# CVE-2026-104611: Tenda AC9 stack buffer overflow in POST request handler

Source: https://junglewise.ai/threats/cve-2026-104611-a-vulnerability-was-detected-in-tenda-ac9-15-03-02-13-affected  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-02. Updated: 2026-10-05  
License: CC BY 4.0 with a link back

CVE-2026-104611 · Severity: critical · CVSS 9.1 · Published 2026-10-02

Tenda AC9 is a wireless router used in homes and small offices to provide internet connectivity. A vulnerability in its web-based settings interface allows an attacker on the network to send a specially crafted request that overwrites memory and executes arbitrary code, potentially giving them complete control of the router and access to all connected devices and network traffic.

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

## Quick answers

**Is CVE-2026-104611 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-104611 being exploited in the wild.

**How severe is CVE-2026-104611?** Critical severity, with a CVSS score of 9.1, published 2 October 2026.

**Which products and versions are affected?** Tenda Ac9 15.03.02.13 and likely other versions.

**Is there a fix for CVE-2026-104611?** 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-2026-104611 attacked?** It is attacked over the network, in device firmware.

**Am I affected by CVE-2026-104611?** Check whether you run Tenda Ac9 at an affected version. 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 exists in the /goform/fast_setting_internet_set endpoint of the Tenda AC9 firmware, triggered by manipulation of the netWanType parameter via POST request. The vulnerability allows unauthenticated remote code execution with no user interaction required. A public exploit is available, increasing the practical risk.

## Affected products

- Tenda AC9 15.03.02.13 and likely other versions

## Timeline

- 2026-10-02: disclosed

## References

- [https://github.com/ZaneBoden/CVEs/blob/main/Tenda-AC9-fast_setting_internet_set.md](https://github.com/ZaneBoden/CVEs/blob/main/Tenda-AC9-fast_setting_internet_set.md)
- [https://vuldb.com/cve/CVE-2026-104611](https://vuldb.com/cve/CVE-2026-104611)

## Related threats

- [Tenda AC9 authentication bypass in web management](https://junglewise.ai/threats/cve-2026-86300-tenda-ac9-authentication-bypass-in-web-management)
- [Tenda AC9 stack overflow in WizardHandle decodePwd](https://junglewise.ai/threats/cve-2026-6016-tenda-ac9-stack-overflow-in-wizardhandle-decodepwd)
- [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)