NVD / CVE Program· CNA lenovo

CVE-2021-3519: A vulnerability was reported in some Lenovo Desktop models that could allow unauthorized access to the boot menu, when the "BIOS Password At

Noroxi assessment

Priority: Monitor (action score 27/100)

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: 0.23% (FIRST EPSS).
Physical access to the device is required. No account or password is 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 vulnerability was reported in some Lenovo Desktop models that could allow unauthorized access to the boot menu, when the "BIOS Password At Boot Device List" BIOS setting is Yes.

MediumCVSS 6.8 · v3.1—No exploit No fix recorded

Auth bypass

Published: Nov 12, 2021
Updated: Jun 17, 2026
EPSS: 0.2% · 14th percentile
CWE: CWE-287

Report tools

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Action score

Monitor

Low priority for now.

CVSS: 27 / 40 · 6.8 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.2%

CNA vs NVD score

NVD: 6.8
CNA · lenovo: 6.4; 0.4 point gap

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

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.

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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.

Vendor	Product	CPE
lenovo	ideacentre c5-14mb05 firmware	cpe:2.3:o:lenovo:ideacentre_c5-14mb05_firmware
lenovo	ideacentre c5-14mb05	cpe:2.3:h:lenovo:ideacentre_c5-14mb05
lenovo	ideacentre 3-07imb05 firmware	cpe:2.3:o:lenovo:ideacentre_3-07imb05_firmware
lenovo	ideacentre 3-07imb05	cpe:2.3:h:lenovo:ideacentre_3-07imb05
lenovo	ideacentre 5-14imb05 firmware	cpe:2.3:o:lenovo:ideacentre_5-14imb05_firmware
lenovo	ideacentre 5-14imb05	cpe:2.3:h:lenovo:ideacentre_5-14imb05
lenovo	ideacentre 5-14iob6 firmware	cpe:2.3:o:lenovo:ideacentre_5-14iob6_firmware
lenovo	ideacentre 5-14iob6	cpe:2.3:h:lenovo:ideacentre_5-14iob6
lenovo	ideacentre creator 5-14iob6 firmware	cpe:2.3:o:lenovo:ideacentre_creator_5-14iob6_firmware
lenovo	ideacentre creator 5-14iob6	cpe:2.3:h:lenovo:ideacentre_creator_5-14iob6
lenovo	ideacentre g5-14imb05 firmware	cpe:2.3:o:lenovo:ideacentre_g5-14imb05_firmware
lenovo	ideacentre g5-14imb05	cpe:2.3:h:lenovo:ideacentre_g5-14imb05

and 107 more

Affected versions

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

lenovo ideacentre 3-07imb05 firmwarebefore m2vkt18a
lenovo ideacentre 310s-08igm firmwareup to m1tkt31a inclusive
lenovo ideacentre 5-14imb05 firmwarebefore o4hkt33a
lenovo ideacentre 5-14iob6 firmwarebefore m3gkt29a
lenovo ideacentre 510a-15arr firmwareup to o4dkt41a inclusive
lenovo ideacentre 510s-07icb firmwarebefore m22kt46a
lenovo ideacentre 510s-07ick firmwarebefore m30kt24a
lenovo ideacentre 510s-07ick firmwarebefore m30kt23a
lenovo ideacentre c5-14mb05 firmwarebefore o4hkt33a
lenovo ideacentre creator 5-14iob6 firmwarebefore m3gkt29a
lenovo ideacentre g5-14imb05 firmwarebefore o4hkt33a
lenovo ideacentre gaming 5-14iob6 firmwarebefore m3gkt29a
lenovo thinkcentre e75 t/s firmwarebefore m16kt67a
lenovo thinkcentre m60e tiny firmwarebefore m3skt1ea
lenovo thinkcentre m630e firmwarebefore m28kt36a
lenovo thinkcentre m70a firmwareup to m2skt21a inclusive
lenovo thinkcentre m70a gen 2 firmwarebefore m3nkt17a
lenovo thinkcentre m70c firmwarebefore m2vkt18a
lenovo thinkcentre m70q firmwarebefore m2wkt49a
lenovo thinkcentre m70s firmwarebefore m2tkt3ca

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 Desktop BIOS
- variousaffected

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.

Pawel Urbanek

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

Physical access to the device is required.
No account or password is 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: Physical
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality impact: High
Integrity impact: High
Availability impact: High

Weakness class (CWE)

CWE-287 · Improper Authentication

CVSS vector

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

nvd-primary

Root cause

Authentication is added route by route instead of being enforced in one place. When a route added later bypasses the shared middleware, the session check never runs for it.

The bug in code

The whole CWE-287 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1app.use("/admin", requireSession, adminRouter);
2

3// Route added later skips the middleware
4app.post("/admin-api/config", updateConfig);

Fixed

1const admin = express.Router();
2admin.use(requireSession, requireRole("admin"));
3

4admin.post("/config", updateConfig);
5app.use("/admin", admin);

Attack context

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

Attack patterns (CAPEC)

ATT&CK techniques

Change log

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

References

support.lenovo.com/us/en/product_security/LEN-67440

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

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