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.
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Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2022-03-31), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 8.8 retained for reference. Confidence: HIGH.
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.
May 4, 2021
October 28, 2025
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.
Working exploit code is in the public domain (1 Metasploit module) (7 GitHub PoCs) (1 Exploit-DB entry). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.
Dell Driver EoP (CVE-2021-21551)
Open source ↗Cobalt Strike (CS) Beacon Object File (BOF) foundation for kernel exploitation using CVE-2021-21551.
Open source ↗Dell Driver EoP (CVE-2021-21551)
Open source ↗An extended proof-of-concept for the CVE-2021-21551 Dell ‘dbutil_2_3.sys’ Kernel Exploit
Open source ↗arbitrary kernel read/write in dbutil_2_3.sys, Proof of Concept Local Privilege Escalation to nt authority/system
Open source ↗DELL dbutil_2_3.sys 2.3 - Arbitrary Write to Local Privilege Escalation (LPE)
Open source ↗Exploit to SYSTEM for CVE-2021-21551
Open source ↗Dell DBUtil_2_3.sys IOCTL memmove
Open source ↗See which npm, PyPI, Go, and Maven packages are affected by CVE-2021-21551
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CWE-863