Security News > 2021 > April > NSA discovers critical Exchange Server vulnerabilities, patch now

Microsoft today has released security updates for Exchange Server that address a set of four vulnerabilities with severity scores ranging from high to critical.

The flaws affect on-premise Exchange Server versions 2013 through 2019 and while there is no evidence of being exploited in the wild, Microsoft assesses that threat actors are likely to leverage them as soon as they create an exploit.

The NSA says that the discovery of critical vulnerabilities in the Microsoft Exchange server is recent and that they reported them immediately through the "Disclosure process to secure the nation and our allies."

"After we disclosed these vulnerabilities to Microsoft, they promptly created a patch. NSA values partnership in the cybersecurity community. No one organization can secure their networks alone" - the U.S. National Security Agency.

Microsoft recommends organizations use the Exchange Server Health Checker script to detect common configuration issues that could cause performance trouble.

Getting the latest CU is as simple as accessing the update wizard here and selecting the Exchange version, the currently installed CU, and the required CU. Microsoft also provides a set of frequently asked questions for situations where errors occur during or after the installation of Exchange Server updates, available here.

News URL

https://www.bleepingcomputer.com/news/security/nsa-discovers-critical-exchange-server-vulnerabilities-patch-now/