu 14.04 LTS | sendmail | no fix |
| Ubuntu 16.04 LTS | sendmail | no fix |
| Ubuntu 18.04 LTS | sendmail | no fix |
| Ubuntu 20.04 LTS | sendmail | no fix |
| Ubuntu 22.04 LTS | sendmail | no fix |
| openSUSE Leap 15.5 | sendmail | 8.15.2-150000.8.12.1 |