(Reuters) – The White House is closely following an emergency patch released by Microsoft Corp, said US security adviser Jake Sullivan on Thursday, after an unknown hacking group recently broke into organizations that used a flaw in the company's email server software.
"We closely monitor Microsoft's emergency fixes for previously unknown vulnerabilities in Exchange Server software and reports of potential compromises from US think tanks and industrial defense entities," said Jake Sullivan, President Joe Biden's National Security Adviser, on Twitter.  "We encourage network owners to patch ASAP," he said. His tweet contained a link to a security release from Microsoft.
Microsoft's almost ubiquitous product packages have been scrutinized since the hack by SolarWinds Corp., a Texas-based software company that served as a springboard for several government and private sector intrusions.
In other cases, hackers used the way customers had set up their Microsoft services to compromise their goals or dive further into affected networks.
Hackers who went after SolarWinds also violated Microsoft itself, accessing and downloading source code ̵