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    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.

    Published:Dec 18, 2023
    Last Modified:Nov 21, 2024
    EPS:Dec 24, 2023
    EPSS Score:0.00466
    CVSS Score:5.3

    Affected Products

    Vendor
    Freebsd
    Product
    Freebsd
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Sendmail
    Product
    Sendmail

    Exploits

    https://www.youtube.com/watch?v=V8KPV96g1Tohttps://www.youtube.com/watch?v=V8KPV96g1To

    Related CVEs

    CVE-2026-58094 (CVSS 7.8) — The FIOSSHMLPGCNF ioctl(2) operation configures the page size for a largepage shared memory object. This is i…
    CVE-2026-58093 (CVSS 7) — The TIOCSCTTY ioctl handler drops the tty lock in order to acquire the process tree lock. After reacquiring t…
    CVE-2026-58097 (CVSS 7.8) — mp_SetEnddisc() copied a user-supplied PSN endpoint value without length validation, allowing a buffer overflo…
    CVE-2026-58096 (CVSS 8.8) — LcpDecodeConfig() did not validate the length of received endpoint discriminator options against the minimum r…
    CVE-2026-58095 (CVSS 8.8) — mp_Enddisc() used incorrect length calculations when formatting endpoint discriminator addresses for display, …
    CVE-2026-58092 (CVSS 8.1) — In FreeBSD 15.0, the kernel structure used to represent user credentials changed: previously the primary group…
    CVE-2026-58091 (CVSS 7.8) — The implementation of this ioctl attempts to acquire locks on all channels in a sync group. If locking a chan…
    CVE-2026-58090 (CVSS 7.8) — The SOCK_STREAM receive path in the unix socket implementation failed to fully detach control messages from th…
    CVE-2026-58089 (CVSS 7.8) — When a process calls execve(2) to execute a setuid or setgid image, hwpmc(4) is supposed to detach PMCs owned …
    CVE-2026-58088 (CVSS 7.4) — The ELF core dump code counted the number of dumpable VM map entries, allocated a buffer for the corresponding…

    References

    http://www.openwall.com/lists/oss-security/2023/12/24/1
    http://www.openwall.com/lists/oss-security/2023/12/25/1
    http://www.openwall.com/lists/oss-security/2023/12/26/5
    http://www.openwall.com/lists/oss-security/2023/12/29/5
    http://www.openwall.com/lists/oss-security/2023/12/30/1
    http://www.openwall.com/lists/oss-security/2023/12/30/3
    https://access.redhat.com/security/cve/CVE-2023-51765
    https://bugzilla.redhat.com/show_bug.cgi?id=2255869
    https://bugzilla.suse.com/show_bug.cgi?id=1218351
    https://fahrplan.events.ccc.de/congress/2023/fahrplan/events/11782.html
    https://github.com/freebsd/freebsd-src/commit/5dd76dd0cc19450133aa379ce0ce4a68ae07fb39#diff-afdf514b32ac88004952c11660c57bc96c3d8b2234007c1cbd8d7ed7fd7935cc
    https://lists.debian.org/debian-lts-announce/2024/06/msg00004.html
    https://lwn.net/Articles/956533/
    https://sec-consult.com/blog/detail/smtp-smuggling-spoofing-e-mails-worldwide/
    https://www.openwall.com/lists/oss-security/2023/12/21/7
    https://www.openwall.com/lists/oss-security/2023/12/22/7
    https://www.youtube.com/watch?v=V8KPV96g1To
    http://www.openwall.com/lists/oss-security/2023/12/24/1
    http://www.openwall.com/lists/oss-security/2023/12/25/1
    http://www.openwall.com/lists/oss-security/2023/12/26/5
    http://www.openwall.com/lists/oss-security/2023/12/29/5
    http://www.openwall.com/lists/oss-security/2023/12/30/1
    http://www.openwall.com/lists/oss-security/2023/12/30/3
    https://access.redhat.com/security/cve/CVE-2023-51765
    https://bugzilla.redhat.com/show_bug.cgi?id=2255869
    https://bugzilla.suse.com/show_bug.cgi?id=1218351
    https://fahrplan.events.ccc.de/congress/2023/fahrplan/events/11782.html
    https://github.com/freebsd/freebsd-src/commit/5dd76dd0cc19450133aa379ce0ce4a68ae07fb39#diff-afdf514b32ac88004952c11660c57bc96c3d8b2234007c1cbd8d7ed7fd7935cc
    https://lists.debian.org/debian-lts-announce/2024/06/msg00004.html
    https://lwn.net/Articles/956533/
    https://sec-consult.com/blog/detail/smtp-smuggling-spoofing-e-mails-worldwide/
    https://www.openwall.com/lists/oss-security/2023/12/21/7
    https://www.openwall.com/lists/oss-security/2023/12/22/7
    https://www.youtube.com/watch?v=V8KPV96g1To

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High