China's cyberspace regulator said on Sunday that U.S. chipmaker Micron Technology's products did not pass its network security review for posing "serious network security risks" as it banned operators of key infrastructure from buying them.

China announced its review of Micron's products in late March to ensure supply chain security for key information infrastructure and to ward off cybersecurity risks.

The Cyberspace Administration of China (CAC) reviewed Micron products sold on the Chinese mainland. Though the decision would bar operators of key infrastructure from buying from the company, the ban is an individual case, and China will continue to open up its market to global businesses, the CAC said.

'A necessary measure'

"The review found that Micron's products have serious network security risks, which pose significant security risks to China's critical information infrastructure supply chain, affecting China's national security," the CAC said in a statement.

The review of Micron was aimed at preventing the products' cybersecurity problems from endangering the security of national information infrastructure, it said.  

As a result, the authorities demanded that China's domestic critical information infrastructure operators stop purchasing Micron products in accordance with the country's Cybersecurity Law and other regulations, according to the CAC. 

"Companies and platforms are welcome to introduce products and services into the Chinese market as long as they conform to the requirements of Chinese laws and regulations," the statement said.

It is a "necessary measure" to safeguard national security, the statement said, stressing that China firmly promotes high-level opening up.