Qmail Security Vulnerabilities

CVE-2020-15955

In s/qmail through 4.0.07, an active MitM can inject arbitrary plaintext commands into a STARTTLS encrypted session between an SMTP client and s/qmail. This allows e-mail messages and user credentials to be sent to the MitM...

CVE-1999-0250

Denial of service in Qmail through long SMTP...

CVE-1999-0144

Denial of service in Qmail by specifying a large number of recipients with the RCPT...