Tenda G0
CVE-2026-36801
HIGH
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain
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AccessReach router HTTP management interface
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DeliveryCraft POST to /goform/formIPMacBindAdd
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ExploitSend oversized IPMacBindRule parameter
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ExecutionOverflow fixed-size buffer in httpd
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PersistCrash router process
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ImpactNetwork connectivity lost until reboot
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 | Reachability of the Tenda G0 device's HTTP management interface (default TCP/80) from the attacker's network position, and the device running firmware v15.11.0.5 with the formIPMacBindAdd handler exposed. Per CVSS PR:N/UI:N, no authentication or user interaction is required, so any host that can reach the web UI can trigger the crash. The practical limiter is exposure: in default deployments the admin interface is LAN-only, so internet-based exploitation requires that an administrator has explicitly enabled WAN-side remote management or that the LAN is otherwise reachable (compromised internal host, hostile guest Wi-Fi segment). |
| Impact | Signals are mixed but lean toward moderate priority. CVSS 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) reflects easy remote reach but availability-only impact - there is no indication of code execution or memory disclosure in the description. EPSS is at the floor (0.01%, 2nd percentile) and the CVE is not on CISA KEV, so no public exploit identified at time of analysis. The sole reference points to a research repository (SemVulLLM) rather than a vendor advisory or weaponized PoC, suggesting this was found via automated/LLM-assisted fuzzing. Conflicting note: the description states only DoS, but buffer overflows in Tenda httpd binaries have historically been escalated to RCE by researchers - the A:H-only scoring may understate worst-case impact if a skilled attacker controls the overflow precisely. Verify with vendor or by reviewing the linked PoC. |
| Exploit ScenarioDerived | An attacker on the same LAN - or on the internet if WAN-side management is enabled - sends a single HTTP POST to the router's /goform/formIPMacBindAdd endpoint with an overlong IPMacBindRule value. The httpd process copies the oversized string into a fixed buffer, corrupts the stack, and crashes, knocking the router offline and severing all traffic behind it until it reboots or is manually power-cycled. A proof-of-concept appears to exist in the linked SemVulLLM research repository, though it has not been catalogued as a weaponized exploit. |
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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 to the formIPMacBindAdd handler with an oversized IPMacBindRule parameter. The flaw is a classic stack/heap buffer overflow (CWE-120) reachable over the network without authentication or user interaction, but its impact is limited to availability (CVSS 7.5, A:H only). No public exploit identified at time of analysis and EPSS exploitation probability is negligible at 0.01%.
RemediationAI
No vendor-released patch identified at time of analysis - Tenda has not published an advisory or fixed firmware build in the supplied data. Until a fixed firmware is released, restrict access to the device's web management interface (typically TCP/80 and TCP/443) to trusted management VLANs or jump hosts via ACLs on upstream switches/firewalls, since the vulnerable endpoint is in the admin HTTP service; this trade-off breaks remote browser-based administration. Disable WAN-side management entirely (a setting present on most Tenda devices) to prevent internet-borne exploitation, accepting the loss of remote support workflows. Monitor the research repository at https://github.com/xhh0124/SemVulLLM/tree/main/G0/formIPMacBindAdd and Tenda's security page for an updated firmware build, and consider replacing end-of-support hardware if no patch arrives.
Affects your stack
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Technical ContextAI · show details
Tenda G0 is a small-business VPN/router appliance produced by Shenzhen Tenda Technology. Its web management interface exposes a CGI-style endpoint backed by the formIPMacBindAdd function, which processes IP-to-MAC binding rules submitted through the IPMacBindRule HTTP parameter. The underlying weakness is CWE-120 (Classic Buffer Copy Without Checking Size of Input): the handler copies attacker-controlled data into a fixed-size buffer without bounds validation, a pattern repeatedly observed in Tenda's httpd binary across many models. The supplied CPE (cpe:2.3:a:n/a:n/a:*) is a placeholder and does not formally identify the product; the affected product must be derived from the description (Tenda G0 firmware v15.11.0.5).
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Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Primary rating from Vendor (mitre) · only source for this CVE.
CVSS VectorVendor: mitre
Lifecycle Timeline
2DescriptionCVE.org
Shenzhen Tenda Technology Co., Ltd Tenda G0 v15.11.0.5 was discovered to contain a buffer overflow in the IPMacBindRule parameter of the formIPMacBindAdd function. This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted HTTP request.
Executive ViewAI
Tenda G0 router firmware v15.11.0.5 contains an unpatched denial-of-service vulnerability allowing unauthenticated network attackers to remotely crash affected devices, creating potential network outages across dependent infrastructure. No patch is currently available from the vendor, and while exploitation likelihood remains low, any deployment of this firmware version faces persistent availability risk until patched or replaced.
No vendor-released patch identified at time of analysis. Interim mitigations: (1) Network segmentation - restrict layer-3 access to affected routers from untrusted networks; (2) WAF/IDS rules - detect and block oversized IPMacBindRule parameters in HTTP requests to formIPMacBindAdd handler; (3) Device monitoring - establish baselines for device stability and alert on unexpected restarts; (4) Configuration backup - maintain backup of router settings to enable rapid recovery if device crashes; (5) Redundancy - deploy secondary routing infrastructure to tolerate single-device failure.
Threat Intelligence Overview
NVD
CVE.org
EPSS
Vulnrichment
GitHub
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
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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