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CVE-2017-0263 is a local privilege escalation vulnerability in the Win32k kernel subsystem of Microsoft Windows, affecting multiple Windows client and server releases including Windows 7 SP1 through Windows 10 and corresponding server versions. Available technical reporting identifies the flaw as a use-after-free condition in win32k, specifically involving window object destruction in the xxxDestroyWindow code path. Exploitation uses a crafted local application to trigger the stale object condition and corrupt kernel-managed window structures. Public analyses of in-the-wild exploitation describe use of the User32 HMValidateHandle technique to leak kernel addresses associated with window objects, followed by manipulation of window-related state to achieve controlled kernel memory access. Observed exploit chains used the vulnerability after initial code execution from a document exploit in order to escape the FLTLDR.EXE sandbox and elevate the attacker-controlled process. The vulnerability was exploited as a zero-day by APT28/Sednit/Sofacy in 2017.
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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.
11 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Referenced earlier Windows exploit used as historical comparison for shellcode-based exploitation approaches.
A Windows kernel local privilege escalation zero-day caused by a use-after-free in win32k!xxxDestroyWindow.
A Windows/Office vulnerability used in Silence spear-phishing operations to implant malware on victim systems.
A Microsoft Windows local privilege escalation (LPE) zero-day used alongside Office EPS exploitation in targeted attacks.
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.