Known Exploited Vulnerability

CVE-2023-28229

Microsoft Windows CNG Key Isolation Service Privilege Escalation Vulnerability

Past federal due date 15 public exploits Added 04 Oct 2023 Due 25 Oct 2023 · 1017 days ago

VendorMicrosoft

ProductWindows CNG Key Isolation Service

WeaknessCWE-591

RansomwareNone confirmed

What the flaw is

Microsoft Windows Cryptographic Next Generation (CNG) Key Isolation Service contains an unspecified vulnerability that allows an attacker to gain specific limited SYSTEM privileges.

Description as published by CISA. We have not independently reproduced it.

What CISA requires

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

This deadline is binding on US federal civilian agencies under BOD 22-01. It is not a legal deadline for anyone else, but it is a useful urgency signal — CISA sets it by how actively the flaw is being used, not by CVSS.

Public exploit code

15 public repositories referencing this CVE have been catalogued on GitHub. Treat this as a strong signal to prioritise patching, not as a verified working exploit — many such repositories are scanners, write-ups or forks rather than functional code.

Showing 8 of 15. Full list in the trickest/cve dataset.

Vendor advisories

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Other Microsoft entries

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CVE-2026-50522

Source: CISA KEV catalog · last verified August 6, 2026. Rebuilt automatically twice a day.