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CVE-2019-0859: Microsoft Win32k Privilege Escalation Vulnerability

criticalknown exploitedpublic exploitCVE-2019-0859
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.
Microsoft Win32k fails to properly handle objects in memory causing privilege escalation. Successful exploitation allows an attacker to run code in kernel mode.

CSIRTS triage

vendor: Microsoftproduct: Win32kPrivilege escalation
What
The vulnerability allows an attacker to run code in kernel mode.
Who is affected
Deployments of Microsoft Win32k are affected.
Urgency
Remediation is urgent due to active exploitation and critical severity.
Action
Apply the latest security patch 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
2021-11-03
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2019-0859

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-2019-0859coverage & exploitation statusNVD · CVE.org

Recent advisories for Microsoft Win32k Privilege

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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