Comprehensive Threat Exposure Management Platform
Critical Threat Research : Middle-East at WAR: The Rapidly Escalating Iranian Cyber Threat Download the Report Critical Threat Research : Middle-East at WAR: The Rapidly Escalating Iranian Cyber Threat Download the ReportMicrosoft’s December 2025 Patch Tuesday delivers a significant security update addressing 57 vulnerabilities across its product ecosystem, with 2 classified as critical, 54 as important, and 1 as low severity. The Microsoft December 2025 Patch Tuesday vulnerabilities span multiple security categories including 28 elevation of privilege flaws, 19 remote code execution (RCE) vulnerabilities, 4 information disclosure issues, 3 denial-of-service vulnerabilities, and 3 spoofing vulnerabilities affecting Microsoft Server, Windows Graphics, Windows Update Service, Microsoft Office, Microsoft SharePoint, GitHub Copilot, Chromium-based Microsoft Edge, and Azure platforms. Additionally, Microsoft has released patches for 13 non-Microsoft CVEs in this December 2025 Patch Tuesday update, bringing the total to 70 vulnerabilities addressed this month. Importantly, 10 of these Microsoft December 2025 vulnerabilities are at high risk of exploitation, emphasizing the critical need for immediate patch deployment across Windows Server 2022, 2025, Windows 11, and Windows 10 systems. This Microsoft December 2025 Patch Tuesday release centers on one actively exploited zero-day vulnerability demanding immediate attention: CVE-2025-62221, a Windows Cloud Files Mini Filter Driver elevation of privilege flaw already being exploited in the wild that targets Windows systems and can be executed through local, low-privilege access with low attack complexity and no user interaction. Successful exploitation of CVE-2025-62221 yields SYSTEM-level authority allowing full control of affected Windows systems. Two additional Microsoft December 2025 flaws have been publicly disclosed but are not known to be under active exploitation: CVE-2025-54100, a PowerShell remote code execution vulnerability, and CVE-2025-64671, which affects GitHub Copilot for JetBrains and introduces a command-injection vector permitting remote, unauthenticated execution of arbitrary code.
Microsoft’s December 2025 Patch Tuesday delivers a significant security update addressing 57 vulnerabilities across its product ecosystem with widespread impact. Of these Microsoft December 2025 vulnerabilities, 2 are classified as critical severity, 54 as important severity, and 1 as low severity. The Microsoft December 2025 Patch Tuesday vulnerabilities span multiple security categories: 28 elevation of privilege vulnerabilities affecting Windows system components, 19 remote code execution (RCE) vulnerabilities targeting Microsoft Office and server products, 4 information disclosure issues, 3 denial-of-service vulnerabilities, and 3 spoofing issues affecting Exchange and SharePoint. Additionally, Microsoft has released patches for 13 non-Microsoft CVEs in this December 2025 update, bringing the total to 70 vulnerabilities addressed this month. Importantly, 10 of these Microsoft December 2025 vulnerabilities are at high risk of exploitation, emphasizing the critical need for immediate patch deployment across enterprise Windows environments.
This Microsoft December 2025 Patch Tuesday release centers on one actively exploited zero-day vulnerability demanding immediate attention from Windows administrators. The most critical is zero-day tracked as CVE-2025-62221, a privilege-elevation flaw in Windows Cloud Files Mini Filter Driver that is already being exploited in the wild. CVE-2025-62221 targets Windows systems running the Cloud Files Mini Filter Driver and can be executed through local, low-privilege access with low attack complexity and no user interaction required. Successful exploitation of CVE-2025-62221 yields SYSTEM-level authority, allowing complete control of the affected Windows system. An attacker can gain an initial low-privilege foothold on Windows systems through phishing campaigns, browser-based exploitation, or any existing remote code execution vulnerability. Once inside, chaining that limited access with CVE-2025-62221 enables complete Windows host compromise. With SYSTEM privileges obtained through CVE-2025-62221 exploitation, the attacker can load kernel components, misuse signed drivers to bypass Windows security defenses, maintain persistent access, and pivot toward domain-wide compromise when paired with credential theft techniques.
Two additional Microsoft December 2025 flaws have been publicly disclosed but are not currently known to be under active exploitation in the wild. CVE-2025-54100 is a PowerShell remote code execution vulnerability that lets unauthenticated local attackers run arbitrary code by abusing a command-injection weakness in PowerShell parsing. The CVE-2025-54100 threat escalates significantly when folded into routine Windows administrative workflows. A common CVE-2025-54100 exploitation example is an attacker persuading a user or Windows administrator to execute a PowerShell command using Invoke-WebRequest, allowing a remote attacker-controlled server to deliver crafted content that triggers the parsing flaw, resulting in arbitrary code execution and malware implant deployment on Windows systems.
CVE-2025-64671 affects GitHub Copilot for JetBrains IDEs and introduces a serious command-injection vector in development environments. This CVE-2025-64671 flaw can permit remote, unauthenticated execution of arbitrary code on developer workstations running vulnerable versions of GitHub Copilot for JetBrains. Organizations need to test and deploy these Microsoft December 2025 Patch Tuesday updates through Windows Update or the Microsoft Update Catalog without delay, given the zero-day exposure of CVE-2025-62221 and the publicly disclosed nature of CVE-2025-54100 and CVE-2025-64671. Extended Security Updates remain essential for Windows 10 systems after the end of support to protect against these Microsoft December 2025 vulnerabilities.
Conduct an extensive service exposure evaluation to identify any vulnerable Microsoft services that may be publicly accessible via the internet. Take immediate and decisive action to address any identified Microsoft December 2025 vulnerabilities, either by installing essential patches through Windows Update or adopting compensating security measures until patches can be deployed.
Keep your systems up to date by implementing the most recent Microsoft December 2025 Patch Tuesday security updates. To avoid the introduction of new vulnerabilities during patch deployment, follow security best practices adapted to your unique devices and Windows configurations. Furthermore, to strengthen the resilience of devices and applications exposed to the internet, thoroughly review their security configurations after applying Microsoft December 2025 patches.
Third-Party Tool Isolation: Contain the security exposure introduced by vulnerable development tools such as GitHub Copilot for JetBrains (CVE-2025-64671) by isolating them within controlled development environments, limiting plugin and extension execution permissions, and validating all command-handling configurations to prevent command injection attack pathways.
Conduct Post-Patch Validation and Testing: After deploying Microsoft December 2025 Patch Tuesday patches, perform thorough testing to confirm that the vulnerabilities including CVE-2025-62221, CVE-2025-54100, and CVE-2025-64671 have been mitigated and that critical business functions remain operational without disruption caused by the patches.
Microsoft December 2025 Patch Tuesday vulnerabilities demonstrate tactics spanning Initial Access (TA0001) via User Execution (T1204), Drive-by Compromise (T1189), Remote Services (T1021), Phishing (T1566), and Exploit Public-Facing Application (T1190), Execution (TA0002) through Exploitation for Client Execution (T1203), Command and Scripting Interpreter including JavaScript (T1059, T1059.007), Service Execution (T1569.002), Windows Management Instrumentation (T1047), and System Binary Proxy Execution (T1218), Persistence (TA0003) including Server Software Component (T1505), System Services (T1569), and Create or Modify System Process via Windows Service (T1543, T1543.003), Privilege Escalation (TA0004) via Exploitation for Privilege Escalation (T1068), Defense Evasion (TA0005) through Obtain Capabilities including Vulnerabilities (T1588, T1588.006), Modify Registry (T1112), Disable or Modify Tools (T1562.001), and Impair Defenses (T1562), Discovery (TA0007) including Remote System Discovery (T1018), System Owner/User Discovery (T1033), Account Discovery (T1087), and Network Service Discovery (T1046), Lateral Movement (TA0008) via Exploitation of Remote Services (T1210), External Remote Services (T1133), and Impact (TA0040) through Network Denial of Service (T1498), Endpoint Denial of Service (T1499), and Data from Local System (T1005).
https://msrc.microsoft.com/update-guide/releaseNote/2025-Dec
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