text: UPDATE 01/16/2020: This blog post has been updated to reflect the availability of proof-of-concept code for CVE-2020-0601, which is being referred to as CurveBall or Chain of Fools.
  On January 14, Microsoft released its first Patch Tuesday of 2020, which contains an update for a critical vulnerability in the cryptographic library used in newer versions of Windows, including Windows 10 and Windows Server 2016/2019. CVE-2020-0601 was disclosed to Microsoft by the National Security Agency (NSA) via Microsoft’s Coordinated Vulnerability Disclosure process.
  Widespread speculation about a severe vulnerability in Microsoft Windows began to circulate on January 13 when Will Dormann, senior vulnerability analyst with the CERT Coordination Center (CERT/CC), hinted in a tweet that people should “pay very close attention” to the updates in Microsoft’s January 2020 Patch Tuesday.
  Shortly thereafter, investigative journalist Brian Krebs tweeted a warning about “an extraordinarily scary flaw in all Windows versions,” specifically mentioning the flaw was in a core cryptographic component.
  Krebs later released a blog post with additional details on the event. According to Krebs, the flaw exists in crypt32.dll, the Microsoft Cryptographic Application Programming Interface (CryptoAPI) used for certificate and cryptographic messaging functions. The post also indicates that branches of the U.S. military and other high-value customers received advance notice and patches from Microsoft under non-disclosure agreements (NDAs).