Hg9 Firmware
CVE-2026-2909
HIGH
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain
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AccessAuthenticate to Tenda HG9 web interface
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DeliverySend POST request to /boaform/formPing
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ExploitInject oversized payload in pingAddr 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A06:2021 - Vulnerable and Outdated Components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 Diagnostic Ping Endpoint accessible at /boaform/formPing; requires valid authentication credentials to access the endpoint; remote unauthenticated users cannot exploit without valid login. |
| 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-based buffer overflow in the Diagnostic Ping Endpoint of Tenda HG9 firmware allows unauthenticated remote attackers to achieve code execution by supplying a malicious pingAddr parameter. The vulnerability exists in the /boaform/formPing component and is exploitable over the network with low complexity. Public exploit code exists and no patch is currently available.
Earlier versions of this analysis (1)
A vulnerability was detected in Tenda HG9 300001138. This affects an unknown part of the file /boaform/formPing of the component Diagnostic Ping 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 detected in Tenda HG9 300001138. This affects an unknown part of the file /boaform/formPing of the component Diagnostic Ping Endpoint. Performing a manipulation of the argument pingAddr results in stack-based buffer overflow. The attack is possible to be carried out remotely. The exploit is now public and may 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 detected in Tenda HG9 300001138. This affects an unknown part of the file /boaform/formPing of the component Diagnostic Ping Endpoint. Performing a manipulation of the argument pingAddr results in stack-based buffer overflow. The attack is possible to be carried out remotely. The exploit is now public and may be used.
Executive ViewAI
A high-severity vulnerability (CVSS 8.8) affects Tenda HG9 routers, potentially allowing remote attackers to compromise network infrastructure without authentication. Organizations using this device model face immediate risk to network integrity and data security, with active exploits already circulating in the wild.
Disable the /boaform/formPing endpoint if not operationally required; implement network segmentation to restrict access to affected devices; deploy WAF rules to block suspicious requests to the diagnostic ping component; restrict administrative access via network ACLs; monitor for unauthorized diagnostic requests; consider replacing affected hardware with alternative vendors that provide 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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