Service interruption via HTTP PUT integer underflow
Published Apr 2, 2025 · Updated Nov 3, 2025
Integer underflow in NetX Duo HTTP PUT handling in affected X-CUBE Azure RTOS packages allows remote authenticated users to exhaust storage. The _nx_web_http_server_put_process function subtracts in-packet body bytes from an unsigned Content-Length without rejecting a body larger than the declared length, wrapping the remainder to 0xffffffff. Access to the HTTP server's PUT operation is required; continued data transmission makes the server write until filesystem resources are consumed, interrupting service.
Summary
What happened
Integer underflow in NetX Duo HTTP PUT handling in affected X-CUBE Azure RTOS packages allows remote authenticated users to exhaust storage. The _nx_web_http_server_put_process function subtracts in-packet body bytes from an unsigned Content-Length without rejecting a body larger than the declared length, wrapping the remainder to 0xffffffff. Access to the HTTP server's PUT operation is required; continued data transmission makes the server write until filesystem resources are consumed, interrupting service.
The record
- CVE
- CVE-2024-50596
- Published
- Apr 2, 2025
- Updated
- Nov 3, 2025
- Vendor
- STMicroelectronics
- Product
- X-CUBE-AZRTOS-G4
- Classifications
- CWE-191, T1499.004
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Apr 2, 2025CVE publishedPublication date reported by the CVE source.
- Nov 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?
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- Affected versionversion=2.0.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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