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NVD / CVE Program· CNA lenovo

CVE-2021-3972: A potential vulnerability by a driver used during manufacturing process on some consumer Lenovo Notebook devices' BIOS that was mistakenly n

Noroxi assessment

Priority: Monitor (action score 27/100)

  • Public proof-of-concept code exists (GitHub); there is no record of exploitation in the wild.
  • Probability of exploitation in the next 30 days: 2.8% (FIRST EPSS); higher than 86.7% of all records.
  • Someone with local access to the system can trigger it. Administrator privileges are required. No user action is required. No special conditions are required; it is repeatable.
  • According to the record, no fixed version is available yet.

Low priority for now. Update when a fix is released; follow the vendor's advisory.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

MediumCVSS 6.7 · v3.1—Proof of concept No fix recorded
Published
Apr 22, 2022
Updated
Jun 17, 2026
EPSS
2.8% · 86th percentile

Report tools

JSON

Action score

27

Monitor

Low priority for now.

CVSS
26 / 40 · 6.7 / 10
CISA KEV
0 / 30 · Not listed
EPSS
1 / 30 · 2.8%

CNA vs NVD score

NVD
6.7
CNA · lenovo
6.7
agree

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • Proof of concept exists, no weaponized module
  • No fixed version yet

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2021-3972

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
lenovoideapad 3-14ada05 firmware
lenovoideapad 3-14ada05
lenovoideapad 3-14ada6 firmware
lenovoideapad 3-14ada6
lenovoideapad 3-14alc6 firmware
lenovoideapad 3-14alc6
lenovoideapad 3-14are05 firmware
lenovoideapad 3-14are05
lenovoideapad 3-15ada6 firmware
lenovoideapad 3-15ada6
lenovoideapad 3-15alc6 firmware
lenovoideapad 3-15alc6

and 188 more

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • lenovo ideapad 3-14ada05 firmwarebefore e8cn33ww
  • lenovo ideapad 3-14ada6 firmwarebefore hbcn21ww
  • lenovo ideapad 3-14alc6 firmwarebefore glcn43ww
  • lenovo ideapad 3-14are05 firmwarebefore dzcn42ww
  • lenovo ideapad 3-14igl05 firmwarebefore emcn52ww
  • lenovo ideapad 3-14iil05 firmwarebefore dvcn23ww
  • lenovo ideapad 3-14iml05 firmwarebefore dxcn41ww
  • lenovo ideapad 3-14itl05 firmwarebefore gccn26ww
  • lenovo ideapad 3-14itl6 firmwarebefore ggcn33ww
  • lenovo ideapad 3-15ada05 firmwarebefore e8cn33ww
  • lenovo ideapad 3-15ada6 firmwarebefore hbcn21ww
  • lenovo ideapad 3-15alc6 firmwarebefore glcn43ww
  • lenovo ideapad 3-15are05 firmwarebefore dzcn42ww
  • lenovo ideapad 3-15igl05 firmwarebefore dvcn23ww
  • lenovo ideapad 3-15iil05 firmwarebefore emcn52ww
  • lenovo ideapad 3-15iml05 firmwarebefore dxcn41ww
  • lenovo ideapad 3-15itl05 firmwarebefore gccn26ww
  • lenovo ideapad 3-15itl6 firmwarebefore ggcn33ww
  • lenovo ideapad 3-17ada05 firmwarebefore e8cn33ww
  • lenovo ideapad 3-17ada6 firmwarebefore hbcn21ww

Versions reported by the vendor

Affected version ranges reported by the assigning authority (lenovo). Independent of NVD's CPE analysis and usually ahead of it.

  • Lenovo Notebook BIOS

    • variousaffected

Same product

lenovo: all records

Other highest-scoring records for the same primary product.

  • CVE-2021-3971A potential vulnerability by a driver used during older manufacturing processes on some consumer Lenovo Notebook devices that was mistakenly
    26Monitor
  • CVE-2021-3970A potential vulnerability in LenovoVariable SMI Handler due to insufficient validation in some Lenovo Notebook models BIOS may allow an atta
    26Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

Proof of concept available

A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.

Evidence

  • Proof-of-concept repository on GitHub ×1

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Proof-of-concept repository on GitHubstars:42022-04-21

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. First PoC-2 d
  2. Published
  3. TodayOct 30, 2026+1652 d

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • Administrator privileges are required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
High
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-489 · Active Debug Code

CVSS vector

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

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records