Microsoft issued emergency security patches for multiple versions of Exchange Server on March 2, 2021. The updates addressed a series of zero-day exploits that compromised hundreds of thousands of on-premises Exchange Servers worldwide. Known collectively as ProxyLogon, the advanced persistent threats (APTs) allow an attacker to open a “backdoor” in Exchange Server that can be accessed from the Internet.
Cybersecurity may seem like a cat-and-mouse game, but the odds heavily favor the mouse. The cat must defend against all types of attack and quickly identify any potential security weaknesses. The mouse only has to find one vulnerability in order to elude the cat.