Unrated severityNVD Advisory· Published Dec 29, 2014· Updated Jun 17, 2026
CVE-2014-3556
CVE-2014-3556
Description
The STARTTLS implementation in mail/ngx_mail_smtp_handler.c in the SMTP proxy in nginx 1.5.x and 1.6.x before 1.6.1 and 1.7.x before 1.7.4 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, a similar issue to CVE-2011-0411.
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Affected products
2Patches
Vulnerability mechanics
References
4- mailman.nginx.org/pipermail/nginx-announce/2014/000144.htmlnvdPatchVendor Advisory
- nginx.org/download/patch.2014.starttls.txtnvdPatchVendor Advisory
- marc.infonvdIssue TrackingThird Party Advisory
- bugzilla.redhat.com/show_bug.cginvdIssue TrackingThird Party Advisory
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