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.
CVSS Details
- CVSS 3.1 Base Score: 7.4
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade nginx | Jul 30, 2024 | Dec 29, 2014 |
| Freebsd | — | Upgrade nginxUpgrade nginx-devel | Dec 10, 2025 | Aug 9, 2014 |
| Nginx | — | Upgrade to nginx version 1.6.1Upgrade to nginx version 1.7.4 | Dec 29, 2014 | Dec 29, 2014 |
| Suse | — | Upgrade nginx | Feb 4, 2022 | Dec 29, 2014 |
Prioritise with Active Threat Intelligence
With curated Threat Intelligence, you can see which vulnerabilities truly put you at risk, prioritize what matters most, and act before attackers do.
Explore Intelligence Hub