Man-in-the-Middle (MitM) attack in Postfix - CVE-2011-0411

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Main Vulnerability Database Vulnerabilities #VU32859

Man-in-the-Middle (MitM) attack in Postfix - CVE-2011-0411

Published: March 17, 2011 / Updated: June 8, 2025


Vulnerability identifier: #VU32859
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2011-0411
CWE-ID: CWE-300
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vendor: Postfix.org
Affected software:
Postfix

Detailed vulnerability description

The vulnerability allows a remote attacker to perform MitM attack.

The vulnerability exists due to incorrect implementation of STARTTLS command that does not properly restrict I/O buffering, which allows man-in-the-middle attackers to insert commands into encrypted SMTP sessions by sending a cleartext command that is processed after TLS is in place, related to a "plaintext command injection" attack.


How to mitigate CVE-2011-0411

Install update from vendor's website.

Sources