Local privilege escalation via improper input validation
Published Apr 8, 2025 · Updated Aug 10, 2026
Improper input validation in Windows Mobile Broadband on affected Windows 11 and Windows Server builds allows local users to elevate privileges. Microsoft identifies heap-based buffer overflow and out-of-bounds read conditions but has not disclosed the malformed input, driver routine, or failed validation. A low-privileged local account is required, and successful exploitation grants elevated control over the affected system.
Summary
What happened
Improper input validation in Windows Mobile Broadband on affected Windows 11 and Windows Server builds allows local users to elevate privileges. Microsoft identifies heap-based buffer overflow and out-of-bounds read conditions but has not disclosed the malformed input, driver routine, or failed validation. A low-privileged local account is required, and successful exploitation grants elevated control over the affected system.
The record
- CVE
- CVE-2025-29811
- Published
- Apr 8, 2025
- Updated
- Aug 10, 2026
- Vendor
- Microsoft
- Product
- Windows Server 2025 (Server Core installation)
- Classifications
- CWE-122, CWE-20, CWE-125, T1068
- Attack vector
- local
- Privileges
- authenticated
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=10.0.26100.0 <10.0.26100.3775
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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