Thousands of Microsoft Exchange servers still compromised after patches

Microsoft has previously warned that patching won’t evict a hacker who has already compromised a server. — Reuters

Thousands of Microsoft Exchange servers are still compromised by hackers even after applying fixes, a top US cybersecurity official said on March 22, citing data from cybersecurity companies.

Brandon Wales, acting director of the Cybersecurity and Infrastructure Security Agency, said owners of the email servers that were compromised before Microsoft Corp issued a patch nearly three weeks ago must take additional measures to remove the hackers from their networks.