Tenda G0
CVE-2026-36798
MEDIUM
Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Debug configuration endpoint warrants at least low-privilege access on a router; direct HTTP POST exploitation needs no user interaction, making UI:N more accurate.
Primary rating from NVD.
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Lifecycle Timeline
3DescriptionNVD
Shenzhen Tenda Technology Co., Ltd Tenda G0 v15.11.0.5 was discovered to contain multiple stack overflows in the formSetDebugCfgr function via the enable, level, and module parameters. These vulnerabilities allow attackers to cause a Denial of Service (DoS) via a crafted HTTP request.
AnalysisAI
Multiple stack-based buffer overflows in Tenda G0 router firmware v15.11.0.5 allow network-adjacent or remote attackers to crash the device by sending crafted HTTP requests to the formSetDebugCfgr debug configuration endpoint, with three independent overflow vectors (enable, level, module parameters) each capable of triggering a denial-of-service condition. The official CVSS vector includes UI:R, suggesting a possible CSRF-style delivery mechanism requiring an authenticated administrator to be tricked into issuing the malicious request, which meaningfully constrains exploitation compared to a purely unauthenticated remote attack. No public exploit confirmed in CISA KEV; an associated GitHub repository referenced in the CVE may contain proof-of-concept material, though EPSS remains extremely low at 0.01% (2nd percentile).
Technical ContextAI
The vulnerability resides in the formSetDebugCfgr CGI function within the web-based management interface of Tenda G0 router firmware v15.11.0.5, produced by Shenzhen Tenda Technology Co., Ltd. The root cause class is CWE-121 (Stack-based Buffer Overflow): HTTP request parameters - enable, level, and module - are copied into fixed-size stack-allocated buffers without length validation, allowing an attacker to overwrite adjacent stack memory including saved return addresses or frame pointers. Three separate parameters each represent an independently exploitable overflow, increasing the attack surface within the same function. The affected firmware is typical of SOHO router implementations where CGI handlers directly parse HTTP form data with minimal input sanitization. The NVD-supplied CPE (cpe:2.3:a:n/a:n/a) is a generic placeholder and does not independently enumerate the product; affected product scope is derived entirely from the CVE description.
RemediationAI
No vendor-released patch has been identified at the time of analysis, and no official Tenda security advisory is available in the referenced data. Administrators should monitor Tenda's official firmware download portal for G0 firmware updates beyond v15.11.0.5 and apply any available update promptly. As an immediate compensating control, disable remote (WAN-side) access to the router's HTTP management interface - this eliminates the network attack vector for externally sourced exploitation and is the highest-impact single mitigation available. On the LAN side, restrict access to the management interface to specific trusted host IP addresses using any available ACL or firewall rule to reduce CSRF-based exploitation risk from compromised LAN clients. If the router supports disabling or restricting the debug configuration interface specifically, that endpoint should be disabled, as it is not required for normal router operation. Note that restricting management interface access may complicate remote administration and should be paired with documented out-of-band console access procedures.
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Same weakness CWE-121 – Stack-based Buffer Overflow
View allSame technique Stack Overflow
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External POC / Exploit Code
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