How severe is CVE-2026-20825?

CVE-2026-20825 has a CVSS 3.x base score of 4.4, rated medium severity. It is exploitable over local access with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2026-20825 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (40th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-20825?

CVE-2026-20825 primarily affects Microsoft Windows 10 1809. In total, 10 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-20825?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-20825 have an EU (EUVD) identifier?

Yes. CVE-2026-20825 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-2203.

When was CVE-2026-20825 published?

CVE-2026-20825 was published on 2026-01-13 and last updated on 2026-06-17.

CVE-2026-20825

CVE-2026-20825 is a medium-severity vulnerability in Microsoft Windows 10 1809 with a CVSS 3.x base score of 4.4. 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-284.

Key facts

Severity: Medium (CVSS 3.x base score 4.4)
EPSS exploit prediction: 1% (40th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-2203
Weakness: CWE-284
Affected product: Microsoft Windows 10 1809
Published: 2026-01-13
Last modified: 2026-06-17

Description

Improper access control in Windows Hyper-V allows an authorized attacker to disclose information locally.

Frequently asked questions

What is CVE-2026-20825?: Improper access control in Windows Hyper-V allows an authorized attacker to disclose information locally.
How severe is CVE-2026-20825?: CVE-2026-20825 has a CVSS 3.x base score of 4.4, rated medium severity. It is exploitable over local access with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2026-20825 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (40th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-20825?: CVE-2026-20825 primarily affects Microsoft Windows 10 1809. In total, 10 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-20825?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-20825 have an EU (EUVD) identifier?: Yes. CVE-2026-20825 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-2203.
When was CVE-2026-20825 published?: CVE-2026-20825 was published on 2026-01-13 and last updated on 2026-06-17.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20825

Affected products (10)

cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2022_23h2:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*

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