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CVE-2021-21551

High CVSS 8.8 Known exploited

Published 2021-05-04 · last changed 2026-06-17 · added to CISA KEV 2022-03-31

This one is being exploited in the wild.

CISA added CVE-2021-21551 to the Known Exploited Vulnerabilities catalog on 2022-03-31. Federal agencies are required to remediate it on a deadline. If you have affected machines, this is the class of finding that moves ahead of the rest of the queue.

The fix

We hold no Microsoft remediation data for CVE-2021-21551, which normally means it is not a Windows CVE. For non-Microsoft software the fix is the vendor's own updated release, and the affected versions are listed below.

What it is

Dell dbutil_2_3.sys driver contains an insufficient access control vulnerability which may lead to escalation of privileges, denial of service, or information disclosure. Local authenticated user access is required.

Sources

CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H