Microsoft Windows AppX Installer contains a spoofing vulnerability which has a high impacts to confidentiality, integrity, and availability.

Microsoft Windows Common Log File System Driver contains a privilege escalation vulnerability that could allow a local, privileged attacker to bypass certain security mechanisms.

Microsoft Windows Installer contains an unspecified vulnerability that allows for privilege escalation.

Microsoft Win32k contains an unspecified vulnerability that allows for privilege escalation.

Microsoft Win32k contains an unspecified vulnerability that allows for privilege escalation.

Unspecified vulnerability allows for an authenticated user to escalate privileges.

Microsoft Windows Common Log File System (CLFS) driver contains an unspecified vulnerability that allows for privilege escalation.

Microsoft is investigating reports of a remote code execution vulnerability in MSHTML that affects Microsoft Windows. Microsoft is aware of targeted attacks that attempt to exploit this vulnerability by using specially-crafted Microsoft Office documents. An attacker could craft a malicious ActiveX control to be used by a Microsoft Office document that hosts the browser rendering engine. The attacker would then have to convince the user to open the malicious document. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights. Microsoft Defender Antivirus and Microsoft Defender for Endpoint both provide detection and protections for the known vulnerability. Customers should keep antimalware products up to date. Customers who utilize automatic updates do not need to take additional action. Enterprise customers who manage updates should select the detection build 1.349.22.0 or newer and deploy it across their environments. Microsoft Defender for Endpoint alerts will be displayed as: “Suspicious Cpl File Execution”. Upon completion of this investigation, Microsoft will take the appropriate action to help protect our customers. This may include providing a security update through our monthly release process or providing an out-of-cycle security update, depending on customer needs. Please see the Mitigations and Workaround sections for important information about steps you can take to protect your system from this vulnerability. UPDATE September 14, 2021: Microsoft 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. Please see the FAQ for important information about which updates are applicable to your system.

Microsoft Windows Event Tracing contains an unspecified vulnerability which can allow for privilege escalation.

Microsoft Windows User Profile Service contains an unspecified vulnerability that allows for privilege escalation.

Microsoft Windows Update Medic Service contains an unspecified vulnerability that allows for privilege escalation.

An elevation of privilege vulnerability exists because of overly permissive Access Control Lists (ACLs) on multiple system files, including the Security Accounts Manager (SAM) database. 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. An attacker must have the ability to execute code on a victim system to exploit this vulnerability. After installing this security update, you must manually delete all shadow copies of system files, including the SAM database, to fully mitigate this vulnerabilty. Simply installing this security update will not fully mitigate this vulnerability. See KB5005357- Delete Volume Shadow Copies.

Microsoft Windows Scripting Engine contains an unspecified vulnerability that allows for memory corruption.

Microsoft Windows kernel contains an unspecified vulnerability that allows for privilege escalation.

Microsoft Windows kernel contains an unspecified vulnerability that allows for privilege escalation.

Microsoft Windows MSHTML Platform contains an unspecified vulnerability that allows for remote code execution.

Microsoft Desktop Window Manager (DWM) Core Library contains an unspecified vulnerability that allows for privilege escalation.

Microsoft Windows Kernel contains an unspecified vulnerability that allows for information disclosure. Successful exploitation allows attackers to read the contents of kernel memory from a user-mode process.

Microsoft Windows New Technology File System (NTFS) contains an unspecified vulnerability that allows attackers to escalate privileges via a specially crafted application.

Microsoft Enhanced Cryptographic Provider contains an unspecified vulnerability that allows for privilege escalation.

Microsoft Enhanced Cryptographic Provider contains an unspecified vulnerability that allows for privilege escalation.

Microsoft Windows Print Spooler contains an unspecified vulnerability that allows for remote code execution.

HTTP Protocol Stack Remote Code Execution Vulnerability

Microsoft Windows Win32k contains an unspecified vulnerability that allows for privilege escalation.

Internet Explorer Remote Code Execution Vulnerability

Internet Explorer Memory Corruption Vulnerability

Microsoft Win32k contains an unspecified vulnerability that allows for privilege escalation.

Microsoft Defender contains an unspecified vulnerability that allows for remote code execution.

Microsoft Windows kernel contains an unspecified vulnerability that allows for privilege escalation.

<p>A remote code execution vulnerability exists in the way that Microsoft browsers access objects in memory. The vulnerability could corrupt memory in a way that could allow an attacker to execute arbitrary code in the context of the current user. An attacker who successfully exploited the vulnerability could gain the same user rights as the current user. If the current user is logged on with administrative user rights, the attacker could take control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.</p> <p>An attacker could host a specially crafted website that is designed to exploit the vulnerability through Microsoft browsers, and then convince a user to view the website. The attacker could also take advantage of compromised websites, or websites that accept or host user-provided content or advertisements, by adding specially crafted content that could exploit the vulnerability. In all cases, however, an attacker would have no way to force users to view the attacker-controlled content. Instead, an attacker would have to convince users to take action, typically via an enticement in email or instant message, or by getting them to open an email attachment.</p> <p>The security update addresses the vulnerability by modifying how Microsoft browsers handle objects in memory.</p>