How severe is CVE-2021-27066?

CVE-2021-27066 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2021-27066 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (85th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-27066?

CVE-2021-27066 affects Microsoft Windows Admin Center. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-27066?

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

When was CVE-2021-27066 published?

CVE-2021-27066 was published on 2021-03-11 and last updated on 2026-06-17.

CVE-2021-27066

CVE-2021-27066 is a medium-severity vulnerability in Microsoft Windows Admin Center with a CVSS 3.x base score of 4.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 3.x base score 4.3)
CVSS v2: 4.0
EPSS exploit prediction: 3% (85th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Microsoft Windows Admin Center
Published: 2021-03-11
Last modified: 2026-06-17

Description

Windows Admin Center Security Feature Bypass Vulnerability

Frequently asked questions

What is CVE-2021-27066?: Windows Admin Center Security Feature Bypass Vulnerability
How severe is CVE-2021-27066?: CVE-2021-27066 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2021-27066 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (85th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-27066?: CVE-2021-27066 affects Microsoft Windows Admin Center. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-27066?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-27066 published?: CVE-2021-27066 was published on 2021-03-11 and last updated on 2026-06-17.

References

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-27066

Affected products (1)

cpe:2.3:a:microsoft:windows_admin_center:-:*:*:*:*:*:*:*

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