How severe is CVE-2021-33158?

CVE-2021-33158 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over local access with high attack complexity, requires high privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability high.

Is CVE-2021-33158 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (12th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-33158?

CVE-2021-33158 primarily affects Intel Ethernet Controller I225-it Firmware. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-33158?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2021-33158 have an EU (EUVD) identifier?

Yes. CVE-2021-33158 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2021-19873.

When was CVE-2021-33158 published?

CVE-2021-33158 was published on 2024-02-23 and last updated on 2026-06-17.

CVE-2021-33158

CVE-2021-33158 is a high-severity vulnerability in Intel Ethernet Controller I225-it Firmware with a CVSS 3.x base score of 7.2. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-86.

Key facts

Severity: High (CVSS 3.x base score 7.2)
EPSS exploit prediction: 0% (12th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2021-19873
Weakness: CWE-86
Affected product: Intel Ethernet Controller I225-it Firmware
Published: 2024-02-23
Last modified: 2026-06-17

Description

Improper neutralization in some Intel(R) Ethernet Adapters and Intel(R) Ethernet Controller I225 Manageability firmware may allow a privileged user to potentially enable escalation of privilege via local access.

Frequently asked questions

What is CVE-2021-33158?: Improper neutralization in some Intel(R) Ethernet Adapters and Intel(R) Ethernet Controller I225 Manageability firmware may allow a privileged user to potentially enable escalation of privilege via local access.
How severe is CVE-2021-33158?: CVE-2021-33158 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over local access with high attack complexity, requires high privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability high.
Is CVE-2021-33158 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (12th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-33158?: CVE-2021-33158 primarily affects Intel Ethernet Controller I225-it Firmware. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-33158?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2021-33158 have an EU (EUVD) identifier?: Yes. CVE-2021-33158 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2021-19873.
When was CVE-2021-33158 published?: CVE-2021-33158 was published on 2024-02-23 and last updated on 2026-06-17.

References

https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00756.html

Affected products (4)

cpe:2.3:o:intel:ethernet_controller_i225-it_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:intel:ethernet_controller_i225-lm_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:intel:ethernet_controller_i225-v_firmware:*:*:*:*:*:*:*:*
cpe:2.3:a:intel:ethernet_adapter_complete_driver:*:*:*:*:*:*:*:*

More vulnerabilities in Intel Ethernet Controller I225-it Firmware

CVE-2021-33141 — High (CVSS 8.6): Improper input validation in some Intel(R) Ethernet Adapters and Intel(R) Ethernet Controller I225 Manageability…
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