Which versions of Tenda are affected by CVE-2026-6016?

Tenda AC9 routers running firmware 15.03.02.13 contain a critical stack-based buffer overflow in the WizardHandle request handler that allows authenticated attackers to execute arbitrary code and…

Is there a public PoC exploit available for CVE-2026-6016?

Yes, a public proof-of-concept exploit is available for CVE-2026-6016. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2026-6016?

Within 24 hours: Identify all Tenda AC9 routers in production using firmware version 15.03.02.13 and document their network locations and administrative access controls. Within 7 days: Contact Tenda for firmware availability status and interim mitigation options; implement network segmentation to restrict administrative access to affected devices to authorized personnel only, and disable remote management if enabled. Within 30 days: Deploy firmware updates immediately upon vendor release; if no patch is released, evaluate replacement with alternative vendor equipment or implement strict access controls combined with continuous monitoring of administrative sessions.

Tenda CVE-2026-6016

Q: What is the CVSS score of CVE-2026-6016?

CVE-2026-6016 has a CVSS 4.0 base score of 7.4 (High). CVSS vector: 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. EPSS exploitation probability: 0.0%.

EUVD-2026-21312 HIGH

Stack-based Buffer Overflow (CWE-121)

2026-04-10 VulDB

GHSA-wqhq-hx3v-9xwh

Buffer Overflow Tenda Stack Overflow

7.4

CVSS 4.0 · NVD

Severity by source

NVD 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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Lifecycle Timeline

PoC Detected

Apr 10, 2026 - 06:16 vuln.today

Public exploit code

EUVD ID Assigned

Apr 10, 2026 - 05:45 euvd

EUVD-2026-21312

Analysis Generated

Apr 10, 2026 - 05:45 vuln.today

CVE Published

Apr 10, 2026 - 05:00 nvd

HIGH 7.4

DescriptionCVE.org

A vulnerability was found in Tenda AC9 15.03.02.13. The affected element is the function decodePwd of the file /goform/WizardHandle of the component POST Request Handler. Performing a manipulation of the argument WANS results in stack-based buffer overflow. The attack can be initiated remotely. The exploit has been made public and could be used.

AnalysisAI

Stack-based buffer overflow in Tenda AC9 router firmware 15.03.02.13 enables authenticated remote attackers to execute arbitrary code or crash the device. The vulnerability resides in the decodePwd function within /goform/WizardHandle POST request handler, triggered by manipulating the WANS parameter. Attack requires low-privilege authentication but no user interaction. CVSS 8.8 (High) reflects potential for complete system compromise. Publicly available exploit code exists; no confirmed active exploitation (CISA KEV).

Technical ContextAI

CWE-121 stack-based buffer overflow occurs in decodePwd function processing WANS parameter without adequate bounds checking. POST handler at /goform/WizardHandle accepts oversized input, overwriting stack memory. CVSS vector PR:L indicates exploitation requires authenticated access, reducing attack surface but enabling lateral movement post-credential compromise.

RemediationAI

No vendor-released patch identified at time of analysis. Monitor Tenda support portal (https://www.tenda.com.cn/) for firmware updates addressing CVE-2026-6016. Immediate mitigations: restrict administrative access to trusted IP addresses via firewall rules, disable remote management interfaces if not operationally required, enforce strong authentication credentials to limit PR:L attack vector exploitation. Evaluate device replacement if vendor does not issue patch within acceptable timeframe. Network segmentation isolates vulnerable routers from critical infrastructure. Advisory reference: https://vuldb.com/vuln/356572 provides technical details and proof-of-concept context.