CVE-2023-51766

CWE-3459 documents7 sources
Severity
5.3MEDIUM
EPSS
1.6%
top 18.05%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
4
Exim EximDebian Debian LinuxFedoraproject Extra Packages FOR Enterprise Linux+1 more
Timeline
PublishedDec 24
Latest updateJan 29

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 . but some other popular e-mail servers do not.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:NExploitability: 3.9 | Impact: 1.4

Affected Packages3 packages

▶NVDexim/exim< 4.97.1
▶Debianexim4< 4.94.2-7+deb11u2+3
▶NVDfedoraproject/extra_packages7.0, 8.0, 9.0+2

Also affects: Debian Linux 10.0, Fedora 38, 39

Patches

Patch: git.exim.org ↗Patch: git.exim.org ↗Patch: git.exim.org ↗

🔴Vulnerability Details

3
OSV
CVE-2023-51766: Exim before 4↗2023-12-24
▶
CVEList
CVE-2023-51766: Exim before 4↗2023-12-24
▶
GHSA
GHSA-w6ww-869j-cgm6: Exim through 4↗2023-12-24
▶

🔍Detection Rules

3
Suricata
ET EXPLOIT Inbound Setup Message from SMTP Smuggling Tool↗2024-01-05
▶
Suricata
ET EXPLOIT Inbound Smuggling Message from SMTP Smuggling Tool M2↗2024-01-05
▶
Suricata
ET EXPLOIT Inbound Smuggling Message from SMTP Smuggling Tool M1↗2024-01-05
▶

📋Vendor Advisories

2
Ubuntu
Exim vulnerability↗2024-01-29
▶
Debian
CVE-2023-51766: exim4 - Exim before 4.97.1 allows SMTP smuggling in certain PIPELINING/CHUNKING configur...↗2023
▶