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.
Remediation
References
Related Vulnerabilities
WordPress Plugin Simple Custom CSS and JS Cross-Site Scripting (3.3)
MySQL CVE-2021-2046 Vulnerability (CVE-2021-2046)
Oracle JRE CVE-2020-2816 Vulnerability (CVE-2020-2816)
WordPress Plugin Jock on air now Multiple Vulnerabilities (5.6.1)
WordPress Plugin Wordpress Uninstall Cross-Site Request Forgery (1.2.1)