Skip to content
EXYS
Back to the CVEs

CVE-2021-21551

7.8, high Known exploited

Dell dbutil Driver Insufficient Access Control Vulnerability

NVD (opens in a new tab) CVE.org (opens in a new tab) CISA KEV catalogue (opens in a new tab)
CVSS
7.8, high high CVSS v3.1
EPSS, next 30 days
79% higher than 99.5% of scored CVEs
Exploitation
Confirmed in the wild
Published
4 May 20215 years ago

Known exploited

CISA added this to the Known Exploited Vulnerabilities Catalog on 31 Mar 2022. US federal agencies had to remediate by 21 Apr 2022, a deadline that has passed.

Required action. Apply updates per vendor instructions.

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.

Details

Vendor
Dell
Product
dbutil
Weakness
CWE-782 (opens in a new tab)
Status
Analyzed
Updated
17 Jun 2026
Assigner
security_alert@emc.com

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

References 4

Exploit code 2

Advisories 1

Other references 1

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other Dell CVEs

Every Dell CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2026-22769 Dell RecoverPoint for Virtual Machines (RP4VMs) Use of Hard-coded Credentials Vulnerability KEV EPSS 14% 10, critical
  • CVE-2026-76779 Dell Secure Connect Gateway (SCG) Policy Manager, versions prior to 5.34.00.16, contains an Improper Restriction of Excessive… EPSS 0.3% 9.8, critical
  • CVE-2026-76769 Dell Secure Connect Gateway (SCG) Policy Manager Missing Authorization Vulnerability EPSS 0.2% 8.8, high
  • CVE-2026-78018 Dell Secure Connect Gateway (SCG) Policy Manager, versions prior to 5.34.00.16, contains an Initialization of a Resource with an… EPSS <0.1% 7.1, high
  • CVE-2026-78019 Dell Secure Connect Gateway (SCG) Policy Manager, versions prior to 5.34.00.16, contains an Inclusion of Functionality from Untrusted… EPSS 0.3% 8.8, high
  • CVE-2026-78022 Dell Secure Connect Gateway (SCG) Policy Manager, versions prior to 5.34.00.16, contains a Not Failing Securely ('Failing Open')… EPSS 0.2% 8.1, high
  • CVE-2026-78024 Dell Secure Connect Gateway (SCG) Policy Manager Server-Side Request Forgery Vulnerability EPSS 0.2% 8.7, high
  • CVE-2026-78339 Dell Secure Connect Gateway (SCG) Policy Manager Incorrect Permission Assignment for Critical Resource Vulnerability EPSS <0.1% 7.1, high

Beyond this page

Is CVE-2021-21551 in your network?

This page tells you how dangerous CVE-2021-21551 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

CVE-2021-21551 is in the CISA catalogue of exploited vulnerabilities: attackers are already exploiting it.

  • EXYS7600 OCELOT

    Find it before attackers do

    Ocelot scans your network on a schedule and reports every vulnerability it finds by its CVE identifier, with its CVSS score and how many of your hosts are affected. A finding like CVE-2021-21551 comes with the devices to patch.

    Learn more about EXYS7600 OCELOT

  • EXYS7950 KONDRA

    Detect it if it's exploited

    Until the patch is applied, Kondra monitors your network, events and endpoints in real time. It keeps an inventory of the software installed on every endpoint, and its anomaly detection rules flag what an attacker does once inside.

    Learn more about EXYS7950 KONDRA
Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 17 Oct 2026, not the live upstream state.