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CVE-2025-49677 is a local elevation-of-privilege vulnerability in the Microsoft Brokering File System caused by a use-after-free condition. The flaw stems from improper memory management during object lifecycle handling, where file-handle closure can leave stale references to freed memory. Under exploitable conditions, a local authorized attacker can trigger the vulnerable state through crafted file closure activity and attempt to reclaim or manipulate the freed kernel memory before it is safely invalidated. Available technical reporting indicates exploitation may involve corruption of kernel object state, including virtual function table pointers, to redirect execution in kernel context. Microsoft assessed exploitation as less likely because successful exploitation requires winning a race condition, reflecting high attack complexity.
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No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
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.
3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A local privilege escalation vulnerability caused by a use-after-free flaw in Microsoft's Brokering File System that can allow attackers with local access to gain SYSTEM-level privileges.
A Microsoft Brokering File System elevation of privilege vulnerability caused by a use-after-free condition that allows a locally authorized attacker to gain SYSTEM privileges.
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.