Code execution via Telephony Service heap overflow
Published Feb 11, 2025 · Updated Feb 26, 2026
Heap-based buffer overflow in Microsoft Windows Telephony Service allows remote attackers to execute code through a crafted request. Microsoft identifies a heap overwrite in the Telephony Service but has not published the affected routine or the malformed field that exceeds its allocation. Exploitation requires a user to send a request to an attacker-controlled server; successful exploitation runs code on the affected Windows system.
Summary
What happened
Heap-based buffer overflow in Microsoft Windows Telephony Service allows remote attackers to execute code through a crafted request. Microsoft identifies a heap overwrite in the Telephony Service but has not published the affected routine or the malformed field that exceeds its allocation. Exploitation requires a user to send a request to an attacker-controlled server; successful exploitation runs code on the affected Windows system.
The record
- CVE
- CVE-2025-21190
- Published
- Feb 11, 2025
- Updated
- Feb 26, 2026
- Vendor
- Microsoft
- Product
- Windows 10 Version 1507
- Classifications
- CWE-122, T1203
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Feb 11, 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=10.0.10240.0 <10.0.10240.20915
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.
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Technologies
Your stack
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Your stack
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