Tenda G0
CVE-2026-36797
HIGH
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain
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AccessIdentify Tenda G0 web UI on LAN/WAN
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DeliveryCraft HTTP request with oversized IPMacBindRuleIp
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ExploitPOST to /goform/formIPMacBindModify
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ExecutionOverflow stack buffer in handler
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PersistCrash httpd / reboot device
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ImpactRepeat to sustain denial of service
Vulnerability Assessment
| Weakness |
CWE
ASVS 5.0
V15 - Secure Coding and Architecture Buffer copy size validation
MITRE ATT&CK
1 technique across 1 tactic: Execution The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Exploitation Conditions | Exploitation requires network reachability to the Tenda G0's HTTP management interface (default LAN-side on port 80; WAN-side only if the operator has enabled 'Remote Web Management'), the device running firmware v15.11.0.5, and the ability to send a single crafted HTTP request to the formIPMacBindModify form handler with an oversized IPMacBindRuleIp parameter. No authentication is indicated by CVSS PR:N and no user interaction is required (UI:N). Limiting factors: the management UI is not exposed to the internet by default, the impact is confined to availability (device crash/reboot loop) with no confirmed code execution, and the vulnerability is specific to the G0 model on the named firmware build rather than the entire Tenda product line. |
| Impact | CVSS 3.1 rates the issue 7.5 (High) with vector AV:N/AC:L/PR:N/UI:N reflecting network reachability and no authentication, but impact is constrained to availability only (C:N/I:N/A:H) - there is no evidence the overflow yields code execution, only a crash. EPSS is 0.01% (percentile 2%) and SSVC Exploitation is 'none', indicating no observed or public exploit; however, SSVC also flags the attack as Automatable=yes with Technical Impact=partial, meaning a crash-loop attacker could reliably script the DoS. The bigger uncertainty is the deployment model: the Tenda G0 web UI is normally reachable only from the LAN by default, so the practical attack surface depends on whether remote/WAN management is enabled - the CVSS AV:N rating does not distinguish this. There is also no vendor advisory referenced and CPE data is malformed ('cpe:2.3:a:n/a:n/a:*'), which weakens version coverage confidence. |
| Exploit ScenarioDerived | An attacker on the same LAN - or on the internet if remote web management is enabled - sends a single crafted HTTP POST to the router's /goform/formIPMacBindModify endpoint with an oversized IPMacBindRuleIp value, overflowing a stack buffer in the management daemon and causing it to crash. The router's web UI and dependent services become unavailable until the device is rebooted, and the request can be scripted to repeat after each reboot to keep the device offline. Research-grade analysis material exists in a public GitHub repository, but no weaponized exploit was identified. |
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Alert meAnalysisAIv1 – Jun 10, 2026
Denial of service in Tenda G0 router firmware v15.11.0.5 allows remote unauthenticated attackers to crash the device by sending a crafted HTTP request that triggers a stack buffer overflow in the formIPMacBindModify handler via the IPMacBindRuleIp parameter. No public exploit identified at time of analysis, EPSS is very low (0.01%), and SSVC reports no observed exploitation, though CISA's SSVC marks the attack as automatable with partial technical impact.
RemediationAI
No vendor-released patch identified at time of analysis - there is no Tenda security bulletin in the provided references. Operators should check the Tenda support site for a firmware update newer than 15.11.0.5 for the G0 model and apply it as soon as one is published. As compensating controls, disable remote/WAN-side web management on the device (Tenda's 'Remote Web Management' setting) so the formIPMacBindModify endpoint is not reachable from the internet, and restrict LAN access to the administrative interface to a trusted management VLAN or specific source IPs via an upstream firewall; the trade-off is loss of remote administration convenience. If the IP-MAC binding feature is not in use, leaving it unconfigured does not remove the vulnerable parser, so network-level access restriction is the primary mitigation. Monitor the referenced research repository (https://github.com/xhh0124/SemVulLLM/tree/main/G0/formIPMacBindModify) and Tenda advisories for a confirmed fixed version.
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Technical ContextAI · show details
The vulnerability resides in the formIPMacBindModify CGI handler of the Tenda G0 SOHO/business router web management interface, which parses IP-MAC binding rules submitted via HTTP. The IPMacBindRuleIp parameter is copied into a fixed-size stack buffer without proper length validation, matching the CWE-120 classic buffer overflow ('Classic Buffer Overflow') root cause where bounds checking is missing on a string copy. This is a recurring class of bug in Tenda's web administration binaries (httpd/goahead-style handlers), where user-supplied form fields are passed directly to unsafe string operations such as strcpy/sprintf, corrupting saved frame state and typically crashing the embedded HTTP daemon.
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Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Single crafted HTTP request to an unauthenticated web form handler causes a crash, so AV:N/AC:L/PR:N/UI:N; impact is availability-only with no confirmed code execution.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
2DescriptionCVE.org
Shenzhen Tenda Technology Co., Ltd Tenda G0 v15.11.0.5 was discovered to contain a stack overflow in the IPMacBindRuleIp parameter of the formIPMacBindModify function. This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted HTTP request.
Executive ViewAI
Tenda G0 routers running firmware v15.11.0.5 are vulnerable to a remote denial-of-service attack that requires no authentication, potentially disrupting network connectivity across dependent systems. While the likelihood of immediate exploitation is currently low (no public exploit identified at time of analysis), the vulnerability affects critical network infrastructure and must be addressed to maintain operational resilience. Affected organizations should immediately identify at-risk devices and develop a remediation timeline.
Network segmentation restricting HTTP access to affected devices; ingress filtering to limit exposure; rate limiting on HTTP management interfaces; network-based intrusion detection monitoring for malformed HTTP requests targeting formIPMacBindModify handler; consider temporary isolation of affected routers pending patch availability.
Threat Intelligence Overview
NVD
CVE.org
EPSS
Vulnrichment
GitHub
How this decision was reached
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SSVC AssessmentENISA
Priority Score
Attack Technique
A buffer overflow occurs when a program writes more data to a memory buffer than it was allocated to hold, causing the excess data to spill into adjacent memory regions.
Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.
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