What’s Vulnerable › Vulnerabilities

CVE-2021-3972

• Severity: medium (CVSS 6.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-04-22 · updated 2026-06-17
• Weakness: CWE-489

Description

A potential vulnerability by a driver used during manufacturing process on some consumer Lenovo Notebook devices' BIOS that was mistakenly not deactivated may allow an attacker with elevated privileges to modify secure boot setting by modifying an NVRAM variable.

Affected products

• Lenovo Ideapad 3-14Ada05 Firmware: before e8cn33ww — fixed in e8cn33ww
• Lenovo Ideapad 3-14Ada6 Firmware: before hbcn21ww — fixed in hbcn21ww
• Lenovo Ideapad 3-14Alc6 Firmware: before glcn43ww — fixed in glcn43ww
• Lenovo Ideapad 3-14Are05 Firmware: before dzcn42ww — fixed in dzcn42ww
• Lenovo Ideapad 3-14Igl05 Firmware: before emcn52ww — fixed in emcn52ww
• Lenovo Ideapad 3-14Iil05 Firmware: before dvcn23ww — fixed in dvcn23ww
• Lenovo Ideapad 3-14Iml05 Firmware: before dxcn41ww — fixed in dxcn41ww
• Lenovo Ideapad 3-14Itl05 Firmware: before gccn26ww — fixed in gccn26ww
• Lenovo Ideapad 3-14Itl6 Firmware: before ggcn33ww — fixed in ggcn33ww
• Lenovo Ideapad 3-15Ada05 Firmware: before e8cn33ww — fixed in e8cn33ww
• Lenovo Ideapad 3-15Ada6 Firmware: before hbcn21ww — fixed in hbcn21ww
• Lenovo Ideapad 3-15Alc6 Firmware: before glcn43ww — fixed in glcn43ww
• Lenovo Ideapad 3-15Are05 Firmware: before dzcn42ww — fixed in dzcn42ww
• Lenovo Ideapad 3-15Igl05 Firmware: before dvcn23ww — fixed in dvcn23ww
• Lenovo Ideapad 3-15Iil05 Firmware: before emcn52ww — fixed in emcn52ww
• Lenovo Ideapad 3-15Iml05 Firmware: before dxcn41ww — fixed in dxcn41ww
• Lenovo Ideapad 3-15Itl05 Firmware: before gccn26ww — fixed in gccn26ww
• Lenovo Ideapad 3-15Itl6 Firmware: before ggcn33ww — fixed in ggcn33ww
• Lenovo Ideapad 3-17Ada05 Firmware: before e8cn33ww — fixed in e8cn33ww
• Lenovo Ideapad 3-17Ada6 Firmware: before hbcn21ww — fixed in hbcn21ww
• Lenovo Ideapad 3-17Alc6 Firmware: before glcn43ww — fixed in glcn43ww
• Lenovo Ideapad 3-17Are05 Firmware: before dzcn42ww — fixed in dzcn42ww
• Lenovo Ideapad 3-17Iil05 Firmware: before emcn52ww — fixed in emcn52ww
• Lenovo Ideapad 3-17Iml05 Firmware: before dxcn41ww — fixed in dxcn41ww
• Lenovo Ideapad 3-17Itl6 Firmware: before ggcn33ww — fixed in ggcn33ww
• Lenovo Ideapad 5-15Are05 Firmware: before e7cn44ww — fixed in e7cn44ww
• Lenovo Ideapad 5-15Iil05 Firmware: before dpcn54ww — fixed in dpcn54ww
• Lenovo Ideapad Creator 5-15Imh05 Firmware: before egcn36ww — fixed in egcn36ww
• Lenovo Ideapad Gaming 3-15Arh05 Firmware: before fccn17ww — fixed in fccn17ww
• Lenovo Ideapad Gaming 3-15Imh05 Firmware: before egcn36ww — fixed in egcn36ww

How to fix

Upgrade to a fixed version: Lenovo Ideapad 3-14Ada05 Firmware e8cn33ww; Lenovo Ideapad 3-14Ada6 Firmware hbcn21ww; Lenovo Ideapad 3-14Alc6 Firmware glcn43ww; Lenovo Ideapad 3-14Are05 Firmware dzcn42ww; Lenovo Ideapad 3-14Igl05 Firmware emcn52ww; Lenovo Ideapad 3-14Iil05 Firmware dvcn23ww; Lenovo Ideapad 3-14Iml05 Firmware dxcn41ww; Lenovo Ideapad 3-14Itl05 Firmware gccn26ww; Lenovo Ideapad 3-14Itl6 Firmware ggcn33ww; Lenovo Ideapad 3-15Ada05 Firmware e8cn33ww; Lenovo Ideapad 3-15Ada6 Firmware hbcn21ww; Lenovo Ideapad 3-15Alc6 Firmware glcn43ww. Check the vendor advisory for mitigations.

References

• https://support.lenovo.com/us/en/product_security/LEN-73440
• https://support.lenovo.com/us/en/product_security/LEN-73440

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