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Tenda HG10 CVE-2026-86166

| EUVDEUVD-2026-72050 HIGH
Classic Buffer Overflow (CWE-120)
2026-09-06 VulDB GHSA-q93p-5wpr-g629
7.4
CVSS 4.0 · Vendor: VulDB
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Severity by source

Vendor (VulDB) PRIMARY
7.4 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/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
vuln.today AI
8.8 HIGH

Network-accessible Boa server requires low-privileged auth per CVSS 4.0 PR:L; classic buffer overflow yields full device compromise with no scope change.

3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (VulDB).

CVSS VectorVendor: VulDB

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

4
POC Analysis Generated
Sep 06, 2026 - 11:21 vuln.today
Analysis Generated
Sep 06, 2026 - 04:29 vuln.today
CVSS changed
Sep 06, 2026 - 04:22 NVD
8.7 (HIGH) 7.4 (HIGH)
CVE Published
Sep 06, 2026 - 04:00 cve.org
HIGH 7.4

DescriptionCVE.org

A vulnerability was determined in Tenda HG10 300001138. This issue affects the function formWanRedirect of the file /boaform/formWanRedirect of the component Boa Web Server. Executing a manipulation of the argument if can lead to buffer overflow. The attack may be launched remotely. The exploit has been publicly disclosed and may be utilized.

AnalysisAI

Buffer overflow in the Tenda HG10 router (firmware version 300001138) via the formWanRedirect function allows a network-authenticated attacker to overwrite control-flow data in the Boa embedded web server process, enabling remote code execution or device crash. The vulnerable endpoint /boaform/formWanRedirect fails to validate the length of the if argument before copying it into a fixed-size buffer (CWE-120). …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
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Delivery
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Exploit
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Execution
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Impact
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Vulnerability AssessmentAI

Exploitation Exploitation requires network-reachable access to the Boa HTTP server on the Tenda HG10 and a low-privileged authenticated session (PR:L per the CVSS 4.0 vector), meaning a valid web interface credential is needed to reach the `/boaform/formWanRedirect` endpoint. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 score of 7.4 is grounded in a network-reachable, low-complexity attack requiring low privileges (PR:L), with high confidentiality, integrity, and availability impact on the vulnerable system. … 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 has been identified at time of analysis for the Tenda HG10. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours, identify all Tenda HG10 routers running firmware 300001138 in your environment and immediately restrict their network exposure-either by isolating them from untrusted networks or taking them offline if operationally feasible. …

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CVE-2026-86166 vulnerability details – vuln.today

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