MS.Windows.DNS.Server.DNS.Update.DoS

Description

This indicates an attack attempt to exploit a Denial of Service Vulnerability in Microsoft Windows DNS Server.
The vulnerability is due to use of an error when processing a malformed DNS request. A remote attacker could exploit this vulnerability by sending a crafted DNS request to the target server. Successful exploitation could lead to a denial of service condition.

Affected Products

Windows Server 2008 for 32-bit Systems Service Pack 2
Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation)
Windows Server 2008 for x64-based Systems Service Pack 2
Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation)
Windows Server 2012
Windows Server 2012 (Server Core installation)
Windows Server 2012 R2
Windows Server 2012 R2 (Server Core installation)
Windows Server 2016
Windows Server 2016 (Server Core installation)
Windows Server 2019
Windows Server 2019 (Server Core installation)
Windows Server, version 20H2 (Server Core Installation)

Impact

Denial of Service: Remote attackers can crash vulnerable systems.

Recommended Actions

Apply the most recent upgrade or patch from the vendor.
https://msrc.microsoft.com/update-guide/e fn-US/vulnerability/CVE-2021-33745

References