Skip to content
Noroxi
NVD / CVE Program· CNA lenovo

CVE-2021-3843: A potential vulnerability in the SMI function to access EEPROM in some ThinkPad models may allow an attacker with local access and elevated

Noroxi assessment

Priority: Monitor (action score 26/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.27% (FIRST EPSS).
  • 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 in the SMI function to access EEPROM in some ThinkPad models may allow an attacker with local access and elevated privileges to execute arbitrary code.

MediumCVSS 6.7 · v3.1—No exploit No fix recorded
Published
Nov 12, 2021
Updated
Jun 17, 2026
EPSS
0.2% · 20th percentile

Report tools

JSON

Action score

26

Monitor

Low priority for now.

CVSS
26 / 40 · 6.7 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

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
  • No public exploit code on record
  • No fixed version yet

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

Follow CVE-2021-3843

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

One daily email digest (06:00 UTC); connect a webhook for KEV listings and weaponized exploits instantly.

Your free account also gets you

Running WordPress? Scan your site free with WP Lens

  • Stack alerts: add the products and versions you run, get the new CVEs that affect them
  • Uptime monitoring: 1 site, instant email when it goes down
  • Add your domain: subdomains and takeover risk scanned every week (1 domain)
  • 10 scans an hour on the security tools (3 a day without an account), an API key and MCP
  • All your scans in one panel: findings, what changed in the last scan, a report per domain or per client (PDF, share link)
All free tools

Sign up with email · Have an account? Sign in

Free account, no card. Unfollow any time.

Don't want an account? Get "Exploited this week" by email every MondayDon't want an account? RSS feed for lenovo records

Running WordPress? Scan your site free with WP Lens

Is your version affected? Check it

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.

We use this product, ask for help

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
lenovothinkpad 11e 3rd gen firmware
lenovothinkpad 11e 3rd gen
lenovothinkpad 11e 4th gen i3 firmware
lenovothinkpad 11e 4th gen i3
lenovothinkpad 11e 4th gen i7 firmware
lenovothinkpad 11e 4th gen i7
lenovothinkpad 11e 4th gen i5 firmware
lenovothinkpad 11e 4th gen i5
lenovothinkpad 11e 4th gen celeron firmware
lenovothinkpad 11e 4th gen celeron
lenovothinkpad 11e yoga gen 6 firmware
lenovothinkpad 11e yoga gen 6

and 47 more

Affected versions

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

  • lenovo thinkpad 11e 3rd gen firmwareup to 1.29 inclusive
  • lenovo thinkpad 11e 3rd gen firmwareup to 1.22 inclusive
  • lenovo thinkpad 11e 4th gen celeron firmwareup to 1.27 inclusive
  • lenovo thinkpad 11e 4th gen i3 firmwareup to 1.22 inclusive
  • lenovo thinkpad 11e 4th gen i5 firmwareup to 1.22 inclusive
  • lenovo thinkpad 11e 4th gen i7 firmwareup to 1.22 inclusive
  • lenovo thinkpad 11e 5th gen firmwareup to 1.13 inclusive
  • lenovo thinkpad 11e yoga gen 6 firmwareup to 1.12 inclusive
  • lenovo thinkpad 13 gen 2 firmwareup to 1.29 inclusive
  • lenovo thinkpad l13 firmwareup to 1.31 inclusive
  • lenovo thinkpad l13 gen 2 firmwareup to 1.11 inclusive
  • lenovo thinkpad l13 gen 2 firmwareup to 1.08 inclusive
  • lenovo thinkpad l13 yoga firmwareup to 1.31 inclusive
  • lenovo thinkpad l13 yoga gen 2 firmwareup to 1.11 inclusive
  • lenovo thinkpad l13 yoga gen 2 firmwareup to 1.08 inclusive
  • lenovo thinkpad l14 firmwarebefore 1.20.1.17
  • lenovo thinkpad l14 gen 1 firmwarebefore 1.15
  • lenovo thinkpad l15 firmwarebefore 1.20.1.17
  • lenovo thinkpad l15 gen 1 firmwarebefore 1.15
  • lenovo thinkpad l380 firmwareup to 1.26 inclusive

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 ThinkPad BIOS

    • variousaffected

Same product

lenovo: all records

Other highest-scoring records for the same primary product.

  • CVE-2021-3718A denial of service vulnerability was reported in some ThinkPad models that could cause a system to crash when the Enhanced Biometrics setti
    18Monitor

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

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

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.

No dated events beyond publication.

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-20 · Improper Input Validation

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.

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