Microsoft Windows Kernel Privilege Escalation Vulnerability

ALTO 7.8EXPLOITED (CISA KEV)CVE-2021-33771 · Published 14/07/2021 · updated 10/08/2026

Microsoft Windows Kernel Privilege Escalation Vulnerability. Actively exploited: CISA added this vulnerability to its Known Exploited Vulnerabilities catalog on 03/11/2021. Patch affected systems as an emergency.

En resumen

CVE-2021-33771 es una vulnerabilidad ALTO (CVSS 7.8).
Explotada activamente: CISA la añadió al catálogo KEV el 03/11/2021.
Probabilidad de explotación en los próximos 30 días (EPSS): 10.2%, mayor que el 95.7% de las vulnerabilidades.
Aún no hay una versión corregida: sigue el aviso del fabricante en Referencias.

Package	Affected versions	Patched versions
Windows Microsoft	Versions not published yet (product named by CISA KEV)

Description

Windows Kernel Elevation of Privilege Vulnerability

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2021-33771 · Patch
portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-33771 · Patch
cisa.gov/known-exploited-vulnerabilities-catalog · US Government Resource
CISA KEV · CVE-2021-33771

Running one of these products? Scan your site to see whether it exposes a vulnerable version.

Scan my site free