NVD / CVE Program· CNA intel

CVE-2021-0091: Improper access control in the firmware for some Intel(R) Processors may allow an unauthenticated user to potentially enable an escalation o

Noroxi assessment

Priority: Monitor (action score 31/100)

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: 0.32% (FIRST EPSS).
Someone with local access to the system can trigger it. A low-privileged account is enough. 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

Improper access control in the firmware for some Intel(R) Processors may allow an unauthenticated user to potentially enable an escalation of privilege via local access.

HighCVSS 7.8 · v3.1—No exploit No fix recorded

Local privilege escalation

Published: Feb 9, 2022
Updated: Jun 16, 2026
EPSS: 0.3% · 24th percentile
CWE: —

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Action score

Monitor

Low priority for now.

CVSS: 31 / 40 · 7.8 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.3%

CISA SSVC decision

Exploitation: none
Automatable: no
Technical impact: total

Vulnrichment: CISA's decision-tree inputs.

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
intel	atom c3308	cpe:2.3:h:intel:atom_c3308
intel	atom c3336	cpe:2.3:h:intel:atom_c3336
intel	atom c3338	cpe:2.3:h:intel:atom_c3338
intel	atom c3338r	cpe:2.3:h:intel:atom_c3338r
intel	atom c3436l	cpe:2.3:h:intel:atom_c3436l
intel	atom c3508	cpe:2.3:h:intel:atom_c3508
intel	atom c3538	cpe:2.3:h:intel:atom_c3538
intel	atom c3558	cpe:2.3:h:intel:atom_c3558
intel	atom c3558r	cpe:2.3:h:intel:atom_c3558r
intel	atom c3708	cpe:2.3:h:intel:atom_c3708
intel	atom c3750	cpe:2.3:h:intel:atom_c3750
intel	atom c3758	cpe:2.3:h:intel:atom_c3758

and 188 more

Affected versions

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

intel atom c3308all versions
intel atom c3336all versions
intel atom c3338all versions
intel atom c3338rall versions
intel atom c3436lall versions
intel atom c3508all versions
intel atom c3538all versions
intel atom c3558all versions
intel atom c3558rall versions
intel atom c3708all versions
intel atom c3750all versions
intel atom c3758all versions
intel atom c3758rall versions
intel atom c3808all versions
intel atom c3830all versions
intel atom c3850all versions
intel atom c3858all versions
intel atom c3950all versions
intel atom c3955all versions
intel atom c3958all versions

Versions reported by the vendor

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

n/a Intel(R) Processors
- See referencesaffected

Same product

intel: all records

Other highest-scoring records for the same primary product.

CVE-2021-0099Insufficient control flow management in the firmware for some Intel(R) Processors may allow an authenticated user to potentially enable an e
31Monitor
CVE-2022-0002Non-transparent sharing of branch predictor within a context in some Intel(R) Processors may allow an authorized user to potentially enable
26Monitor
CVE-2021-0115Buffer overflow in the firmware for some Intel(R) Processors may allow a privileged user to potentially enable escalation of privilege via l
26Monitor

Published before and after this one in the same product

← EarlierCVE-2020-24513Jun 9, 2021 · Domain-bypass transient execution vulnerability in some Intel Atom(R) Processors may allow an authenticated user to potentially enable infor
26Monitor
Later →CVE-2021-0092Feb 9, 2022 · Improper access control in the firmware for some Intel(R) Processors may allow a privileged user to potentially enable a denial of service v
17Monitor
Later →CVE-2021-0093Feb 9, 2022 · Incorrect default permissions in the firmware for some Intel(R) Processors may allow a privileged user to potentially enable a denial of ser
17Monitor

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.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

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.

No credits in the CNA record.

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

Intel® Vulnerability Disclosure Program Intigriti · disclosure only (VDP)

The product’s vendor appears in a public program. Matched by name; verify the scope text in the program.

Technical details

Attack conditions

Someone with local access to the system can trigger it.
A low-privileged account is enough.
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: Low
User interaction: None
Scope: Unchanged
Confidentiality impact: High
Integrity impact: High
Availability impact: High

Weakness class (CWE)

—

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/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.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

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

References

security.netapp.com/advisory/ntap-20220210-0007/

Show all references (1 more)

www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00527.html

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

All records