EUVD-2026-91570
GHSA-rw2m-x35c-9468
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Remote unauthenticated stack overflow in a network-facing web handler with no user interaction gives AV:N/AC:L/PR:N/UI:N; code execution on the device yields C:H/I:H/A:H, scope unchanged.
Primary rating from Vendor (VulDB).
CVSS VectorVendor: VulDB
Lifecycle Timeline
6DescriptionCVE.org
A security vulnerability has been detected in Tenda HG7, HG9 and HG10 300001138_en_xpon. This impacts the function boaGetVar of the file /boaform/formLoopBack of the component Boa Web Server. 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.
AnalysisAI
Stack-based buffer overflow in the Boa Web Server component of Tenda HG7, HG9 and HG10 XPON gateways running firmware 300001138_en_xpon allows remote, unauthenticated attackers to corrupt memory by sending a crafted request to the /boaform/formLoopBack endpoint with an oversized Ethtype argument. The assessed CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H, base 9.8) confirms no authentication or user interaction is required, and publicly available exploit code exists, so the practical risk hinges on whether the device's management web interface is reachable from the WAN or another untrusted network. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires network reachability to the device's Boa Web Server and the ability to send a request to the /boaform/formLoopBack endpoint with a manipulated Ethtype argument; per the CVSS vector (AV:N/AC:L/PR:N/UI:N) no authentication, no user interaction, and no special configuration are needed against affected firmware (HG7/HG9/HG10 300001138_en_xpon). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Signals are largely consistent and point to a genuine priority for anyone operating these specific Tenda devices. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | No vendor-released patch identified at time of analysis, so operators should treat exposure reduction as the primary control. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, produce a complete asset inventory of Tenda HG7, HG9 and HG10 XPON gateways and confirm which run firmware 300001138_en_xpon; for every such device, block untrusted network access to the Boa management web interface (TCP/80 and 443) and to the /boaform/formLoopBack endpoint at the perimeter, CPE firewall, or upstream ISP ACL, and confirm the setting with a scan from an external vantage point rather than relying on configuration claims. …
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Same weakness CWE-121 – Stack-based Buffer Overflow
View allSame technique Buffer Overflow
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External POC / Exploit Code
Leaving vuln.today