Home > Vulnerability Database > CVE-2023-51766

Mend.io Vulnerability Database

CVE-2023-51766

Date: December 24, 2023

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.

Language: C

Severity Score

5.3

Related Resources (23)

Url: https://github.com/Exim/exim/blob/master/doc/doc-txt/cve-2023-51766

Url: https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QPDWHJPABVJCXDSNELSSVTIVAJU2MDUQ/

Url: https://lists.debian.org/debian-lts-announce/2024/01/msg00002.html

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

Url: https://www.openwall.com/lists/oss-security/2023/12/23/2

Url: https://git.exim.org/exim.git/commit/5bb786d5ad568a88d50d15452aacc8404047e5ca

Url: https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ORN7OKEQPPBKUHYRQ6LR5PSNBQVDHAWB/

Url: https://fahrplan.events.ccc.de/congress/2023/fahrplan/events/11782.html

Url: http://www.openwall.com/lists/oss-security/2024/01/01/3

Url: https://bugzilla.redhat.com/show_bug.cgi?id=2255852

Url: http://www.openwall.com/lists/oss-security/2023/12/29/2

Url: https://lwn.net/Articles/956533/

Url: http://www.openwall.com/lists/oss-security/2024/01/01/2

Url: http://www.openwall.com/lists/oss-security/2024/01/01/1

Url: https://sec-consult.com/blog/detail/smtp-smuggling-spoofing-e-mails-worldwide/

Url: https://exim.org/static/doc/security/CVE-2023-51766.txt

Url: https://bugs.exim.org/show_bug.cgi?id=3063

Url: https://nvd.nist.gov/vuln/detail/CVE-2023-51766

Url: http://www.openwall.com/lists/oss-security/2023/12/25/1

Url: http://www.openwall.com/lists/oss-security/2023/12/24/1

Url: https://security-tracker.debian.org/tracker/CVE-2023-51766

Url: https://git.exim.org/exim.git/commit/cf1376206284f2a4f11e32d931d4aade34c206c5

Url: https://www.mend.io/vulnerability-database/CVE-2023-51766

Severity Score

5.3

Weakness Type (CWE)

Insufficient Verification of Data Authenticity

CWE-345

CVSS v3.1

Base Score:	5.3
Attack Vector (AV):	NETWORK
Attack Complexity (AC):	LOW
Privileges Required (PR):	NONE
User Interaction (UI):	NONE
Scope (S):	UNCHANGED
Confidentiality (C):	NONE
Integrity (I):	LOW
Availability (A):	NONE

Mend.io Vulnerability Database

We found results for “”

CVE-2023-51766

Date: December 24, 2023

Language: C

Severity Score

Related Resources (23)

Severity Score

Weakness Type (CWE)

CVSS v3.1

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