CVE-2023-51766

Upstream information

CVE-2023-51766 at MITRE

Description

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.

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SUSE information

Overall state of this security issue: Resolved

This issue is currently rated as having moderate severity.

CVSS v3 Scores

CVSS detail	National Vulnerability Database
Base Score	5.3
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Attack Vector	Network
Attack Complexity	Low
Privileges Required	None
User Interaction	None
Scope	Unchanged
Confidentiality Impact	None
Integrity Impact	Low
Availability Impact	None
CVSSv3 Version	3.1

SUSE Bugzilla entry: 1218387 [NEW]

SUSE Security Advisories:

• TID000021307, published Wed Dec 27 18:56:14 CET 2023
• openSUSE-SU-2024:0007-1, published Thu Jan 4 04:52:00 2024

List of released packages

Product(s)	Fixed package version(s)	References
SUSE Package Hub 15 SP5	exim >= 4.97.1-bp155.5.9.1 eximon >= 4.97.1-bp155.5.9.1 eximstats-html >= 4.97.1-bp155.5.9.1	Patchnames: openSUSE-2024-7
openSUSE Leap 15.5	exim >= 4.97.1-bp155.5.9.1 eximon >= 4.97.1-bp155.5.9.1 eximstats-html >= 4.97.1-bp155.5.9.1	Patchnames: openSUSE-2024-7
openSUSE Tumbleweed	exim >= 4.97.1-1.1 eximon >= 4.97.1-1.1 eximstats-html >= 4.97.1-1.1	Patchnames: openSUSE-Tumbleweed-2024-13543

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SUSE Timeline for this CVE

CVE page created: Sun Dec 24 09:00:05 2023
CVE page last modified: Mon Oct 6 19:47:55 2025