Is CVE-2021-21551 in the CISA KEV catalog?

Yes. CVE-2021-21551 is on the CISA Known Exploited Vulnerabilities list, added 2022-03-31.

What is the CVSS severity of CVE-2021-21551?

CVE-2021-21551 has a CVSS v3 base score of 8.8 (HIGH).

What is the EPSS score for CVE-2021-21551?

CVE-2021-21551 has an EPSS score of 58.13% (99th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix or mitigate CVE-2021-21551?

No published fix for CVE-2021-21551 has been found yet. It is on the CISA Known Exploited Vulnerabilities list; federal agencies must remediate by 2022-04-21. Apply the vendor's mitigations per CISA's guidance.

CVE & CISA-KEV Catalog

CVE-2021-21551

HIGHCISA KEVEPSS 99th pctl

8.8

CVSS v3

NVD

Description

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.

CWE-782

How to fix

Actively exploited, no published fix found yet

CISA required action: Apply updates per vendor instructions.

Federal remediation due: 2022-04-21

Mitigation guidance may be in the linked vendor advisories in the References section below.

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CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeChanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

58.13%probability of exploitation in 30 days

99thpercentile

Very high risk: more likely to be exploited than 99% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

Dell dbutil Driver Insufficient Access Control Vulnerability

Dell dbutil driver contains an insufficient access control vulnerability which may lead to escalation of privileges, denial-of-service (DoS), or information disclosure.

Apply updates per vendor instructions.

Remediation due: 2022-04-21

References

Exploit2

Vendor Advisory1

dell.com

Government Resource1

cisa.gov

Related Vulnerabilities

Other CWE-782 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2025-7771	Unscored	-	6.8%	-	-
CVE-2024-32370	Critical	9.8	1.0%	-	Fix
CVE-2024-30804	Critical	9.8	0.8%	-	-
CVE-2024-39251	Critical	10.0	0.7%	-	-
CVE-2024-33220	High	8.8	0.7%	-	-
CVE-2026-36355	High	7.7	0.7%	-	-

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-10-28.