CVE-2021-21573: Dell Alienware m15 r6 Firmware

High severity, CVSS 7.5. EPSS: 0.3% chance of exploitation in the next 30 days.

Dell BIOSConnect feature contains a buffer overflow vulnerability. An authenticated malicious admin user with local access to the system may potentially exploit this vulnerability to run arbitrary code and bypass UEFI restrictions.

Affected products

• Dell Alienware m15 r6 Firmware: before 1.3.3 (fixed in 1.3.3)
• Dell Chengming 3990 Firmware: before 1.4.1 (fixed in 1.4.1)
• Dell Chengming 3991 Firmware: before 1.4.1 (fixed in 1.4.1)
• Dell g15 5510 Firmware: before 1.4.0 (fixed in 1.4.0)
• Dell g15 5511 Firmware: before 1.3.3 (fixed in 1.3.3)
• Dell g3 3500 Firmware: up to and including 1.9.0
• Dell g5 5500 Firmware: before 1.9.0 (fixed in 1.9.0)
• Dell g7 7500 Firmware: before 1.9.0 (fixed in 1.9.0)
• Dell g7 7700 Firmware: before 1.9.0 (fixed in 1.9.0)
• Dell Inspiron 14 5418 Firmware: before 2.1.0_a06 (fixed in 2.1.0_a06)
• Dell Inspiron 15 5518 Firmware: before 2.1.0_a06 (fixed in 2.1.0_a06)
• Dell Inspiron 15 7510 Firmware: before 1.0.4 (fixed in 1.0.4)
• Dell Inspiron 3501 Firmware: before 1.6.0 (fixed in 1.6.0)
• Dell Inspiron 3880 Firmware: before 1.4.1 (fixed in 1.4.1)
• Dell Inspiron 3881 Firmware: before 1.4.1 (fixed in 1.4.1)
• Dell Inspiron 3891 Firmware: before 1.0.11 (fixed in 1.0.11)
• Dell Inspiron 5300 Firmware: before 1.7.1 (fixed in 1.7.1)
• Dell Inspiron 5301 Firmware: before 1.8.1 (fixed in 1.8.1)
• Dell Inspiron 5310 Firmware: before 2.1.0 (fixed in 2.1.0)
• Dell Inspiron 5400 2-In-1 Firmware: before 1.7.0 (fixed in 1.7.0)
• Dell Inspiron 5400 Aio Firmware: before 1.4.0 (fixed in 1.4.0)
• Dell Inspiron 5401 Aio Firmware: before 1.4.0 (fixed in 1.4.0)
• Dell Inspiron 5401 Firmware: before 1.7.2 (fixed in 1.7.2)
• Dell Inspiron 5402 Firmware: before 1.5.1 (fixed in 1.5.1)
• Dell Inspiron 5406 2n1 Firmware: before 1.5.1 (fixed in 1.5.1)
• and 103 more

Published 2021-06-24. Last modified 2026-06-17.