Service interruption via HTTP PUT length underflow
Published Feb 21, 2025 · Updated Feb 21, 2025
Integer underflow in Eclipse ThreadX NetX Duo before 6.4.2 allows remote authenticated users to exhaust file-system space via HTTP PUT. The _nx_web_http_server_put_process function subtracts a received packet's data length from an unsigned remaining Content-Length without first rejecting a larger value. A later data packet exceeding the declared remainder wraps the counter to a huge value, keeping writes active until file-system resources are exhausted and the HTTP service is interrupted.
Summary
What happened
Integer underflow in Eclipse ThreadX NetX Duo before 6.4.2 allows remote authenticated users to exhaust file-system space via HTTP PUT. The _nx_web_http_server_put_process function subtracts a received packet's data length from an unsigned remaining Content-Length without first rejecting a larger value. A later data packet exceeding the declared remainder wraps the counter to a huge value, keeping writes active until file-system resources are exhausted and the HTTP service is interrupted.
The record
- CVE
- CVE-2025-0727
- Published
- Feb 21, 2025
- Updated
- Feb 21, 2025
- Vendor
- The Eclipse Foundation
- Product
- Eclipse ThreadX
- Classifications
- CWE-191, T1499.004
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Feb 21, 2025CVE publishedPublication date reported by the CVE source.
- Feb 21, 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=0 <6.4.1
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
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Technologies
Your stack
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Your stack
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