CVE-2021-33768

What this means for your business

• It affects Microsoft Exchange Server. It matters if your company, or a supplier that handles your data, runs it.
• An attacker can use it from inside the same network, with an ordinary user login, and without anyone at your company clicking anything.
• FIRST's prediction model gives it a 1% chance of attack attempts being seen in the next 30 days, ranking above 67% of all known flaws.

What to do

1. 1Check whether your company or your suppliers run Microsoft Exchange Server, and which version. The affected versions are listed further down this page.
2. 2If you do, apply the vendor's fix. A patch or vendor advisory has been published.