The National Cyber Security Centre (NCSC) of Britain has discovered a severe flaw that would affect Microsoft's Windows system, including the latest Windows 10, reports Xinhua.
The NCSC found the vulnerability when it was reviewing antivirus solutions after concerns about a Russian antivirus software, which was allegedly involved in cyber-spying operations, according to a report published on Monday on a Romanian website that covers information technology industry and software.
The security flaw is described as a remote code execution bug that would allow an attack to take full control of an unpatched system.
An unpatched system is an old system with its security not updated and so vulnerable to viruses and other attacks.
The vulnerability could be exploited if malicious files are used on the target computer during the scanning of a computer system with real-time protection turned on.
Microsoft is now working with NCSC, a unit of the UK's spy agency GCHQ, to have this patched by updating its malware protection engine with the latest version that is capable of removing the bug, the report said.