What’s Vulnerable › Vulnerabilities

CVE-2020-8341

• Severity: low (CVSS 2.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-09-01 · updated 2026-06-17

Description

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

How to fix

Upgrade to a fixed version: Lenovo Thinkpad T490 (20Nx) Firmware n2iet90w; Lenovo Thinkpad T490 (20Qx) Firmware n2iet90w; Lenovo Thinkpad T490 (20Rx) Firmware n2ret16w; Lenovo Thinkpad T490S (20Nx) Firmware n2jet89w; Lenovo Thinkpad T495 Drift Firmware 2020-08-30; Lenovo Thinkpad T590 (20Nx) Firmware n2iet90w; Lenovo Thinkpad X1 Carbon (20Qx) Firmware n2het54w; Lenovo Thinkpad X1 Yoga (20Qx) Firmware n2het54w; Lenovo Thinkpad X390 (20Qx) Firmware n2jet89w; Lenovo Thinkpad X390 (20Sx) Firmware n2set18w. Check the vendor advisory for mitigations.

References

• https://support.lenovo.com/us/en/product_security/LEN-30042
• https://support.lenovo.com/us/en/product_security/LEN-30042

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