Windows Runtime Remote Code Execution Vulnerability (CVE-2022-21971) Security Advisory
Executive & SecOps Summary
SECOPS ASSESSMENTMicrosoft Windows operating systems utilizing Windows Runtime (WinRT), including Windows 10, Windows 11, and Windows Server 2016/2019/2022
Successful exploitation allows an attacker to execute arbitrary code with the privileges of the active user by tricking them into opening a specially crafted file
Apply the official Microsoft Cumulative Updates immediately and restrict execution of untrusted files
Affected Products & Version Scope
Remediation & Live Workaround Commands
PATCH & WORKAROUND1. Official Patch & Version Upgrade Commands
Deploy the latest Microsoft Cumulative Update (LCU) to resolve the vulnerability. You can force the update process using PowerShell.
# Install PSWindowsUpdate module and apply all pending security patches
Install-Module PSWindowsUpdate -Force -Verbose
Get-WindowsUpdate -AcceptAll -Install -AutoReboot2. Temporary Workaround & Hardening Configuration
If immediate patching is not feasible, enforce strict software restriction policies to prevent the execution of untrusted binaries downloaded from external sources.
# Enable and start the Application Identity service required for AppLocker
Write-Output 'Starting Application Identity Service for AppLocker enforcement...'
Set-Service -Name AppIDSvc -StartupType Automatic
Start-Service -Name AppIDSvc3. Log Audit & IoC Verification Commands
Verify the current Windows OS build and check if the February 2022 (or later) security updates are successfully installed.
# Retrieve OS version details and list recently installed hotfixes
Get-ComputerInfo | Select-Object OsName, OsVersion, OsBuildNumber
Get-HotFix | Where-Object { $_.Description -eq 'Security Update' } | Sort-Object InstalledOn -Descending | Select-Object -First 5Block Kernel Privilege Escalation & Ransomware Payloads Before You Can Reboot
Protect unpatched Windows, Linux, and macOS workloads against in-memory exploitation and lateral movement with autonomous EDR.
Technical Root Cause & Exploitation Mechanics
1. Vulnerability Overview & Root Cause
This vulnerability (CVE-2022-21971) is a remote code execution vulnerability in the Windows Runtime (WinRT) environment, stemming from an uninitialized pointer dereference (CWE-824). When the system attempts to access or invoke an object structure in memory that has not been properly initialized, it triggers memory corruption, allowing the execution flow to be redirected to an attacker-controlled memory address.
2. Exploitation Mechanics & Attack Scenario
An attacker typically leverages social engineering tactics, such as phishing, to deliver a specially crafted file or lure the victim to a malicious website designed to invoke vulnerable WinRT APIs. Upon opening the file or rendering the content, the uninitialized pointer is dereferenced within the Windows Runtime engine, leading to the execution of arbitrary shellcode within the context of the logged-in user. Although classified with a local attack vector (AV:L), the requirement for user interaction (UI:R) makes it highly viable for remote delivery via web or email.
3. Infrastructure & Business Impact
This vulnerability is actively exploited in the wild and is listed in the CISA KEV catalog. Successful exploitation grants the attacker the same privileges as the current user. If the victim has administrative privileges, the attacker can compromise the entire endpoint, establish persistence, move laterally across the corporate network, and deploy ransomware or exfiltrate sensitive data.
Official Vendor Advisories & References
Windows Runtime Remote Code Execution Vulnerability
Frequently Asked SecOps Questions (CVE-2022-21971)
FAQQ1. How critical is CVE-2022-21971 and is it actively exploited in the wild?
CVE-2022-21971 is rated CVSS 7.8 (HIGH) with a 30-day EPSS exploitation probability of 53.9%. It is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, requiring immediate emergency remediation.
Q2. Which vendors and products are affected by CVE-2022-21971?
Primary impacted vendors include microsoft across windows, windows_runtime. Scope summary: Microsoft Windows 10, Windows 11, and Windows Server 2016/2019/2022 prior to the February 2022 security updates
Q3. What temporary mitigations or workarounds exist for CVE-2022-21971 before patching?
[Mitigation] Apply the official Microsoft Cumulative Updates immediately and restrict execution of untrusted files Follow the CLI remediation commands and interactive SecOps checklist on this page to restrict exposure prior to your maintenance window.
Generate an Internal Engineering Notice or CISO Report for CVE-2022-21971
Instantly format this advisory into an executive CISO summary or engineering patch ticket.
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