CVE-2025-25004: Microsoft PowerShell Privilege Escalation

CVE-2025-25004 Overview

CVE-2025-25004 is an improper access control vulnerability in Microsoft PowerShell that allows an authorized attacker to elevate privileges locally. This vulnerability affects a wide range of Microsoft Windows operating systems and Windows Server versions, making it a significant concern for enterprise environments relying on PowerShell for system administration and automation tasks.

The vulnerability exists due to insufficient access control mechanisms within PowerShell, which can be exploited by a local attacker with valid credentials to escalate their privileges on the affected system. Successful exploitation could grant an attacker elevated access, potentially leading to complete system compromise.

Critical Impact

An authenticated local attacker can exploit improper access controls in Microsoft PowerShell to escalate privileges, potentially gaining administrative or SYSTEM-level access across affected Windows systems and servers.

Affected Products

• Microsoft PowerShell
• Microsoft Windows 10 (versions 1507, 1607, 1809, 21H2, 22H2)
• Microsoft Windows 11 (versions 22H2, 23H2, 24H2, 25H2)
• Microsoft Windows Server 2008, 2012, 2016, 2019, 2022, 2022 23H2, 2025

Discovery Timeline

• October 14, 2025 - CVE-2025-25004 published to NVD
• October 20, 2025 - Last updated in NVD database

Technical Details for CVE-2025-25004

Vulnerability Analysis

This vulnerability is classified under CWE-284 (Improper Access Control), indicating that the affected PowerShell component fails to properly restrict access to system resources or functionality. The improper access control flaw allows an attacker who already has a foothold on the system to bypass intended security restrictions and elevate their privileges.

The attack requires local access and user interaction, meaning an attacker must either have physical access to the machine or have already gained initial access through another vector such as phishing or malware. Once the attacker has local access with low privileges, they can exploit this vulnerability to gain higher-level permissions.

The potential impact of successful exploitation is severe, as it could result in complete compromise of confidentiality, integrity, and availability of the affected system. An attacker with elevated privileges could access sensitive data, install persistent malware, modify system configurations, or use the compromised system as a pivot point for lateral movement within the network.

Root Cause

The root cause of CVE-2025-25004 is improper access control within Microsoft PowerShell. The vulnerability stems from insufficient validation or enforcement of access permissions when PowerShell processes certain operations or commands. This allows a low-privileged user to perform actions that should be restricted to administrators or system accounts.

The flaw affects both standalone PowerShell installations and the PowerShell components integrated into Windows operating systems, which explains the extensive list of affected products spanning multiple Windows 10, Windows 11, and Windows Server versions.

Attack Vector

The attack vector for CVE-2025-25004 is local, requiring the attacker to have authenticated access to the target system. The exploitation process involves:

1. An attacker gains initial access to a Windows system with standard user privileges
2. The attacker leverages the improper access control vulnerability in PowerShell
3. Through specifically crafted operations or commands, the attacker bypasses privilege restrictions
4. The attacker escalates their privileges to a higher level (potentially Administrator or SYSTEM)

The vulnerability requires user interaction, which could involve tricking a user into executing a malicious script or opening a crafted file that triggers the vulnerability. Organizations should be particularly vigilant about social engineering attacks that could facilitate this exploitation path.

Detection Methods for CVE-2025-25004

Indicators of Compromise

• Unusual PowerShell execution patterns, particularly scripts running with elevated privileges from non-administrative user contexts
• Unexpected privilege escalation events in Windows Security logs (Event ID 4672, 4673, 4674)
• PowerShell script block logging showing suspicious commands attempting to access privileged resources
• Process creation events showing PowerShell spawning child processes with higher privileges than the parent

Detection Strategies

• Enable PowerShell Script Block Logging and Module Logging to capture detailed command execution
• Monitor Windows Security Event logs for privilege escalation indicators (Event IDs 4672, 4688)
• Implement behavioral detection rules for anomalous PowerShell activity using EDR solutions like SentinelOne
• Configure Windows Defender Application Control (WDAC) policies to restrict unauthorized script execution

Monitoring Recommendations

• Deploy SentinelOne Singularity Platform for real-time detection of privilege escalation attempts and suspicious PowerShell behavior
• Establish baseline PowerShell usage patterns and alert on deviations
• Monitor for lateral movement attempts following potential privilege escalation events
• Review PowerShell Operational logs (Microsoft-Windows-PowerShell/Operational) for unusual activity patterns

How to Mitigate CVE-2025-25004

Immediate Actions Required

• Apply the latest Microsoft security updates for all affected Windows systems and PowerShell installations
• Review user permissions and implement principle of least privilege across all systems
• Enable PowerShell Constrained Language Mode for non-administrative users where feasible
• Conduct a security assessment to identify potentially compromised systems

Patch Information

Microsoft has released security updates to address CVE-2025-25004. Organizations should consult the Microsoft Security Update Guide for CVE-2025-25004 for detailed patch information specific to their affected products and versions.

Patches are available through Windows Update, Windows Server Update Services (WSUS), and the Microsoft Update Catalog. Organizations should prioritize patching based on system criticality and exposure, with particular attention to domain controllers, administrative workstations, and other high-value targets.

Workarounds

• Restrict PowerShell execution to authorized administrators using Group Policy or Windows Defender Application Control
• Implement AppLocker or WDAC rules to control which scripts and modules can execute
• Enable PowerShell Constrained Language Mode on systems where full PowerShell functionality is not required
• Consider temporarily disabling PowerShell remoting on sensitive systems until patches are applied

# Enable PowerShell Constrained Language Mode via registry
# Run in an elevated PowerShell session
Set-ItemProperty -Path 'HKLM:\SYSTEM\CurrentControlSet\Control\Session Manager\Environment' -Name '__PSLockdownPolicy' -Value 4

# Verify PowerShell Script Block Logging is enabled
Set-ItemProperty -Path 'HKLM:\SOFTWARE\Policies\Microsoft\Windows\PowerShell\ScriptBlockLogging' -Name 'EnableScriptBlockLogging' -Value 1