CVE-2021-21539: Dell IDRAC9 Firmware

High severity, CVSS 7.1. EPSS: 0.6% chance of exploitation in the next 30 days.

Dell EMC iDRAC9 versions prior to 4.40.00.00 contain a Time-of-check Time-of-use (TOCTOU) race condition vulnerability. A remote authenticated attacker could potentially exploit this vulnerability to gain elevated privileges when a user with higher privileges is simultaneously accessing iDRAC through the web interface.

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.