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CVE-2021-28310 is a Windows local elevation-of-privilege vulnerability in the Desktop Window Manager component, specifically an out-of-bounds write in dwmcore.dll reachable through the DirectComposition API. The flaw stems from insufficient bounds checking when processing DirectComposition property updates for the D2DVector2 expression type. In the vulnerable path, CPropertySet::UpdateProperty<D2DVector2> in dwmcore.dll does not properly verify that the supplied property identifier is within the number of properties assigned to the resource. Although kernel-mode validation in win32kbase.sys normally constrains invalid property updates, attackers can abuse inconsistencies between kernel-mode and user-mode property handling to create a mismatch in property counts for the same resource. That inconsistency allows malicious SetResourceBufferProperty operations to reach Desktop Window Manager and perform a controlled out-of-bounds write at a controlled offset. Reported exploitation involved heap grooming and placement of fake properties to bypass additional checks and turn the memory corruption into code execution. The vulnerability was observed exploited in the wild and is assessed as suitable for use in exploit chains to escape browser sandboxes or elevate privileges to SYSTEM.
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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.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A zero-day vulnerability previously leveraged by Bitter APT in earlier campaigns.
A vulnerability in Microsoft Desktop Window Manager (DWM) referenced as a zero-day used by Bitter in 2021 (mentioned as prior activity, not necessarily part of the Bangladesh campaign’s initial infection chain).
An out-of-bounds write elevation-of-privilege zero-day in dwmcore.dll within Desktop Window Manager (dwm.exe), exploitable via the DirectComposition API to gain code execution/system privileges.
An elevation of privilege vulnerability in Win32k that the content states has been exploited.
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.