CVE-2025-33053

CVE-2025-33053 is an external control of file name or path flaw (CWE-73) in how Windows processes Internet Shortcut (.url) files, allowing an unauthorized attacker to execute code over a network by making the shortcut resolve to an attacker-controlled path, such as a WebDAV share. Exploitation requires user interaction (CVSS vector UI:R): a user opening a crafted .url file, typically delivered via phishing, causes Windows to fetch and run content from the attacker-specified location, yielding remote code execution with high impact on confidentiality, integrity, and availability (CVSS 3.1: 8.8). All supported Windows 10 and Windows 11 client versions and Windows Server 2008, 2012, 2016, and 2019 are affected. The flaw is being actively exploited: it was added to CISA's Known Exploited Vulnerabilities catalog on 2025-06-10, Microsoft patched it in the June 2025 Patch Tuesday release, and Check Point research tied it to a cyber-espionage campaign by the Stealth Falcon actor against a major Turkish defense organization. EPSS estimates an 85.4% probability of exploitation within 30 days (100th percentile).

What to do: Apply Microsoft's June 2025 security updates to all affected Windows 10/11 clients and Windows Server 2008/2012/2016/2019 hosts, consistent with the KEV required action and BOD 22-01 timelines for federal agencies. Until patched, consider disabling the Windows WebDAV client where it is not needed and treat unsolicited .url shortcut files as untrusted; given confirmed espionage use, hunt for signs of exploitation on high-value endpoints.