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How the CVE Works:
CVE-2025-21247 exploits improper path equivalence resolution in Windows’ `MapUrlToZone` function, allowing attackers to bypass security zone restrictions via crafted network paths. By manipulating path normalization, an attacker can trick the system into treating a malicious remote resource as a local or trusted zone file, enabling arbitrary code execution or privilege escalation. The flaw stems from insufficient validation during URL-to-zone mapping, permitting unauthorized access to restricted functionalities.
DailyCVE Form:
Platform: Windows
Version: 10/11, Server 2016+
Vulnerability: Security Bypass
Severity: Critical
Date: 07/03/2025
Prediction: Patch by 08/2025
What Undercode Say:
Analytics:
Get-ChildItem -Path "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Zones" Test-NetConnection -ComputerName malicious.site -Port 443
How Exploit:
- Crafted UNC paths abuse `MapUrlToZone` misvalidation.
- Phishing emails with embedded malicious links.
Protection from this CVE:
- Disable unnecessary SMB/WebDAV protocols.
- Apply Microsoft’s pending patch.
Impact:
- Remote code execution.
- Privilege escalation.
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
