Local privilege escalation via undisclosed heap overflow
Published Oct 14, 2025 · Updated Oct 14, 2025
Heap-based buffer overflow in Microsoft Azure Local allows local users to elevate privileges on affected Windows Server hosts. Microsoft has not disclosed the vulnerable component or the operation that overruns a heap allocation with attacker-controlled data. Exploitation requires existing low-privilege local access and grants higher privileges, with confidentiality, integrity, and availability impact on the host.
Summary
What happened
Heap-based buffer overflow in Microsoft Azure Local allows local users to elevate privileges on affected Windows Server hosts. Microsoft has not disclosed the vulnerable component or the operation that overruns a heap allocation with attacker-controlled data. Exploitation requires existing low-privilege local access and grants higher privileges, with confidentiality, integrity, and availability impact on the host.
The record
- CVE
- CVE-2025-55697
- Published
- Oct 14, 2025
- Updated
- Oct 14, 2025
- Vendor
- Microsoft
- Product
- Windows Server 2025 (Server Core installation)
- Classifications
- CWE-122, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Oct 14, 2025CVE publishedPublication date reported by the CVE source.
- Oct 14, 2025Record 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 <10.0.26100.6899
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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