CVE-2021-1732: Microsoft Win32k Privilege Escalation Vulnerability

CVE-2021-1732 · Severity: critical · CVSS 7.8 · Exploited in the wild · Published 2021-11-03

A privilege escalation vulnerability exists in the Microsoft Win32k component due to an out-of-bounds write (CWE-787) or offset confusion. An attacker with local access can exploit this to gain elevated system privileges.

Technologies: Microsoft Win32K. Vendors: Microsoft.

Quick answers

Is CVE-2021-1732 exploited in the wild?
Yes. CVE-2021-1732 is known to be exploited in the wild, first recorded on 3 November 2021. Treat it as urgent.
How severe is CVE-2021-1732?
Critical severity, with a CVSS score of 7.8, published 3 November 2021.
Which products and versions are affected?
Microsoft Windows 10 1803, 1809, 1909, 2004, 20H2; Microsoft Windows Server 1909, 2004, 20H2, 2019.
Is there a fix for CVE-2021-1732?
A patch was published on 2021-02-24: Microsoft released security updates to address the vulnerability. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2021-1732 attacked?
It is attacked with local access, in an operating system.
Am I affected by CVE-2021-1732?
Check whether you run Microsoft Win32K. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Affected products

  • Microsoft Windows 10 1803, 1809, 1909, 2004, 20H2
  • Microsoft Windows Server 1909, 2004, 20H2, 2019

Timeline

  • 2021-02-24: patched: Microsoft released security updates to address the vulnerability.
  • 2021-11-03: kev added: Added to CISA's Known Exploited Vulnerabilities Catalog.
  • 2021-11-03: disclosed: Publicly disclosed and published to NVD.
  • 2021-11-03: exploited: Confirmed as exploited in the wild per CISA KEV catalog.

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