Microsoft: ADFS Security Feature Bypass Vulnerability
A security feature bypass vulnerability exists in Active Directory Federation Services (ADFS) which could allow an attacker to bypass the extranet lockout policy. To exploit this vulnerability, an attacker could run a specially crafted application, which would allow an attacker to launch a password brute-force attack or cause account lockouts in Active Directory. This security update corrects how ADFS handles external authentication requests.
Windows Server 2016,Windows Server, version 1903 (Server Core installation),Windows Server, version 1803 (Server Core Installation),Windows Server 2012,Windows Server 2019