sendmail: sendmail through 8.17.2 allows SMTP smuggling in certain configurations
CVE-2023-51765 is fixed in 8 products on 1 platform, first by DEBIAN-CVE-2023-51765, released December 24, 2023. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| sendmail · Debian 12.15 (bookworm) | 8.17.1.9-2+deb12u1 | DEBIAN-CVE-2023-51765 | Dec 24, 2023 |
| sendmail · Debian 13.5 (trixie) | 8.18.1-1 | DEBIAN-CVE-2023-51765 | Dec 24, 2023 |
| sendmail · Debian 14 | 8.18.1-1 | DEBIAN-CVE-2023-51765 | Dec 24, 2023 |
| sendmail · amzn 2023 | 8.18.2-2.amzn2023.0.1 | ALAS2023-2026-1818 | Jun 8, 2026 |
| sendmail-cf · amzn 2023 | 8.18.2-2.amzn2023.0.1 | ALAS2023-2026-1818 | Jun 8, 2026 |
| sendmail-debuginfo · amzn 2023 | 8.18.2-2.amzn2023.0.1 | ALAS2023-2026-1818 | Jun 8, 2026 |
| sendmail-debugsource · amzn 2023 | 8.18.2-2.amzn2023.0.1 | ALAS2023-2026-1818 | Jun 8, 2026 |
| sendmail-doc · amzn 2023 | 8.18.2-2.amzn2023.0.1 | ALAS2023-2026-1818 | Jun 8, 2026 |
| sendmail-milter · amzn 2023 | 8.18.2-2.amzn2023.0.1 | ALAS2023-2026-1818 | Jun 8, 2026 |
| sendmail-milter-debuginfo · amzn 2023 | 8.18.2-2.amzn2023.0.1 | ALAS2023-2026-1818 | Jun 8, 2026 |
| sendmail-milter-devel · amzn 2023 | 8.18.2-2.amzn2023.0.1 | ALAS2023-2026-1818 | Jun 8, 2026 |
Patch Radar data is free to use with attribution. Terms and how to credit it.
Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.