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Dell iDRAC

CVE-2021-21540

high 8.1CVSS 3.1 · published 2021-04-30 · modified 2026-06-17

Dell EMC iDRAC9 versions prior to 4.40.00.00 contain a stack-based overflow vulnerability. A remote authenticated attacker could potentially exploit this vulnerability to overwrite configuration information by injecting arbitrarily large payload.

Affected versions (NVD)

ProductVersions
idrac9_firmware< 4.40.00.00

What to do

NVD marks firmware before these versions as affected: idrac9_firmware before 4.40.00.00. The usual fix is to update to that version or later. Vendors patch each firmware branch separately, so confirm the fixed build for your branch in the advisory.

Vendor advisory (from the NVD record): www.dell.com/support/kbdoc/000185293 · www.dell.com/support/kbdoc/000185293.

How this page decided
Severity and CVSS: the primary NVD score (version 3.1). Affected versions: the CPE ranges in the NVD record, modified 2026-06-17. Exploited: the CISA KEV field of the NVD record. Whether you are affected needs your firmware version; this page does not know it. It is not tested against a device.

Do you run it?

Paste your BMC's Redfish answers into the Redfish Inspector: it compares the firmware version with the NVD ranges, in your browser. Or scan every BMC with the free scan.

Source: NVD CVE-2021-21540. PWX for iDRAC

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