Remote code execution via service heap overflow
Published Apr 8, 2025 · Updated Aug 10, 2026
Heap-based buffer overflow in Microsoft Windows Telephony Service allows remote attackers to execute code through network input. The service mishandles network input in a heap allocation, but Microsoft has not disclosed the affected parsing routine or field. Exploitation requires user interaction but no prior privileges and grants code execution in the service's security context.
Summary
What happened
Heap-based buffer overflow in Microsoft Windows Telephony Service allows remote attackers to execute code through network input. The service mishandles network input in a heap allocation, but Microsoft has not disclosed the affected parsing routine or field. Exploitation requires user interaction but no prior privileges and grants code execution in the service's security context.
The record
- CVE
- CVE-2025-27477
- Published
- Apr 8, 2025
- Updated
- Aug 10, 2026
- Vendor
- Microsoft
- Product
- Windows 10 Version 1507
- Classifications
- CWE-787, CWE-122, 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=10.0.10240.0 <10.0.10240.20978
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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