How severe is CVE-2025-20109?

CVE-2025-20109 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-20109 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-2025-20109?

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-2025-20109 have an EU (EUVD) identifier?

Yes. CVE-2025-20109 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-24431.

When was CVE-2025-20109 published?

CVE-2025-20109 was published on 2025-08-12 and last updated on 2026-06-17.

CVE-2025-20109

CVE-2025-20109 is a high-severity vulnerability with a CVSS 3.x base score of 7.8. 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-653.

Key facts

Severity: High (CVSS 3.x base score 7.8)
CVSS v4: 7.3
EPSS exploit prediction: 0% (3rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-24431
Weakness: CWE-653
Published: 2025-08-12
Last modified: 2026-06-17

Description

Improper Isolation or Compartmentalization in the stream cache mechanism for some Intel(R) Processors may allow an authenticated user to potentially enable escalation of privilege via local access.

Frequently asked questions

What is CVE-2025-20109?: Improper Isolation or Compartmentalization in the stream cache mechanism for some Intel(R) Processors may allow an authenticated user to potentially enable escalation of privilege via local access.
How severe is CVE-2025-20109?: CVE-2025-20109 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-20109 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-2025-20109?: 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-2025-20109 have an EU (EUVD) identifier?: Yes. CVE-2025-20109 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-24431.
When was CVE-2025-20109 published?: CVE-2025-20109 was published on 2025-08-12 and last updated on 2026-06-17.

References

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