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CVE-2021-40449: Microsoft Windows Win32k Privilege Escalation Vulnerability

criticalknown exploitedpublic exploitCVE-2021-40449
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
Unspecified vulnerability allows for an authenticated user to escalate privileges.

CSIRTS triage

vendor: Microsoftproduct: WindowsPrivilege escalation
What
The vulnerability allows an authenticated user to escalate privileges.
Who is affected
Authenticated users of Microsoft Windows are affected.
Urgency
Remediation is urgent due to active exploitation and critical severity.
Action
Apply the latest security updates from Microsoft.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2021-11-17
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2021-40449

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2021-40449coverage & exploitation statusNVD · CVE.org

Recent advisories for Microsoft Windows Win32k

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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