CVE-2026-2908 Details
Description
A security vulnerability has been detected in Tenda HG9 300001138. Affected by this issue is some unknown functionality of the file /boaform/formLoopBack of the component Loopback Detection Configuration Endpoint. Such manipulation of the argument Ethtype leads to stack-based buffer overflow. The attack can be executed remotely. The exploit has been disclosed publicly 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 Loopback Detection configuration endpoint '/boaform/formLoopBack', where the 'Ethtype' parameter is processed without proper input length validation. This flaw allows for remote exploitation by overwriting the stack buffer and adjacent variables, including the return address, potentially leading to arbitrary code execution with root privileges. Additionally, the vulnerability can cause a denial-of-service by crashing the 'httpd' service.
It is recommended to use safer functions like 'snprintf' for input handling to prevent buffer overflows, validate the length of the 'Ethtype' parameter before processing, and increase the buffer size to accommodate expected input.
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/10 | [email protected] | ExploitIssue TrackingMitigationThird Party Advisory |
| https://vuldb.com/?ctiid.347217 | [email protected] | Permissions RequiredVDB Entry |
| https://vuldb.com/?id.347217 | [email protected] | Third Party AdvisoryVDB Entry |
| https://vuldb.com/?submit.755202 | [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] |