Privilege escalation via Telephony Server use-after-free
Published Apr 9, 2024 · Updated May 3, 2025
Use-after-free in Microsoft Windows Telephony Server allows local users to elevate privileges through a freed service object. ClientRequest RPC handling frees a GOLD object through one client context, then reuses it through another after RequestMakeCall data reclaims the allocation. Low-privileged local access is sufficient to redirect a virtual callback and load attacker-controlled code without user interaction.
Summary
What happened
Use-after-free in Microsoft Windows Telephony Server allows local users to elevate privileges through a freed service object. ClientRequest RPC handling frees a GOLD object through one client context, then reuses it through another after RequestMakeCall data reclaims the allocation. Low-privileged local access is sufficient to redirect a virtual callback and load attacker-controlled code without user interaction.
The record
- CVE
- CVE-2024-26230
- Published
- Apr 9, 2024
- Updated
- May 3, 2025
- Vendor
- Microsoft
- Product
- Windows 10 Version 1507
- Classifications
- CWE-416, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Apr 9, 2024CVE publishedPublication date reported by the CVE source.
- May 3, 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 <10.0.10240.20596
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
- STAR Labs CVE-2024-26230 proof of conceptfunctional · 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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