Vulnerability Details CVE-2023-51766
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.032
EPSS Ranking 86.4%
CVSS Severity
CVSS v3 Score 5.3
Products affected by CVE-2023-51766
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cpe:2.3:a:exim:exim:4.80.1
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cpe:2.3:a:exim:exim:4.82.1
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cpe:2.3:a:exim:exim:4.84.2
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cpe:2.3:a:exim:exim:4.85.1
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cpe:2.3:a:exim:exim:4.85.2
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cpe:2.3:a:exim:exim:4.86.1
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cpe:2.3:a:exim:exim:4.86.2
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cpe:2.3:a:exim:exim:4.87.1
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cpe:2.3:a:exim:exim:4.89.1
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cpe:2.3:a:exim:exim:4.90.0.22
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cpe:2.3:a:exim:exim:4.90.0.27
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cpe:2.3:a:exim:exim:4.90.1
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cpe:2.3:a:exim:exim:4.92.1
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cpe:2.3:a:exim:exim:4.92.2
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cpe:2.3:a:exim:exim:4.93.0.4
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cpe:2.3:a:exim:exim:4.93.0.4-3.1
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cpe:2.3:a:exim:exim:4.94.1
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cpe:2.3:a:exim:exim:4.94.2
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cpe:2.3:a:fedoraproject:extra_packages_for_enterprise_linux:7.0
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cpe:2.3:a:fedoraproject:extra_packages_for_enterprise_linux:8.0
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cpe:2.3:a:fedoraproject:extra_packages_for_enterprise_linux:9.0
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cpe:2.3:o:debian:debian_linux:10.0
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cpe:2.3:o:fedoraproject:fedora:38
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cpe:2.3:o:fedoraproject:fedora:39