If you haven't patched your Microsoft Exchange Server recently you should seriously consider it. There are FOUR "zero-day" vulnerabilities currently wrecking havoc around the with tens of thousands of organizations affected.
The vulnerabilities are:
- CVE-2021-26855
- CVE-2021-26857
- CVE-2021-26858
- CVE-2021-27065
Microsoft issued emergency patches last week for the four vulnerabilities (which you can read more about here). Microsoft believes the hacking team behind the attacks, called Hafnium, is most likely based in China.
The United States Department of Homeland Security's Cybersecurity and Infrastructure Security Agency (CISA) has issued an order directing organizations apply the recently released patches.
Microsoft, in their statement regarding the issue, said "nation-state actors and criminal groups will move quickly to take advantage of any unpatched systems."
Hafnium perpetrates their attacks by deploying "web shells" on the afflicted Exchange servers. Their intent is to steal data and installing malware.
You can find out more about the vulnerabilities here on Microsoft's update guide page: https://msrc.microsoft.com/update-guide/vulnerability
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