Unauthenticated code execution via use-after-free
Published Jun 10, 2025 · Updated Feb 26, 2026
Use-after-free in Microsoft Windows KDC Proxy Service on Windows Server allows remote attackers to execute code over a network. Microsoft identifies KPSSVC as the affected locus but has not disclosed the routine, freed object, or request field that triggers reuse. Exploitation requires no authentication or user interaction, but it has high attack complexity and requires the network-facing proxy path to be reachable.
Summary
What happened
Use-after-free in Microsoft Windows KDC Proxy Service on Windows Server allows remote attackers to execute code over a network. Microsoft identifies KPSSVC as the affected locus but has not disclosed the routine, freed object, or request field that triggers reuse. Exploitation requires no authentication or user interaction, but it has high attack complexity and requires the network-facing proxy path to be reachable.
The record
- CVE
- CVE-2025-33071
- Published
- Jun 10, 2025
- Updated
- Feb 26, 2026
- Vendor
- Microsoft
- Product
- Windows Server 2019
- Classifications
- CWE-416, T1210
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 10, 2025CVE publishedPublication date reported by the CVE source.
- Feb 26, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=10.0.17763.0 <10.0.17763.7434
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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