CVE-2021-21540: Dell IDRAC9 Firmware

High severity, CVSS 8.1. EPSS: 1.2% chance of exploitation in the next 30 days.

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 products

• Dell IDRAC9 Firmware: before 4.40.00.00 (fixed in 4.40.00.00)

Published 2021-04-30. Last modified 2026-06-17.