CVSS 3.1 Score 5.3 of 10 (medium)


Published Dec 24, 2023
Updated: Jan 30, 2024
CWE ID 345


CVE-2023-51764 is a cyber vulnerability that affects Postfix, specifically versions up to 3.8.5. This vulnerability allows for SMTP smuggling if the configuration does not include "smtpd_data_restrictions=reject_unauth_pipelining" and "smtpd_discard_ehlo_keywords=chunking". Remote attackers can exploit this vulnerability to inject email messages with a spoofed MAIL FROM address, bypassing SPF protection. The danger lies in the potential for unauthorized access and manipulation of email communication. To remediate this vulnerability, it is recommended to enable the "smtpd_forbid_bare_newline=yes" option with a minimum Postfix version of 3.5.23, 3.6.13, 3.7.9, 3.8.4, or 3.9.

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