Medium severity5.3NVD Advisory· Published Dec 24, 2023· Updated Jun 17, 2026
CVE-2023-51765
CVE-2023-51765
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 . but some other popular e-mail servers do not. This is resolved in 8.18 and later versions with 'o' in srv_features.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
6(expand)+ 1 more
- (no CPE)
- (no CPE)range: <=8.17.2
- osv-coords4 versionspkg:rpm/opensuse/sendmail&distro=openSUSE%20Leap%2015.5pkg:rpm/suse/sendmail&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP5pkg:rpm/suse/sendmail&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Legacy%2012pkg:rpm/suse/sendmail&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Package%20Hub%2015%20SP5
< 8.15.2-150000.8.12.1+ 3 more
- (no CPE)range: < 8.15.2-150000.8.12.1
- (no CPE)range: < 8.15.2-150000.8.12.1
- (no CPE)range: < 8.14.9-4.9.1
- (no CPE)range: < 8.15.2-150000.8.12.1
Patches
Vulnerability mechanics
References
17- bugzilla.suse.com/show_bug.cginvdIssue TrackingPatchThird Party Advisory
- github.com/freebsd/freebsd-src/commit/5dd76dd0cc19450133aa379ce0ce4a68ae07fb39nvdPatch
- www.youtube.com/watchnvdExploit
- www.openwall.com/lists/oss-security/2023/12/24/1nvdMailing ListThird Party Advisory
- www.openwall.com/lists/oss-security/2023/12/25/1nvdMailing ListThird Party Advisory
- www.openwall.com/lists/oss-security/2023/12/26/5nvdMailing ListThird Party Advisory
- www.openwall.com/lists/oss-security/2023/12/29/5nvdMailing ListThird Party Advisory
- www.openwall.com/lists/oss-security/2023/12/30/1nvdMailing ListThird Party Advisory
- www.openwall.com/lists/oss-security/2023/12/30/3nvdMailing ListThird Party Advisory
- access.redhat.com/security/cve/CVE-2023-51765nvdThird Party Advisory
- bugzilla.redhat.com/show_bug.cginvdIssue TrackingThird Party Advisory
- sec-consult.com/blog/detail/smtp-smuggling-spoofing-e-mails-worldwide/nvdTechnical DescriptionThird Party Advisory
- www.openwall.com/lists/oss-security/2023/12/21/7nvdMailing ListThird Party Advisory
- www.openwall.com/lists/oss-security/2023/12/22/7nvdMailing ListThird Party Advisory
- fahrplan.events.ccc.de/congress/2023/fahrplan/events/11782.htmlnvdTechnical Description
- lists.debian.org/debian-lts-announce/2024/06/msg00004.htmlnvd
- lwn.net/Articles/956533/nvd
News mentions
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