Remote Code Execution in Windows Resilient File System (ReFS)
CVE-2025-62456 is a heap-based buffer overflow vulnerability in Windows Resilient File System (ReFS). According to the provided content, the flaw allows code execution over a network and is classified as a remote code execution vulnerability. The issue is described as affecting Windows ReFS and arising from a heap-based buffer overflow condition, consistent with CWE-122. Microsoft disclosed it as part of the December 2025 security updates, and the available context indicates a CVSS v3.1 base score of 8.8.
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
If you can’t patch tonight, do this now.
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
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.
Recent activity
10 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.
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.