SYSTEM privilege escalation via unterminated registry value
Published Nov 12, 2024 · Updated Jul 8, 2025
Heap-based buffer overflow in Microsoft Windows Telephony Service allows local users to execute code as SYSTEM through a registry value. GetPriorityList reads the user-controlled RequestMakeCall value into a heap buffer and passes it to _wcsupr without ensuring null termination, causing reads and writes beyond the allocation. Low-privileged local access is required; successful exploitation yields SYSTEM privileges.
Summary
What happened
Heap-based buffer overflow in Microsoft Windows Telephony Service allows local users to execute code as SYSTEM through a registry value. GetPriorityList reads the user-controlled RequestMakeCall value into a heap buffer and passes it to _wcsupr without ensuring null termination, causing reads and writes beyond the allocation. Low-privileged local access is required; successful exploitation yields SYSTEM privileges.
The record
- CVE
- CVE-2024-43626
- Published
- Nov 12, 2024
- Updated
- Jul 8, 2025
- Vendor
- Microsoft
- Product
- Windows 10 Version 1507
- Classifications
- CWE-122, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Nov 12, 2024CVE publishedPublication date reported by the CVE source.
- Jul 8, 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=10.0.10240.0 <10.0.10240.20826
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
- STAR Labs heap-pointer leak demonstrationproof of concept · demonstrated
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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