CVE-2021-33771
KEVMicrosoft Windows Kernel Privilege Escalation Vulnerability
Description
Microsoft Windows kernel contains an unspecified vulnerability that allows for privilege escalation.
Windows Kernel Elevation of Privilege Vulnerability
CVSS 3.1 vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HPublishedJul 14, 2021
Last modifiedAug 10, 2026
Added to KEVNov 3, 2021
Remediation dueNov 17, 2021
References
- msrc.microsoft.com/update-guide/vulnerability/CVE-2021-33771PatchVendor Advisory
- portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-33771PatchVendor Advisory
- cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-33771US Government Resource
0 recent articles mention this CVE
70
Risk assessment · High
Actively exploited. Patch immediately.
- Exploitation
- Confirmed in the wild (CISA KEV)
- Federal remediation deadline
- Overdue by 1804 days
- CVSS
- 7.8 HIGH
- EPSS (30-day exploit probability)
- 10.2% · top 4% of all CVEs
- Weakness
- NVD-CWE-noinfo
Recommended actions
- 1.Apply updates per vendor instructions.
- 2.Treat as emergency change: patch or isolate internet-facing instances first.
- 3.Hunt for compromise: review logs for the disclosure window, not just from the patch date.
Assessment is derived automatically from the live signals above; verify against your own asset inventory.