Home/CVE/Exim before 4.97.1 allows SMTP smuggling in certain PIPELINING/CHUNKING configurations. Remote attackers can use a publi
CVE

CVE-2023-51766

Exim before 4.97.1 allows SMTP smuggling in certain PIPELINING/CHUNKING configurations. Remote attackers can use a publi

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.

MEDIUM · CVSS 5.3 EPSS 0.01642
Schedule remediation
  • Public exploit or PoC is available
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-345Insufficient Verification of Data Authenticity
▤

Affected Products & Versions

4
exim< 4.97.1
fedoraproject extra packages for enterprise linuxall versions
fedoraproject fedoraall versions
debian linuxall versions
⚠

Public Exploits & PoCs

1
pocwww.youtube.com · watch?v=V8KPV96g1Towww.youtube.com
◈

Detection Rules (IDS/IPS)

3
et-openET EXPLOIT Inbound Setup Message from SMTP Smuggling Tooltrojan-activity
et-openET EXPLOIT Inbound Smuggling Message from SMTP Smuggling Tool M1trojan-activity
et-openET EXPLOIT Inbound Smuggling Message from SMTP Smuggling Tool M2trojan-activity
Open rulesets (ET Open, Snort Community, abuse.ch) link to source. Commercial rulesets are reference-only.
▣

Scoring & Timeline

5.3
MEDIUM · CVSS v3.1 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD24 Dec 2023 · 06:15 AM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
⚑

Vendor Advisories

3
suse-csafopenSUSE-SU-2024:13543-1
usnUSN-6611-1
suse-csafopenSUSE-SU-2024:0007-1
🔗

References & Sources

21
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
http://www.openwall.com/lists/oss-security/2023/12/24/1Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2023/12/25/1Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2023/12/29/2Mailing ListMitigationThird Party Advisory
http://www.openwall.com/lists/oss-security/2024/01/01/1Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2024/01/01/2Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2024/01/01/3Mailing ListThird Party Advisory
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