Client crash via unsynchronized callback access
Published Feb 9, 2026 · Updated Feb 9, 2026
Use-after-free in FreeRDP before 3.22.0 allows remote attackers controlling an RDP server to crash a connected client. The ainput_send_input_event function reads channel_callback without locking, while a concurrent AINPUT channel close frees that callback before its channel Write method is called. Exploitation requires a client connection to a malicious server and a close-versus-input race; the demonstrated result is a client crash, while code execution depends on allocator state.
Summary
What happened
Use-after-free in FreeRDP before 3.22.0 allows remote attackers controlling an RDP server to crash a connected client. The ainput_send_input_event function reads channel_callback without locking, while a concurrent AINPUT channel close frees that callback before its channel Write method is called. Exploitation requires a client connection to a malicious server and a close-versus-input race; the demonstrated result is a client crash, while code execution depends on allocator state.
The record
- CVE
- CVE-2026-24683
- Published
- Feb 9, 2026
- Updated
- Feb 9, 2026
- Vendor
- FreeRDP
- Product
- FreeRDP
- Classifications
- CWE-416, T1203
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Feb 9, 2026CVE publishedPublication date reported by the CVE source.
- Feb 9, 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?
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- Affected versionversion=< 3.22.0
What conditions does exploitation require?
What is affected?
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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