CVE-2020-8341: Lenovo Thinkpad t490 (20nx) Firmware

Low severity, CVSS 2.4. EPSS: 0.3% chance of exploitation in the next 30 days.

In Lenovo systems, SMM BIOS Write Protection is used to prevent writes to SPI Flash. While this provides sufficient protection, an additional layer of protection is provided by SPI Protected Range Registers (PRx). After resuming from S3 sleep mode in various versions of BIOS for some Lenovo ThinkPad systems, the PRx is not set. This does not impact the SMM BIOS Write Protection, which keeps systems protected.

Affected products

• Lenovo Thinkpad t490 (20nx) Firmware: before n2iet90w (fixed in n2iet90w)
• Lenovo Thinkpad t490 (20qx) Firmware: before n2iet90w (fixed in n2iet90w)
• Lenovo Thinkpad t490 (20rx) Firmware: before n2ret16w (fixed in n2ret16w)
• Lenovo Thinkpad t490s (20nx) Firmware: before n2jet89w (fixed in n2jet89w)
• Lenovo Thinkpad t495 Drift Firmware: before 2020-08-30 (fixed in 2020-08-30)
• Lenovo Thinkpad t590 (20nx) Firmware: before n2iet90w (fixed in n2iet90w)
• Lenovo Thinkpad x1 Carbon (20qx) Firmware: before n2het54w (fixed in n2het54w)
• Lenovo Thinkpad x1 Yoga (20qx) Firmware: before n2het54w (fixed in n2het54w)
• Lenovo Thinkpad x390 (20qx) Firmware: before n2jet89w (fixed in n2jet89w)
• Lenovo Thinkpad x390 (20sx) Firmware: before n2set18w (fixed in n2set18w)

Published 2020-09-01. Last modified 2026-06-17.