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CVE-2020-0986 is a Windows local elevation-of-privilege vulnerability in the GDI Print/Print Spooler API, specifically in the splwow64 printing compatibility process used when 32-bit applications print on 64-bit Windows. The flaw is described as an arbitrary pointer dereference caused by improper handling of objects in memory. In the vulnerable path, attacker-controlled LPC request data reaches the GdiPrinterThunk handler for the DocumentEvent operation, where insufficient validation allows control over memcpy arguments in the more privileged splwow64.exe process. Public technical analysis describes the issue as enabling manipulation of memory in splwow64.exe, including abuse of the encoded fpDocumentEvent function pointer to redirect execution and achieve arbitrary code execution in that process. The vulnerability has been characterized as a close variant of CVE-2019-0880, affecting a similar code path and bug class.
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No public exploit code observed for this vulnerability.
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A referenced vulnerability mentioned only in citations without substantive discussion in the content.
A previously exploited vulnerability cited as background context on Magnitude's historical preference for vulnerabilities first used as zero-days.
A Windows memory corruption vulnerability in splwow64.exe used by Magnitude for local privilege escalation and escape from Internet Explorer's Enhanced Protected Mode sandbox.
A Windows splwow64 arbitrary pointer dereference enabling attacker control of memcpy arguments from a less-privileged process; described as exploited in the wild, a trivial variant of CVE-2019-0880, and initially incompletely patched.
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Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.