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CVE-2025-55681 is a local elevation-of-privilege vulnerability in the Windows Desktop Window Manager (DWM). The flaw is described as an out-of-bounds read in the DWM component, specifically in dwmcore.dll, with reporting indicating the vulnerable code path is in the CBrushRenderingGraphBuilder::AddEffectBrush function. Improper buffer handling during processing of crafted input can cause out-of-bounds memory access, enabling an authorized local attacker to leverage the condition to elevate privileges. A successful exploit can result in execution with SYSTEM privileges on affected Windows 10, Windows 11, and related Windows Server editions.
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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.
8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A critical out-of-bounds memory access vulnerability in the Desktop Window Manager (dwmcore.dll) allows local attackers to escalate privileges to SYSTEM on all supported Windows 10, Windows 11, and Windows Server versions. Exploitation requires local access but no user interaction, making it highly dangerous in enterprise environments.
One of 11 important vulnerabilities considered more likely to be exploited, ranging from remote code execution to privilege escalation across desktop and cloud environments.
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.