The widespread Microsoft Exchange mail server has again been targeted by cyber criminals. Last week, security researcher Orange Tsai presented a new attack method called ProxyShell on said software at the BlackHat security conference. This now prompts criminals to actively look for this loophole and exploit it, as the evaluations of various honeypots show. In computer security, a honeypot is, for example, a server that simulates the network services of a computer, an entire computer network. Honeypots are used to obtain information about attack patterns and attacker behavior. Due to the information obtained in this way, this situation is to be regarded as very critical, especially if the Microsoft Exchange Server can be reached via the Internet, which is currently the case with over 400,000 servers.