https://techcrunch.com/2020/01/14/microsoft-critical-certificates-bug/

Microsoft has released a security patch for a dangerous vulnerability affecting hundreds of millions of computers running Windows 10.

The vulnerability is found in a decades-old Windows cryptographic component, known as CryptoAPI. The component has a range of functions, one of which allows developers digitally sign their software, proving that the software has not been tampered with. But the bug may allow attackers to spoof legitimate software, potentially making it easier to run malicious software — like ransomware — on a vulnerable computer.