CVEvulnerability
CVE-2023-51766
5.3 MEDIUM
Official page ↗
- Status
- Modified
- Published
- 2023-12-24
- Last modified
- 2026-06-17
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 5.3 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- Weaknesses
- CWE-345
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.
Affected configurations
• exim exim (< 4.97.1)
• fedoraproject extra packages for enterprise linux 7.0
• fedoraproject extra packages for enterprise linux 8.0
• fedoraproject extra packages for enterprise linux 9.0
• fedoraproject fedora 38
• fedoraproject fedora 39
• debian debian linux 10.0
Related
Weakness · CWE (1)
- CWE-345 Insufficient Verification of Data Authenticity weakness
References
- http://www.openwall.com/lists/oss-security/2023/12/24/1 Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2023/12/25/1 Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2023/12/29/2 Mailing List, Mitigation, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2024/01/01/1 Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2024/01/01/2 Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2024/01/01/3 Mailing List, Third Party Advisory
- https://bugs.exim.org/show_bug.cgi?id=3063 Issue Tracking, Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2255852 Issue Tracking, Third Party Advisory
- https://exim.org/static/doc/security/CVE-2023-51766.txt Broken Link
- https://fahrplan.events.ccc.de/congress/2023/fahrplan/events/11782.html Technical Description
- https://git.exim.org/exim.git/commit/5bb786d5ad568a88d50d15452aacc8404047e5ca Patch
- https://git.exim.org/exim.git/commit/cf1376206284f2a4f11e32d931d4aade34c206c5 Patch
- https://github.com/Exim/exim/blob/master/doc/doc-txt/cve-2023-51766 Mitigation, Vendor Advisory
- https://lists.debian.org/debian-lts-announce/2024/01/msg00002.html Mailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ORN7OKEQPPBKUHYRQ6LR5PSNBQVDHAWB/ Mailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QPDWHJPABVJCXDSNELSSVTIVAJU2MDUQ/ Mailing List, Third Party Advisory
- https://lwn.net/Articles/956533/ Third Party Advisory
- https://sec-consult.com/blog/detail/smtp-smuggling-spoofing-e-mails-worldwide/ Technical Description, Third Party Advisory
- https://www.openwall.com/lists/oss-security/2023/12/23/2 Issue Tracking, Mailing List, Third Party Advisory
- https://www.youtube.com/watch?v=V8KPV96g1To Exploit
- http://www.openwall.com/lists/oss-security/2023/12/24/1 Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2023/12/25/1 Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2023/12/29/2 Mailing List, Mitigation, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2024/01/01/1 Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2024/01/01/2 Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2024/01/01/3 Mailing List, Third Party Advisory
- https://bugs.exim.org/show_bug.cgi?id=3063 Issue Tracking, Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2255852 Issue Tracking, Third Party Advisory
- https://exim.org/static/doc/security/CVE-2023-51766.txt Broken Link
- https://fahrplan.events.ccc.de/congress/2023/fahrplan/events/11782.html Technical Description
- https://git.exim.org/exim.git/commit/5bb786d5ad568a88d50d15452aacc8404047e5ca Patch
- https://git.exim.org/exim.git/commit/cf1376206284f2a4f11e32d931d4aade34c206c5 Patch
- https://github.com/Exim/exim/blob/master/doc/doc-txt/cve-2023-51766 Mitigation, Vendor Advisory
- https://lists.debian.org/debian-lts-announce/2024/01/msg00002.html Mailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ORN7OKEQPPBKUHYRQ6LR5PSNBQVDHAWB/ Mailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QPDWHJPABVJCXDSNELSSVTIVAJU2MDUQ/ Mailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/[email protected]/message/ORN7OKEQPPBKUHYRQ6LR5PSNBQVDHAWB/ lists.fedoraproject.org
- https://lists.fedoraproject.org/archives/list/[email protected]/message/QPDWHJPABVJCXDSNELSSVTIVAJU2MDUQ/ lists.fedoraproject.org
- https://lwn.net/Articles/956533/ Third Party Advisory
- https://sec-consult.com/blog/detail/smtp-smuggling-spoofing-e-mails-worldwide/ Technical Description, Third Party Advisory
- https://www.openwall.com/lists/oss-security/2023/12/23/2 Issue Tracking, Mailing List, Third Party Advisory
- https://www.youtube.com/watch?v=V8KPV96g1To Exploit