We are proactively sharing out IP data on likely CVE-2023-21529 vulnerable MS Exchange instances. Over 87K instances have not applied the latest Exchange Feb 14th 2023 update:

Reported instances are also likely vulnerable to CVE-2023-21706, CVE-2023-21707, and CVE-2023-21710 - covered by the same Feb 14th update.

If you receive such a report for your network or constituency, make sure to patch!

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