The remote web application firewall may be affected by a denial of service vulnerability
According to its banner, the version of ModSecurity installed on the remote host is earlier than 2.7.0. It is, therefore, potentially affected by a security bypass vulnerability. An error exists related to HTTP POST requests and 'Content-Disposition' headers containing extra lines that could allow a remote attacker to bypass certain filters and carry out attacks.
Upgrade to ModSecurity version 2.7.0 or later.