CVE-2023-51764 — SMTP Smuggling: Insufficient Verification of Data Authenticity in Postfix
Severity
5.3MEDIUMNVD
EPSS
27.1%
top 3.62%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
Timeline
PublishedDec 24
Latest updateJan 31
Description
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 . but some other popular e-mail servers do not. To prevent attack variants (by a…
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 Packages2 packages
Also affects: Fedora 38, 39, Enterprise Linux 8.0, 9.0
🔴Vulnerability Details
3🔍Detection Rules
3📋Vendor Advisories
5Microsoft▶
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 rec↗2023-12-12
Debian▶
CVE-2023-51764: postfix - Postfix through 3.8.5 allows SMTP smuggling unless configured with smtpd_data_re...↗2023