How severe is CVE-2021-33767?

CVE-2021-33767 has a CVSS 3.x base score of 8.2, rated high severity. It is exploitable over local access with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-33767 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (52nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-33767?

CVE-2021-33767 affects Microsoft Open Enclave Software Development Kit. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-33767?

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.

When was CVE-2021-33767 published?

CVE-2021-33767 was published on 2021-07-14 and last updated on 2026-06-17.

CVE-2021-33767

CVE-2021-33767 is a high-severity vulnerability in Microsoft Open Enclave Software Development Kit with a CVSS 3.x base score of 8.2. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 3.x base score 8.2)
CVSS v2: 4.6
EPSS exploit prediction: 1% (52nd percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Microsoft Open Enclave Software Development Kit
Published: 2021-07-14
Last modified: 2026-06-17

Description

Open Enclave SDK Elevation of Privilege Vulnerability

Frequently asked questions

What is CVE-2021-33767?: Open Enclave SDK Elevation of Privilege Vulnerability
How severe is CVE-2021-33767?: CVE-2021-33767 has a CVSS 3.x base score of 8.2, rated high severity. It is exploitable over local access with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-33767 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (52nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-33767?: CVE-2021-33767 affects Microsoft Open Enclave Software Development Kit. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-33767?: 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.
When was CVE-2021-33767 published?: CVE-2021-33767 was published on 2021-07-14 and last updated on 2026-06-17.

References

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-33767

Affected products (1)

cpe:2.3:a:microsoft:open_enclave_software_development_kit:*:*:*:*:*:*:*:*

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