# CVE-2026-6016: Tenda AC9 stack overflow in WizardHandle decodePwd

Source: https://junglewise.ai/threats/cve-2026-6016-tenda-ac9-stack-overflow-in-wizardhandle-decodepwd  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-04-10. Updated: 2026-05-10  
License: CC BY 4.0 with a link back

CVE-2026-6016 · Severity: high · CVSS 8.8 · Published 2026-04-10

A vulnerability exists in the Tenda AC9 router, a device used to provide wireless internet connectivity in homes and small offices. An attacker can exploit this flaw to cause a system crash or potentially take control of the device by sending a specially crafted web request. This could lead to a total loss of internet availability or unauthorized access to the local network.

Technologies: [Tenda Ac9](https://junglewise.ai/threats/technologies/ac9), [Tenda Ac9 Firmware](https://junglewise.ai/threats/technologies/ac9-firmware). Vendors: [Tenda](https://junglewise.ai/threats/vendors/tenda).

## Quick answers

**Is CVE-2026-6016 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-6016 being exploited in the wild.

**How severe is CVE-2026-6016?** High severity, with a CVSS score of 8.8, published 10 April 2026.

**Which products and versions are affected?** Tenda AC9 15.03.02.13.

**Is there a fix for CVE-2026-6016?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-6016 attacked?** It is attacked over the network, in device firmware.

**Am I affected by CVE-2026-6016?** Check whether you run Tenda Ac9 or Tenda Ac9 Firmware. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A stack-based buffer overflow vulnerability exists in the Tenda AC9 router (firmware version 15.03.02.13). The flaw is located within the decodePwd function of the /goform/WizardHandle file, which serves as a POST request handler. An attacker can trigger the overflow by manipulating the 'WANS' argument. This is a remote attack that requires low privileges (authenticated access). Successful exploitation can lead to remote code execution (RCE) or a denial of service (DoS) condition. Public exploit code is reportedly available.

## Affected products

- Tenda AC9 15.03.02.13

## Timeline

- 2026-04-10: disclosed
- 2026-04-10: advisory

## References

- [https://lavender-bicycle-a5a.notion.site/Tenda-AC9-WizardHandle-33153a41781f808480f9e3b78ce438e0?source=copy_link](https://lavender-bicycle-a5a.notion.site/Tenda-AC9-WizardHandle-33153a41781f808480f9e3b78ce438e0?source=copy_link)
- [https://vuldb.com/submit/791829](https://vuldb.com/submit/791829)
- [https://vuldb.com/vuln/356572](https://vuldb.com/vuln/356572)
- [https://vuldb.com/vuln/356572/cti](https://vuldb.com/vuln/356572/cti)
- [https://www.tenda.com.cn/](https://www.tenda.com.cn/)

## Related threats

- [Tenda AC9 stack buffer overflow in POST request handler](https://junglewise.ai/threats/cve-2026-104611-a-vulnerability-was-detected-in-tenda-ac9-15-03-02-13-affected)
- [Tenda AC9 authentication bypass in web management](https://junglewise.ai/threats/cve-2026-86300-tenda-ac9-authentication-bypass-in-web-management)
- [Tenda AC9 stack-based buffer overflow in QuickIndex](https://junglewise.ai/threats/cve-2026-6015-tenda-ac9-stack-based-buffer-overflow-in-quickindex)
- [Tenda AC7, AC9, and AC10 Routers Command Injection Vulnerability](https://junglewise.ai/threats/cve-2018-14558-tenda-ac7-ac9-and-ac10-routers-command-injection-vulnerability)