Unauthenticated code execution via use-after-free
Published Apr 8, 2025 · Updated Aug 10, 2026
Use-after-free in Windows Remote Desktop Services on affected Windows Server builds allows remote attackers to execute code over a network. Microsoft has not disclosed the routine, object lifetime error, or request sequence that causes the service to access freed memory. Exploitation requires no credentials or user interaction but has high attack complexity; successful attacks execute code on the server.
Summary
What happened
Use-after-free in Windows Remote Desktop Services on affected Windows Server builds allows remote attackers to execute code over a network. Microsoft has not disclosed the routine, object lifetime error, or request sequence that causes the service to access freed memory. Exploitation requires no credentials or user interaction but has high attack complexity; successful attacks execute code on the server.
The record
- CVE
- CVE-2025-26671
- Published
- Apr 8, 2025
- Updated
- Aug 10, 2026
- Vendor
- Microsoft
- Product
- Windows Server 2019
- Classifications
- CWE-591, CWE-416, T1210
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Apr 8, 2025CVE publishedPublication date reported by the CVE source.
- Aug 10, 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 <10.0.17763.7136
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.
Weakness, pattern, technique
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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