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CVE-2025-62456 is a heap-based buffer overflow vulnerability in Windows Resilient File System (ReFS). The flaw can be triggered over the network by an authorized attacker and may result in remote code execution. Available reporting identifies the issue as a memory corruption condition in ReFS consistent with improper bounds handling on heap memory during processing of attacker-controlled input. The vulnerability was disclosed as part of Microsoft's December 2025 security updates and has been described as high severity with a CVSS 3.1 base score of 8.8.
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What an attacker gets, and what they’ve been doing with it.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
11 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Windows ReFS heap-based buffer overflow enabling remote code execution over a network by an authorized attacker; Microsoft assesses in-the-wild exploitation as unlikely.
A heap-based buffer overflow vulnerability in Windows Resilient File System (ReFS) that allows an authorized attacker to execute code remotely over a network. The vulnerability is rated high severity (CVSS 8.8) and requires network access and valid credentials (PR:L).
A high-severity vulnerability in the Windows Resilient File System with a CVSS score of 8.8.
Specific Microsoft vulnerability affecting Windows Resilient File System (ReFS) listed in the December 2025 Security Updates.
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.