Authenticated device compromise via oversized cmdinput
Published Mar 12, 2026 · Updated Mar 12, 2026
Stack-based buffer overflow in Tenda W3 1.0.0.3(2204) allows remote authenticated users to compromise the device through an HTTP request. The formexeCommand handler for /goform/exeCommand copies an oversized cmdinput value into a fixed-size stack buffer without enforcing its bounds. A valid low-privilege session is required; successful exploitation can alter device execution, expose data, or interrupt service.
Summary
What happened
Stack-based buffer overflow in Tenda W3 1.0.0.3(2204) allows remote authenticated users to compromise the device through an HTTP request. The formexeCommand handler for /goform/exeCommand copies an oversized cmdinput value into a fixed-size stack buffer without enforcing its bounds. A valid low-privilege session is required; successful exploitation can alter device execution, expose data, or interrupt service.
The record
- CVE
- CVE-2026-3974
- Published
- Mar 12, 2026
- Updated
- Mar 12, 2026
- Vendor
- Shenzhen Tenda Technology Co., Ltd.
- Product
- W3
- Classifications
- CWE-121, CWE-787, CWE-119, T1190
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Mar 12, 2026CVE publishedPublication date reported by the CVE source.
- Mar 12, 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?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=1.0.0.3(2204)
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.
Weakness, pattern, technique
Public exploit references
- Tenda W3 formexeCommand cmdinput buffer-overflow proof of conceptproof 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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