Microsoft Windows Server version 20H2 vulnerabilities

CVE-2021-34486 High · 7.8 KEV High · 61 Public exploit CWE-416 Aug 12, 2021

Microsoft Windows Event Tracing Privilege Escalation Vulnerability

Windows Event Tracing Elevation of Privilege Vulnerability

CVE-2021-34484 High · 7.8 KEV High · 56 Aug 12, 2021

Microsoft Windows User Profile Service Privilege Escalation Vulnerability

Windows User Profile Service Elevation of Privilege Vulnerability

CVE-2021-33771 High · 7.8 KEV High · 55 Jul 14, 2021

Microsoft Windows Kernel Privilege Escalation Vulnerability

Windows Kernel Elevation of Privilege Vulnerability

CVE-2021-31979 High · 7.8 KEV High · 55 CWE-119 Jul 14, 2021

Microsoft Windows Kernel Privilege Escalation Vulnerability

Windows Kernel Elevation of Privilege Vulnerability

CVE-2021-34527 High · 8.8 KEV Urgent · 84 Public exploit Ransomware Jul 2, 2021

Microsoft Windows Print Spooler Remote Code Execution Vulnerability

A remote code execution vulnerability exists when the Windows Print Spooler service improperly performs privileged file operations. An attacker who successfully exploited this vulnerability could run arbitrary code with SYSTEM privileges. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. UPDATE July 7, 2021: The security update for Windows Server 2012, Windows Server 2016 and Windows 10, Version 1607 have been released. Please see the Security Updates table for the applicable update for your system. We recommend that you install these updates immediately. If you are unable to install these updates, see the FAQ and Workaround sections in this CVE for information on how to help protect your system from this vulnerability. In addition to installing the updates, in order to secure your system, you must confirm that the following registry settings are set to 0 (zero) or are not defined (Note: These registry keys do not exist by default, and therefore are already at the secure setting.), also that your Group Policy setting are correct (see FAQ): HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows NT\Printers\PointAndPrint NoWarningNoElevationOnInstall = 0 (DWORD) or not defined (default setting) UpdatePromptSettings = 0 (DWORD) or not defined (default setting) Having NoWarningNoElevationOnInstall set to 1 makes your system vulnerable by design. UPDATE July 6, 2021: Microsoft has completed the investigation and has released security updates to address this vulnerability. Please see the Security Updates table for the applicable update for your system. We recommend that you install these updates immediately. If you are unable to install these updates, see the FAQ and Workaround sections in this CVE for information on how to help protect your system from this vulnerability. See also KB5005010: Restricting installation of new printer drivers after applying the July 6, 2021 updates. Note that the security updates released on and after July 6, 2021 contain protections for CVE-2021-1675 and the additional remote code execution exploit in the Windows Print Spooler service known as “PrintNightmare”, documented in CVE-2021-34527.

CVE-2021-33739 High · 8.4 KEV High · 61 Public exploit Jun 8, 2021

Microsoft Desktop Window Manager (DWM) Core Library Privilege Escalation Vulnerability

Microsoft DWM Core Library Elevation of Privilege Vulnerability

CVE-2021-1675 High · 7.8 KEV Urgent · 84 Public exploit Ransomware Jun 8, 2021

Microsoft Windows Print Spooler Remote Code Execution Vulnerability

Windows Print Spooler Remote Code Execution Vulnerability

CVE-2021-31201 Medium · 5.2 KEV High · 51 Jun 8, 2021

Microsoft Enhanced Cryptographic Provider Privilege Escalation Vulnerability

Microsoft Enhanced Cryptographic Provider Elevation of Privilege Vulnerability

CVE-2021-31956 High · 7.8 KEV High · 62 Public exploit CWE-191 Jun 8, 2021

Microsoft Windows NTFS Privilege Escalation Vulnerability

Windows NTFS Elevation of Privilege Vulnerability

CVE-2021-31199 Medium · 5.2 KEV High · 51 Jun 8, 2021

Microsoft Enhanced Cryptographic Provider Privilege Escalation Vulnerability

Microsoft Enhanced Cryptographic Provider Elevation of Privilege Vulnerability

CVE-2021-31955 Medium · 5.5 KEV High · 59 Public exploit CWE-497 Jun 8, 2021

Microsoft Windows Kernel Information Disclosure Vulnerability

Windows Kernel Information Disclosure Vulnerability

CVE-2021-31166 Critical · 9.8 KEV Urgent · 81 Public exploit CWE-416 May 11, 2021

Microsoft HTTP Protocol Stack Remote Code Execution Vulnerability

HTTP Protocol Stack Remote Code Execution Vulnerability

CVE-2021-28310 High · 7.8 KEV High · 61 Public exploit CWE-787 Apr 13, 2021

Microsoft Win32k Privilege Escalation Vulnerability

Win32k Elevation of Privilege Vulnerability

CVE-2021-1732 High · 7.8 KEV Urgent · 94 Public exploit Ransomware CWE-787 Feb 25, 2021

Microsoft Win32k Privilege Escalation Vulnerability

Windows Win32k Elevation of Privilege Vulnerability

CVE-2020-17087 High · 7.8 KEV High · 61 Public exploit CWE-131 Nov 11, 2020

Microsoft Windows Kernel Privilege Escalation Vulnerability

Windows Kernel Local Elevation of Privilege Vulnerability

CVE-2020-1472 Medium · 5.5 KEV Urgent · 96 Public exploit Ransomware Aug 17, 2020

Microsoft Netlogon Privilege Escalation Vulnerability

An elevation of privilege vulnerability exists when an attacker establishes a vulnerable Netlogon secure channel connection to a domain controller, using the Netlogon Remote Protocol (MS-NRPC). An attacker who successfully exploited the vulnerability could run a specially crafted application on a device on the network. To exploit the vulnerability, an unauthenticated attacker would be required to use MS-NRPC to connect to a domain controller to obtain domain administrator access. Microsoft is addressing the vulnerability in a phased two-part rollout. These updates address the vulnerability by modifying how Netlogon handles the usage of Netlogon secure channels. For guidelines on how to manage the changes required for this vulnerability and more information on the phased rollout, see How to manage the changes in Netlogon secure channel connections associated with CVE-2020-1472 (updated September 28, 2020). When the second phase of Windows updates become available in Q1 2021, customers will be notified via a revision to this security vulnerability. If you wish to be notified when these updates are released, we recommend that you register for the security notifications mailer to be alerted of content changes to this advisory. See Microsoft Technical Security Notifications.