EUVD-2026-91579
GHSA-5xvg-86hf-5h5q
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/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
Endpoint requires an authenticated admin session so PR:H; network-reachable web interface gives AV:N/AC:L; the stack overflow yields full device code execution so C/I/A:H, scope unchanged (device itself).
Primary rating from Vendor (VulDB).
CVSS VectorVendor: VulDB
Lifecycle Timeline
7DescriptionCVE.org
A vulnerability was detected in Tenda AC9 15.03.02.13. Affected is an unknown function of the file /goform/fast_setting_internet_set of the component POST Request Handler. Performing a manipulation of the argument netWanType results in stack-based buffer overflow. The attack is possible to be carried out remotely. The exploit is now public and may be used.
AnalysisAI
Stack-based buffer overflow in the Tenda AC9 wireless router (firmware 15.03.02.13) allows an attacker to corrupt memory and potentially execute code remotely by sending a crafted POST request containing an oversized netWanType parameter to the /goform/fast_setting_internet_set endpoint. Exploitation requires a privileged session on the device's web management interface (CVSS 4.0 PR:H / assessed CVSS 3.1 PR:H), and in default deployments the management UI is LAN-facing, so remote reach generally depends on remote management being enabled or unchanged default credentials. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires an authenticated session on the Tenda AC9 web management interface (PR:H) to reach the /goform/fast_setting_internet_set endpoint; the attacker then supplies a malicious netWanType parameter in the POST body to trigger the stack-based overflow. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The provided CVSS 4.0 vector scores 8.5 (High) with AV:N/AC:L/PR:H/UI:N and full vulnerable-system impact (VC:H/VI:H/VA:H). … 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: the reference set contains only the VulDB entries (https://vuldb.com/vuln/412918, https://vuldb.com/vuln/412918/cti, https://vuldb.com/cve/CVE-2026-104611), the public exploit write-up (https://github.com/ZaneBoden/CVEs/blob/main/Tenda-AC9-fast_setting_internet_set.md), and the Tenda homepage (https://www.tenda.com.cn/), with no fixed firmware version or vendor advisory. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Tenda AC9 devices running firmware 15.03.02.13, immediately disable WAN-side/remote management on every unit, and rotate any management credentials that remain at factory defaults or are shared; also block inbound access to the device web interface at the network perimeter. …
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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