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Vulnerability record · CVE-2020-8341 · published 1 September 2020

CVE-2020-8341: Lenovo thinkpad t490 \(20nx\) firmware vulnerability

Lenovo · Thinkpad T490 \(20nx\) Firmware

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.

2.4 CVSS 3.1 Low EPSS 0.35% · top 73.2%
2.4CVSS 3.1 base score, v2 2.1
0.35%EPSS exploitation probability, 30 days
NoNot in CISA KEV
10Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Affected products

10 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://support.lenovo.com/us/en/product_security/LEN-30042 Vendor Advisory
https://support.lenovo.com/us/en/product_security/LEN-30042 Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

6.8CVE-2020-8335Lenovo thinkpad a275 firmware vulnerabilityThe BIOS tamper detection mechanism was not triggered in Lenovo ThinkPad A285, BIOS versions up to r0xuj70w; A485, BIOS versions up to r0wuj65w; T495…EPSS 0.31%6.8CVE-2020-8336Lenovo thinkpad e14 firmware vulnerabilityLenovo implemented Intel CSME Anti-rollback ARB protections on some ThinkPad models to prevent roll back of CSME Firmware in flash.EPSS 0.30%

Source: NIST National Vulnerability Database (record CVE-2020-8341), CISA KEV, FIRST EPSS (scores of 2026-10-17). This page is refreshed as NVD updates the record.