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CVE-2021-33767

26
FAUCET Score

CVE-2021-33767 is an Elevation of Privilege vulnerability affecting the Microsoft Open Enclave SDK. With a CVSS score of 8.2 (HIGH), this vulnerability allows a high-privileged local attacker to achieve significant impact on confidentiality, integrity, and availability of the system. While no public exploit code or active exploitation has been observed, its inclusion in Microsoft's July 2021 Patch Tuesday and limited media coverage indicate its significance.

Impacted Technologies

VendorProductVersion(s)CPE
>= 0.1.1, < 0.17.1CPE match
cpe:2.3:a:microsoft:open_enclave_sdk:*:*:*:*:*:*:*:*
< 0.17.1CPE matchmatch criteria
cpe:2.3:a:microsoft:open_enclave_software_development_kit:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.2HIGH

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
1.5
Impact Score
6.0
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.79%
Probability of exploitation in next 30 days
EPSS Percentile
52.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0079 is in the 93rd percentile among its peer group of 358 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

microsoftpatch availablevia nvd_reference
View patch
microsoftpatch availablevia msrc
Product: Open Enclave SDKFixed in: 0.17.1
View patch

Vendor Advisories (1)

microsoft2021-Jul/CVE-2021-33767Important

Open Enclave SDK Elevation of Privilege Vulnerability

Jul 13, 2021

References

portal.msrc.microsoft.com / en-US/security-guidance/advisory/CVE-2021-33767
PatchVendor Advisory