CVE-2023-51765

mediumpriority · track · 21OT risk · elevatedEPSS 0.011 · 65 %ileDEEURUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

1.08% (65th) EPSS

CVSS 5.3 · medium

Is it mine?

27 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · fstec_bdu · cert_bund

EPSS · scored 2026-10-27

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.

cvss

Technical severity, 0–10. One row per scoring source.

5.3

010

base score 0–10 · higher = more severe · hover a vector to decode

v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:Nprimary · NVD / NIST USexploitability 3.9 · impact 1.4

v3.15.3mediumAV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:Nsecondary · FSTEC (BDU) RU

v3.14.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-345USprimaryCWE-345US

affected products (27)

Products and version ranges known to be affected.

Amazon Linux 2all versionscert_bundDEcpe:/o:amazon:linux_2:-
Debian Linuxall versionscert_bundDEcpe:/o:debian:debian_linux:-
Dell NetWorkerall versionscert_bundDEcpe:/a:dell:networker:-
EMC Avamarall versionscert_bundDEcpe:/a:emc:avamar:-
Fedora Linuxall versionscert_bundDEcpe:/o:fedoraproject:fedora:-
IBM AIX 7.2all versionscert_bundDEcpe:/o:ibm:aix:7.2
IBM AIX 7.3all versionscert_bundDEcpe:/o:ibm:aix:7.3
IBM VIOS 3.1all versionscert_bundDEcpe:/a:ibm:vios:3.1
IBM VIOS 4.1all versionscert_bundDEcpe:/a:ibm:vios:4.1
Open Source Eximall versionscert_bundDEcpe:/a:exim:exim:-
Open Source sendmailall versionscert_bundDEcpe:/a:sendmail:sendmail:-
Red Hat Enterprise Linuxall versionscert_bundDEcpe:/o:redhat:enterprise_linux:-
SUSE Linuxall versionscert_bundDEcpe:/o:suse:suse_linux:-
Ubuntu Linuxall versionscert_bundDEcpe:/o:canonical:ubuntu_linux:-
Xerox FreeFlow Print Server v7all versionscert_bundDEcpe:/a:xerox:freeflow_print_server:v7
Xerox FreeFlow Print Server v9all versionscert_bundDEcpe:/a:xerox:freeflow_print_server:v9
Open Source Postfix< 3.9cert_bundDE
n/a n/a≤ n/aenisa_euvdEU
FreeBSD Project FreeBSD≤ 11.0fstec_bduRU
Red Hat Inc. Red Hat Enterprise Linux≤ 9.0fstec_bduRU

showing 20 of 27

advisories (2)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2023-3206SMTP Implementierungen: Schwachstelle ermöglicht Umgehen von SicherheitsvorkehrungenDeutsch2023-12-21csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann eine Schwachstelle in verschiedenen SMTP Implementierungen ausnutzen, um Sicherheitsvorkehrungen zu umgehen.
WID-SEC-W-2024-1248Xerox FreeFlow Print Server: Mehrere SchwachstellenDeutsch2024-05-28csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in Xerox FreeFlow Print Server ausnutzen, um die Vertraulichkeit, Verfügbarkeit und Integrität des Systems zu gefährden

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cert_bund NVD CVE.org MITRE

published 2023-12-24modified 2026-06-17

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Related entries.

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+1444 more

references (52)

External citations — patches, advisories, analysis.

scry

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