How severe is CVE-2025-4276?

CVE-2025-4276 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over local access with high attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-4276 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (3rd percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2025-4276?

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-2025-4276 have an EU (EUVD) identifier?

Yes. CVE-2025-4276 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-24533.

When was CVE-2025-4276 published?

CVE-2025-4276 was published on 2025-08-13 and last updated on 2026-06-17.

CVE-2025-4276

CVE-2025-4276 is a high-severity vulnerability with a CVSS 3.x base score of 7.5. 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-20.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 0% (3rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-24533
Weakness: CWE-20
Published: 2025-08-13
Last modified: 2026-06-17

Description

UsbCoreDxe has a vulnerability which can be used to write arbitrary memory inside SMRAM and execute arbitrary code at SMM level.

Frequently asked questions

What is CVE-2025-4276?: UsbCoreDxe has a vulnerability which can be used to write arbitrary memory inside SMRAM and execute arbitrary code at SMM level.
How severe is CVE-2025-4276?: CVE-2025-4276 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over local access with high attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-4276 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (3rd percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2025-4276?: 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-2025-4276 have an EU (EUVD) identifier?: Yes. CVE-2025-4276 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-24533.
When was CVE-2025-4276 published?: CVE-2025-4276 was published on 2025-08-13 and last updated on 2026-06-17.

References

https://www.insyde.com/security-pledge/sa-2025005/

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