Elevation of Privilege in Windows Cloud Files Mini Filter Driver
CVE-2025-62457 is an out-of-bounds read vulnerability in the Windows Cloud Files Mini Filter Driver (cldflt.sys). The issue affects the Cloud Files driver’s handling of cloud file I/O operations and can be triggered by a local authorized attacker. Microsoft classifies the flaw as an elevation of privilege vulnerability in the same driver cluster as CVE-2025-62221 and CVE-2025-62454. Available reporting indicates the bug arises from filter driver mishandling during cloud file operations, resulting in an out-of-bounds read condition that can be leveraged for local privilege escalation.
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Impact, mitigation & remediation
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Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
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Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Affected products & vendors
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An elevation-of-privilege vulnerability in the Windows Cloud Files Mini Filter Driver (cldflt.sys) that allows local privilege escalation through mishandling during cloud file I/O. Exploitation is considered unlikely but possible due to shared codebase with other actively exploited flaws.
A local elevation of privilege vulnerability in the Windows Cloud Files Mini Filter Driver, considered unlikely to be exploited.
Specific Microsoft vulnerability affecting Windows Cloud Files Mini Filter Driver listed in the December 2025 Security Updates.
A Microsoft December 2025 security update vulnerability affecting Windows Cloud Files Mini Filter Driver.
The version that knows your environment.
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.