CVE-2020-15955 – In s/qmail through 4.0.07, an active MitM can inject arbitrary plaintext

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 attacker.

Source: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-15955

Reference (s):

• https://nostarttls.secvuln.info/
• https://www.fehcom.de/sqmail/sqmail.html