Service interruption via unbounded username copy
Published Jun 9, 2026 · Updated Jun 9, 2026
Stack-based buffer overflow in Tenda W3 1.0.0.3(2204) allows attackers to crash or reboot the router via a crafted HTTP request. R7WebsSecurityHandler reads the username and password with websGetVar and copies the username into a fixed stack buffer through unbounded strcpy without validating its length. Both parameters must be present, and the disclosed path proceeds through credential checks before an oversized username corrupts adjacent stack memory and interrupts routing service.
Summary
What happened
Stack-based buffer overflow in Tenda W3 1.0.0.3(2204) allows attackers to crash or reboot the router via a crafted HTTP request. R7WebsSecurityHandler reads the username and password with websGetVar and copies the username into a fixed stack buffer through unbounded strcpy without validating its length. Both parameters must be present, and the disclosed path proceeds through credential checks before an oversized username corrupts adjacent stack memory and interrupts routing service.
The record
- CVE
- CVE-2026-36794
- Published
- Jun 9, 2026
- Updated
- Jun 9, 2026
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-121, T1499.004
- Attack vector
- network
- Privileges
- Unavailable
Timeline
How it unfolded
- Jun 9, 2026CVE publishedPublication date reported by the CVE source.
- Jun 9, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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What is affected?
Affected products and versions are unavailable in this record.
Published CVSS scores
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Attacks
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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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