Use after free in Windows Cluster Client Failover allows an authorized attacker to elevate privileges locally.
Project Subscriptions
| Vendors | Products |
|---|---|
|
Microsoft
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Windows Server 2016
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Windows Server 2016 (server Core Installation)
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Windows Server 2019
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Windows Server 2019 (server Core Installation)
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Windows Server 2022
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Windows Server 2022, 23h2 Edition (server Core Installation)
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Windows Server 2022 23h2
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Windows Server 2025
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Windows Server 2025 (server Core Installation)
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Windows Server 23h2
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Advisories
No advisories yet.
Fixes
Solution
No solution given by the vendor.
Workaround
No workaround given by the vendor.
References
History
Thu, 12 Feb 2026 12:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Microsoft windows Server 2016 (server Core Installation)
Microsoft windows Server 2019 (server Core Installation) Microsoft windows Server 2022, 23h2 Edition (server Core Installation) Microsoft windows Server 2025 (server Core Installation) |
|
| Vendors & Products |
Microsoft windows Server 2016 (server Core Installation)
Microsoft windows Server 2019 (server Core Installation) Microsoft windows Server 2022, 23h2 Edition (server Core Installation) Microsoft windows Server 2025 (server Core Installation) |
Wed, 11 Feb 2026 19:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Microsoft windows Server 2022 23h2
|
|
| CPEs | cpe:2.3:o:microsoft:windows_server_2022_23h2:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Microsoft windows Server 2022 23h2
|
Tue, 10 Feb 2026 18:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | Use after free in Windows Cluster Client Failover allows an authorized attacker to elevate privileges locally. | |
| Title | Cluster Client Failover (CCF) Elevation of Privilege Vulnerability | |
| First Time appeared |
Microsoft
Microsoft windows Server 2016 Microsoft windows Server 2019 Microsoft windows Server 2022 Microsoft windows Server 2025 Microsoft windows Server 23h2 |
|
| Weaknesses | CWE-416 | |
| CPEs | cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:* cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:* cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:* cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:* cpe:2.3:o:microsoft:windows_server_23h2:*:*:*:*:*:*:*:* |
|
| Vendors & Products |
Microsoft
Microsoft windows Server 2016 Microsoft windows Server 2019 Microsoft windows Server 2022 Microsoft windows Server 2025 Microsoft windows Server 23h2 |
|
| References |
| |
| Metrics |
cvssV3_1
|
Projects
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Status: PUBLISHED
Assigner: microsoft
Published:
Updated: 2026-02-20T21:52:39.140Z
Reserved: 2025-12-11T21:02:05.736Z
Link: CVE-2026-21251
No data.
Status : Analyzed
Published: 2026-02-10T18:16:26.840
Modified: 2026-02-11T19:42:34.007
Link: CVE-2026-21251
No data.
OpenCVE Enrichment
Updated: 2026-02-12T12:22:52Z
Weaknesses