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CVE-2025-21247 is a security feature bypass vulnerability in the Windows MapUrlToZone component caused by improper resolution of path equivalence. The flaw allows Windows to incorrectly determine the security zone associated with a resource when equivalent path representations are used, which can undermine trust and origin-based protections that rely on accurate zone classification. By abusing this path handling weakness over a network, an attacker can cause content to be treated as if it originated from a less restrictive or more trusted zone than intended, bypassing security controls enforced through MapUrlToZone.
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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.
4 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A MapUrlToZone security feature bypass vulnerability included in the March Microsoft patches and listed by Microsoft as more likely to be exploited within 30 days.
A MapUrlToZone security feature bypass vulnerability listed in the summary table.
Security feature bypass vulnerability in MapUrlToZone.
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.