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Microsoft · Windows CNG Key Isolation Service

CVE-2023-28229

Microsoft Windows CNG Key Isolation Service Privilege Escalation Vulnerability

CISA KEV record

CISA date added
2023-10-04
CISA due date
2023-10-25
Known ransomware use
Unknown

NVD risk context

7.0 HIGH

CVSS is a technical severity score. CISA’s KEV status remains the evidence that this vulnerability is known to be exploited.

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Attack vector
Local
An attacker needs local access to the affected system.
Attack complexity
High
Exploitation depends on conditions outside the attacker’s direct control.
Privileges required
Low
The attacker needs limited privileges before exploiting the issue.
User interaction
None
No action by another user is required.

Description

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

Required action

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

NVD reference index

Vendor and remediation references

NVD has tagged these sources as vendor advisories, patches, mitigations, or release notes.

Other NVD references (1)

MITRE CWE context

CWE classification

CWE-591 Sensitive Data Storage in Improperly Locked Memory

The product stores sensitive data in memory that is not locked, or that has been incorrectly locked, which might cause the memory to be written to swap files on disk by the virtual memory manager. This can make the data more accessible to external actors.

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NVD record timing

NVD record timeline

These dates describe NVD’s record, not CISA’s KEV addition or remediation due date.

NVD published
Apr 11, 2023, 09:15 PM UTC
When NVD first published this CVE record.
NVD last updated
Jun 17, 2026, 05:47 AM UTC
When NVD last changed its analysis or record data.
Advanced: view the technical CVSS vector

This standardized code is intended for security tools and technical analysts. The plain-language risk summary above explains its main points.

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

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CISA notes

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-28229; https://nvd.nist.gov/vuln/detail/CVE-2023-28229