CVE-2023-51766

Published: Dic 24, 2023 Last Modified: Nov 04, 2025
ExploitDB:
Other exploit source:
Google Dorks:
MEDIUM 5,3
Source: [email protected]
Attack Vector: network
Attack Complexity: low
Privileges Required: none
User Interaction: none
Scope: unchanged
Confidentiality: none
Integrity: low
Availability: none

Description

AI Translation Available

Exim before 4.97.1 allows SMTP smuggling in certain PIPELINING/CHUNKING 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 Exim supports <LF>.<CR><LF> but some other popular e-mail servers do not.

EPSS (Exploit Prediction Scoring System)

Trend Analysis

EPSS (Exploit Prediction Scoring System)

Prevede la probabilità di sfruttamento basata su intelligence sulle minacce e sulle caratteristiche della vulnerabilità.

EPSS Score
0,0164
Percentile
0,8th
Updated

EPSS Score Trend (Last 90 Days)

345

Insufficient Verification of Data Authenticity

Draft
Abstraction: Class Structure: Simple
Common Consequences
Security Scopes Affected:
Integrity Other
Potential Impacts:
Varies By Context Unexpected State
Applicable Platforms
Technologies: ICS/OT
View CWE Details
Operating System

Debian Linux by Debian

Product Information
Vendor Debian
Product Debian Linux
Version 10.0
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Extra Packages For Enterprise Linux by Fedoraproject

Product Information
Vendor Fedoraproject
Product Extra Packages For Enterprise Linux
Version 9.0
cpe:2.3:a:fedoraproject:extra_packages_for_enterprise_linux:9.0:*:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Extra Packages For Enterprise Linux by Fedoraproject

Product Information
Vendor Fedoraproject
Product Extra Packages For Enterprise Linux
Version 7.0
cpe:2.3:a:fedoraproject:extra_packages_for_enterprise_linux:7.0:*:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Exim by Exim

Product Information
Vendor Exim
Product Exim
Version Range Affected
To 4.97.1 (exclusive)
cpe:2.3:a:exim:exim:*:*:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Operating System

Fedora by Fedoraproject

Product Information
Vendor Fedoraproject
Product Fedora
Version 39
cpe:2.3:o:fedoraproject:fedora:39:*:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Extra Packages For Enterprise Linux by Fedoraproject

Product Information
Vendor Fedoraproject
Product Extra Packages For Enterprise Linux
Version 8.0
cpe:2.3:a:fedoraproject:extra_packages_for_enterprise_linux:8.0:*:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Operating System

Fedora by Fedoraproject

Product Information
Vendor Fedoraproject
Product Fedora
Version 38
cpe:2.3:o:fedoraproject:fedora:38:*:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
https://bugs.exim.org/show_bug.cgi?id=3063
https://bugs.exim.org/show_bug.cgi?id=3063
https://bugzilla.redhat.com/show_bug.cgi?id=2255852
https://bugzilla.redhat.com/show_bug.cgi?id=2255852
https://exim.org/static/doc/security/CVE-2023-51766.txt
https://exim.org/static/doc/security/CVE-2023-51766.txt
https://fahrplan.events.ccc.de/congress/2023/fahrplan/event…
https://fahrplan.events.ccc.de/congress/2023/fahrplan/events/11782.html
https://git.exim.org/exim.git/commit/5bb786d5ad568a88d50d15…
https://git.exim.org/exim.git/commit/5bb786d5ad568a88d50d15452aacc8404047e5ca
https://git.exim.org/exim.git/commit/cf1376206284f2a4f11e32…
https://git.exim.org/exim.git/commit/cf1376206284f2a4f11e32d931d4aade34c206c5
https://github.com/Exim/exim/blob/master/doc/doc-txt/cve-20…
https://github.com/Exim/exim/blob/master/doc/doc-txt/cve-2023-51766
https://lists.debian.org/debian-lts-announce/2024/01/msg000…
https://lists.debian.org/debian-lts-announce/2024/01/msg00002.html
https://lists.fedoraproject.org/archives/list/package-annou…
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapr…
https://lists.fedoraproject.org/archives/list/package-annou…
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapr…
https://lists.fedoraproject.org/archives/list/package-annou…
https://lists.fedoraproject.org/archives/list/[email protected]…
https://lists.fedoraproject.org/archives/list/package-annou…
https://lists.fedoraproject.org/archives/list/[email protected]…
https://lwn.net/Articles/956533/
https://lwn.net/Articles/956533/
https://sec-consult.com/blog/detail/smtp-smuggling-spoofing…
https://sec-consult.com/blog/detail/smtp-smuggling-spoofing-e-mails-worldwide/
https://www.openwall.com/lists/oss-security/2023/12/23/2
https://www.openwall.com/lists/oss-security/2023/12/23/2
https://www.youtube.com/watch?v=V8KPV96g1To
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/2023/12/24/1
http://www.openwall.com/lists/oss-security/2023/12/25/1
http://www.openwall.com/lists/oss-security/2023/12/25/1
http://www.openwall.com/lists/oss-security/2023/12/29/2
http://www.openwall.com/lists/oss-security/2023/12/29/2
http://www.openwall.com/lists/oss-security/2024/01/01/1
http://www.openwall.com/lists/oss-security/2024/01/01/1
http://www.openwall.com/lists/oss-security/2024/01/01/2
http://www.openwall.com/lists/oss-security/2024/01/01/2
http://www.openwall.com/lists/oss-security/2024/01/01/3
http://www.openwall.com/lists/oss-security/2024/01/01/3
https://bugs.exim.org/show_bug.cgi?id=3063
https://bugs.exim.org/show_bug.cgi?id=3063
https://bugzilla.redhat.com/show_bug.cgi?id=2255852
https://bugzilla.redhat.com/show_bug.cgi?id=2255852
https://exim.org/static/doc/security/CVE-2023-51766.txt
https://exim.org/static/doc/security/CVE-2023-51766.txt
https://fahrplan.events.ccc.de/congress/2023/fahrplan/event…
https://fahrplan.events.ccc.de/congress/2023/fahrplan/events/11782.html
https://git.exim.org/exim.git/commit/5bb786d5ad568a88d50d15…
https://git.exim.org/exim.git/commit/5bb786d5ad568a88d50d15452aacc8404047e5ca
https://git.exim.org/exim.git/commit/cf1376206284f2a4f11e32…
https://git.exim.org/exim.git/commit/cf1376206284f2a4f11e32d931d4aade34c206c5
https://github.com/Exim/exim/blob/master/doc/doc-txt/cve-20…
https://github.com/Exim/exim/blob/master/doc/doc-txt/cve-2023-51766
https://lists.debian.org/debian-lts-announce/2024/01/msg000…
https://lists.debian.org/debian-lts-announce/2024/01/msg00002.html
https://lists.fedoraproject.org/archives/list/package-annou…
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapr…
https://lists.fedoraproject.org/archives/list/package-annou…
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapr…
https://lwn.net/Articles/956533/
https://lwn.net/Articles/956533/
https://sec-consult.com/blog/detail/smtp-smuggling-spoofing…
https://sec-consult.com/blog/detail/smtp-smuggling-spoofing-e-mails-worldwide/
https://www.openwall.com/lists/oss-security/2023/12/23/2
https://www.openwall.com/lists/oss-security/2023/12/23/2
https://www.youtube.com/watch?v=V8KPV96g1To
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/2023/12/24/1
http://www.openwall.com/lists/oss-security/2023/12/25/1
http://www.openwall.com/lists/oss-security/2023/12/25/1
http://www.openwall.com/lists/oss-security/2023/12/29/2
http://www.openwall.com/lists/oss-security/2023/12/29/2
http://www.openwall.com/lists/oss-security/2024/01/01/1
http://www.openwall.com/lists/oss-security/2024/01/01/1
http://www.openwall.com/lists/oss-security/2024/01/01/2
http://www.openwall.com/lists/oss-security/2024/01/01/2
http://www.openwall.com/lists/oss-security/2024/01/01/3
http://www.openwall.com/lists/oss-security/2024/01/01/3