Unauthenticated router crash via unchecked device name copy
Published Jan 21, 2026 · Updated Jan 21, 2026
Stack-based buffer overflow in Tenda AX-1806 firmware 1.0.0.1 allows remote attackers to crash the router via a crafted HTTP request. The formSetWifiMacFilterCfg handler splits deviceList entries, then sub_38214 copies an attacker-controlled device name into 128 available stack bytes with strcpy and no length check. Network access to the management endpoint is sufficient; an overlong name overwrites stack control data and demonstrably stops router services.
Summary
What happened
Stack-based buffer overflow in Tenda AX-1806 firmware 1.0.0.1 allows remote attackers to crash the router via a crafted HTTP request. The formSetWifiMacFilterCfg handler splits deviceList entries, then sub_38214 copies an attacker-controlled device name into 128 available stack bytes with strcpy and no length check. Network access to the management endpoint is sufficient; an overlong name overwrites stack control data and demonstrably stops router services.
The record
- CVE
- CVE-2025-70645
- Published
- Jan 21, 2026
- Updated
- Jan 21, 2026
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-121, T1499.004
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jan 21, 2026CVE publishedPublication date reported by the CVE source.
- Jan 21, 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?
What conditions does exploitation require?
What is affected?
Affected products and versions are unavailable in this record.
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
- deviceList HTTP stack-overflow proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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