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CVE-2025-21391 is an elevation-of-privilege vulnerability in the Windows Storage component caused by improper link resolution before file access. The flaw is described as an improper handling of symbolic links or similar link references during privileged file operations, allowing a locally authenticated attacker to redirect file access in a way that results in deletion of targeted files on the file system. Available reporting characterizes the issue as enabling privilege escalation through abuse of Windows Storage file-handling logic rather than direct code execution. The vulnerability was reported as actively exploited in the wild at the time of disclosure.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Windows Storage elevation of privilege vulnerability.
A Windows Storage elevation of privilege vulnerability that is actively exploited in the wild and can allow deletion of targeted files without user interaction.
A previously referenced Microsoft symbolic link vulnerability mentioned only as a similar historical issue.
Повышение привилегий в Windows Storage, позволяющее удалять определенные файлы и потенциально приводящее к недоступности системы.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.