6.8
CVSSv2

CVE-2014-3556

Published: 29/12/2014 Updated: 10/11/2021
CVSS v2 Base Score: 6.8 | Impact Score: 6.4 | Exploitability Score: 8.6
VMScore: 605
Vector: AV:N/AC:M/Au:N/C:P/I:P/A:P

Vulnerability Summary

The STARTTLS implementation in mail/ngx_mail_smtp_handler.c in the SMTP proxy in nginx 1.5.x and 1.6.x prior to 1.6.1 and 1.7.x prior to 1.7.4 does not properly restrict I/O buffering, which allows man-in-the-middle malicious users 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.

Vulnerability Trend

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f5 nginx

Vendor Advisories

Debian Bug report logs - #757196 nginx: CVE-2014-3556 STARTTLS command injection Package: src:nginx; Maintainer for src:nginx is Debian Nginx Maintainers <pkg-nginx-maintainers@alioth-listsdebiannet>; Reported by: Christos Trochalakis <yatiohi@ideopolisgr> Date: Wed, 6 Aug 2014 07:03:07 UTC Severity: important Ta ...