CVE-2026-2909 Details
Description
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.
A stack-based buffer overflow vulnerability has been identified in the Tenda HG9 router, specifically in the firmware version 300001138. The issue arises in the diagnostic ping endpoint located at '/boaform/formPing'. The vulnerability is triggered by manipulating the 'pingAddr' argument, which is not properly validated before being processed. When the 'pingAddr' input exceeds 512 bytes, it can overflow the stack buffer, potentially overwriting the return address and leading to arbitrary code execution. This vulnerability can be exploited remotely, and a public exploit is available.
It is recommended to replace the unsafe 'sprintf' function with 'snprintf' in the error handling logic of the 'formPing' function. Additionally, implement input validation to ensure that the 'pingAddr' length does not exceed a reasonable limit, such as 256 bytes.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Feb 23, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/QIU-DIE/cve-nneeww/issues/11 | [email protected] | ExploitIssue TrackingMitigationThird Party Advisory |
| https://vuldb.com/?ctiid.347218 | [email protected] | Permissions RequiredVDB Entry |
| https://vuldb.com/?id.347218 | [email protected] | Third Party AdvisoryVDB Entry |
| https://vuldb.com/?submit.755211 | [email protected] | Third Party AdvisoryVDB Entry |
| https://www.tenda.com.cn/ | [email protected] | Product |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-119 | Improper Restriction of Operations within the Bounds of a Memory Buffer | [email protected] |
| CWE-121 | Stack-based Buffer Overflow | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| tenda hg9 firmware | 300001138 |
CPE
Remediation
| |
| tenda hg9 | All versions |
CPE
Remediation
| |
Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Feb 23, 2026 | Initial Analysis | [email protected] |
| Feb 22, 2026 | New CVE Received | [email protected] |