Hg9 Firmware
CVE-2026-2905
HIGH
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain
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AccessAuthenticate to Tenda HG9 device
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DeliverySend crafted request to /boaform/formWlanSetup
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ExploitInject oversized SSID parameter
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ExecutionOverflow stack buffer
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ImpactExecute arbitrary code
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A06:2021 - Vulnerable and Outdated Components
ASVS 5.0
V15 - Secure Coding and Architecture Bounds checking, buffer size validation
MITRE ATT&CK
2 techniques across 2 tactics: Execution, Privilege Escalation The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Exploitation Conditions | Tenda HG9 300001138 with Wireless Configuration Endpoint accessible. Requires valid authentication credentials (PR:L). Attack targets the /boaform/formWlanSetup endpoint with malicious SSID parameter in wireless configuration requests. |
| Impact | CVSS 8.8 (HIGH). Attack vector: Network. Complexity: Low. Privileges required: Low. User interaction: None. Exploitable via remote/network. Public exploit/POC available. |
| Exploit ScenarioDerived | A remote attacker could exploit this flaw, stack-based buffer overflow. |
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Alert meAnalysisAIv1 – Mar 12, 2026
Stack buffer overflow in Tenda HG9 firmware's wireless configuration endpoint allows authenticated remote attackers to achieve arbitrary code execution through a malicious SSID parameter. Public exploit code exists for this vulnerability, increasing the risk of active exploitation. The vulnerability affects the /boaform/formWlanSetup component and currently has no available patch.
Earlier versions of this analysis (1)
A vulnerability was identified in Tenda HG9 300001138. This impacts an unknown function of the file /boaform/formWlanSetup of the component Wireless Configuration Endpoint. [CVSS 8.8 HIGH]
RemediationAI
Monitor vendor advisories for a patch. Enable ASLR, DEP/NX, and stack canaries where possible. Restrict network access to the affected service where possible.
Affects your stack
Find out whether the stacks and servers you run are on an affected version.
Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Technical ContextAI · show details
Classified as CWE-119 (Buffer Overflow). Affects Hg9 Firmware. A vulnerability was identified in Tenda HG9 300001138. This impacts an unknown function of the file /boaform/formWlanSetup of the component Wireless Configuration Endpoint. The manipulation of the argument ssid leads to stack-based buffer overflow. The attack may be initiated remotely. The exploit is publicly available and might be used.
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- Exploit and PoC references, threat intelligence from 22 sources
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Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
Lifecycle Timeline
2DescriptionCVE.org
A vulnerability was identified in Tenda HG9 300001138. This impacts an unknown function of the file /boaform/formWlanSetup of the component Wireless Configuration Endpoint. The manipulation of the argument ssid leads to stack-based buffer overflow. The attack may be initiated remotely. The exploit is publicly available and might be used.
Executive ViewAI
A critical vulnerability affecting Tenda HG9 wireless routers could allow unauthorized attackers to compromise network configuration without authentication. Organizations using this device model face immediate risk of network infiltration and data exposure, particularly concerning given the public availability of exploit code and lack of available patches.
Implement network segmentation to restrict administrative access to wireless configuration endpoints; deploy WAF rules to block unauthorized requests to /boaform/formWlanSetup; disable remote management features if not required; monitor for suspicious wireless configuration changes; place devices behind authenticated reverse proxy; consider replacing vulnerable devices with vendor alternatives that have available security patches.
Threat Intelligence Overview
NVD
CVE.org
EPSS
GitHub
VulDB
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.
A stack-based buffer overflow occurs when a program writes more data to a buffer located on the stack than it was allocated to hold.
Affected Products (CPE)CVE.org
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