Authenticated memory corruption via oversized MAC-filter parameters
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 corrupt process memory via crafted POST data. The formWifiMacFilterSet handler stores oversized index or GO values from /goform/WifiMacFilterSet in a fixed-size stack buffer without enforcing its bounds. Low-privilege management access is required; the record establishes stack memory corruption but does not document whether exploitation causes a crash or code execution.
Summary
What happened
Stack-based buffer overflow in Tenda W3 1.0.0.3(2204) allows remote authenticated users to corrupt process memory via crafted POST data. The formWifiMacFilterSet handler stores oversized index or GO values from /goform/WifiMacFilterSet in a fixed-size stack buffer without enforcing its bounds. Low-privilege management access is required; the record establishes stack memory corruption but does not document whether exploitation causes a crash or code execution.
The record
- CVE
- CVE-2026-3976
- Published
- Mar 12, 2026
- Updated
- Mar 12, 2026
- Vendor
- Shenzhen Tenda Technology Co., Ltd.
- Product
- W3
- Classifications
- CWE-119, CWE-787, CWE-121, T1210
- 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 formWifiMacFilterSet GO Buffer Overflow PoCproof of concept · unverified
- Tenda W3 formWifiMacFilterSet index Buffer Overflow PoCproof of concept · unverified
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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