CVE-2021-21551

CVE Enrichment

CVSS: 7.8 HIGH
EPSS: 79.25%
EPSS Percentile: 99.59%
CISA KEV: YES — Known Exploited Vulnerability

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.

Technical Details

CVSS Version: 3.1
CNA / NVD Source: security_alert@emc.com
Published: 04-May-2021 23:15
Last Modified: 17-Jun-2026 10:35
EPSS Date: 2026-10-10
CWE: CWE-782

CVSS Vector


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

CISA KEV Details

Date Added: 2022-03-31
Remediation Due: 2022-04-21
Known Ransomware Campaign Use: Unknown
Required Action: Apply updates per vendor instructions.
Notes: https://nvd.nist.gov/vuln/detail/CVE-2021-21551

Affected Products / Versions

dell / dbutil
Version / affected range: * · through (inclusive) 2.3
cpe:2.3:a:dell:dbutil:*:*:*:*:*:*:*:*

References

Last enrichment sync: 12-Oct-2026 14:21
Sources: NVD · FIRST EPSS · CISA KEV
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Reported Context (1)

For instance, the North Korean Lazarus hacking group deployed a Windows rootkit on victims' systems by exploiting an insufficient access control vulnerability (CVE-2021-21551) in the Dell dbutil driver. Critical Dell System Update flaw lets remote attackers gain root access

CVE (8)

Malware (2)

Threat Actors (3)

MITRE ATT&CK (1)

Vendors (1)

Products (6)

Industries (1)

Countries (2)

Note: Related entities, including threat actors, malware, CVEs, MITRE ATT&CK techniques, vendors, products, tools, countries, and industries, are shown when they appear in the same reporting. Their presence does not necessarily mean they were targeted, compromised, vulnerable, responsible for the activity, or directly involved in the incident.