Live › vulnerability › CVE-2021-33771
Go to dashboardA flaw in the Windows kernel lets a local user escalate privileges on the machine. CISA lists it as actively exploited, so an attacker who already has a foothold can reach SYSTEM.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-10-23 19:11 UTC, 3h before NVD. All times on this page are UTC.
Apply updates per vendor instructions.
| Product | Ecosystem | Affected | Fixed in |
|---|---|---|---|
| Microsoft Windows | vendor | – | – |
Unknown from the sources. In the analyst’s queue.
Apply the Microsoft Windows security update per vendor instructions, as CISA requires; the sources do not name the patched build.
Each row is the first time that source carried this signal. The analyst’s rows are its own findings.
Microsoft Windows kernel contains an unspecified vulnerability that allows for privilege escalation.
CISA required action: Apply updates per vendor instructions.
This page as .md · .json · in your agent: get_signal("CVE-2021-33771")
CISA KEV catalog, Creative Commons 0 · EPSS scores by FIRST, used with attribution · NVD data is provided by NIST and is public domain. Posts quoted belong to their authors.