CVE-2025-33053: Microsoft Windows External Control of File Name or Path Vulnerability

CVE-2025-33053 is an external control of file name or path vulnerability in Microsoft Windows. It allows an attacker to execute code from a remote WebDAV location by controlling the WorkingDirectory attribute in Internet Shortcut files. This matters because successful abuse can lead to arbitrary code execution on affected systems, giving attackers a foothold for further activity. Confirm all details, including affected configurations, against the vendor advisory.

Defenders should treat this as a high-priority item for Windows environments where Internet Shortcut files are processed, as the weakness enables remote code loading without needing local file placement in every case.

How it works

This vulnerability falls under CWE-73, external control of file name or path. In Microsoft Windows, Internet Shortcut files can specify a WorkingDirectory attribute. An attacker who can influence or supply such a file can set that attribute to point to a remote WebDAV location under their control. When the system processes the shortcut, it may retrieve and execute code from that remote path.

The abuse path relies on the operating system honoring the attacker-controlled path for execution context rather than restricting it to trusted local resources. No further exploit mechanics are detailed in public summaries; specifics of delivery or triggering must be confirmed against the vendor advisory. The result is potential remote code execution on the targeted Windows host.

Am I affected? How to find it in your systems

The vulnerability affects Microsoft Windows. It typically appears on endpoints, servers, and workstations that handle Internet Shortcut files, which are common in user profiles, downloads, email attachments, or shared folders. Inventory all Windows systems in your environment using asset management tools, endpoint agents, or scripts that enumerate OS versions and installed components.

Check for the presence of Internet Shortcut files (commonly .url extensions) and review any configurations that process them automatically. Because exact vulnerable versions and builds are not listed here, compare your systems against the vendor advisory for precise applicability. Look for signs of exploitation in logs such as unexpected WebDAV connections, process creations tied to shortcut handling, or network traffic to untrusted remote paths. Endpoint detection tools may surface anomalous file attribute usage or remote resource loads; enable detailed auditing of file and network events where possible.

How to remediate

Apply the vendor-supplied update for Microsoft Windows as the primary remediation. Follow the instructions in the official advisory exactly, including any prerequisites or reboot requirements. After patching, verify installation through your patch management system or by checking system update history.

For this class of weakness, harden systems by restricting the processing of untrusted Internet Shortcut files, limiting WebDAV client capabilities where feasible, and enforcing least-privilege execution for user contexts that handle external files. Review and tighten group policies or application control rules that govern shortcut behavior. Confirm all post-patch validation steps against the vendor advisory.

If you can't patch immediately

Implement compensating controls while preparing to patch. Segment networks to isolate Windows systems that process external files from high-value assets. Use application control or virtual patching via host-based firewalls and intrusion prevention to block unexpected WebDAV outbound connections. Disable or restrict the affected feature if operationally possible, such as limiting Internet Shortcut handling through policy. Increase monitoring for WebDAV traffic, shortcut file creation, and anomalous process launches. Follow applicable BOD 22-01 guidance for any cloud-hosted Windows instances, or discontinue use of the product if mitigations cannot be applied. These steps reduce but do not eliminate risk; prioritize the official update.

If your data may have been exposed

Actively exploited vulnerabilities of this type can lead to breaches involving code execution and subsequent data access. Known ransomware use is not documented for this CVE. If compromise is suspected, isolate affected systems, preserve forensic evidence, and follow your incident response plan. Readers can run a free exposure scan of their email addresses to check against known breach data sets for any related personal information exposure.