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Postfix through 3.8.5 allows SMTP smuggling unless configured with smtpd_data_restrictions=reject_unauth_pipelining and smtpd_discard_ehlo_keywords=chunking (or certain other options that exist in recent versions). 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 Postfix supports <LF>.<CR><LF> but some other popular e-mail servers do not. To prevent attack variants (by always disallowing <LF> without <CR>) a different solution is required such as the smtpd_forbid_bare_newline=yes option with a Postfix minimum version of 3.5.23 3.6.13 3.7.9 3.8.4 or 3.9.
| Reporter | Title | Published | Views | Family All 86 |
|---|---|---|---|---|
 | Exploit for Insufficient Verification of Data Authenticity in Postfix | 26 Dec 202317:02 | – | githubexploit |
| Exploit for Insufficient Verification of Data Authenticity in Postfix | 28 Dec 202306:20 | – | githubexploit |
| Exploit for Insufficient Verification of Data Authenticity in Postfix | 5 Jan 202407:07 | – | githubexploit |
 | Amazon Linux 2023 : postfix, postfix-cdb, postfix-ldap (ALAS2023-2024-495) | 23 Jan 202400:00 | – | nessus |
| Amazon Linux 2 : postfix (ALAS-2024-2420) | 23 Jan 202400:00 | – | nessus |
| Amazon Linux AMI : postfix (ALAS-2024-1914) | 6 Feb 202400:00 | – | nessus |
| Debian dla-3725 : postfix - security update | 30 Jan 202400:00 | – | nessus |
| Fedora 38 : postfix (2024-5c186175f2) | 10 Jan 202400:00 | – | nessus |
| Fedora 39 : postfix (2024-c839e7294f) | 10 Jan 202400:00 | – | nessus |
| CBL Mariner 2.0 Security Update: postfix (CVE-2023-51764) | 22 Jan 202400:00 | – | nessus |
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18 Feb 2026 10:00Current
5.4Medium risk
Vulners AI Score5.4
CVSS 3.15.3
EPSS0.2846