# CVE-2026-19789: Tenda AC1206 stack buffer overflow in WifiGuestSet

Source: https://junglewise.ai/threats/cve-2026-19789-tenda-ac1206-stack-buffer-overflow-in-wifiguestset  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-08-14. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-19789 · Severity: high · CVSS 8.8 · Published 2026-08-14

Tenda AC1206 is a wireless router used to provide internet connectivity in homes and small offices. A remote attacker can exploit a buffer overflow vulnerability in the web management interface to execute arbitrary code on the router, potentially gaining full control of the network and compromising all connected devices and data.

Technologies: [Tenda AC1206](https://junglewise.ai/threats/technologies/ac1206). Vendors: [Tenda](https://junglewise.ai/threats/vendors/tenda).

## Quick answers

**Is CVE-2026-19789 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-19789 being exploited in the wild.

**How severe is CVE-2026-19789?** High severity, with a CVSS score of 8.8, published 14 August 2026.

**Which products and versions are affected?** Tenda AC1206 15.03.06.23_multi_TD01.

**Is there a fix for CVE-2026-19789?** 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-2026-19789 attacked?** It is attacked over the network, in device firmware.

**Am I affected by CVE-2026-19789?** Check whether you run Tenda AC1206 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 vulnerability exists in the httpd web management interface of Tenda AC1206, specifically in the set_wl_guest_iplist function within the /goform/WifiGuestSet endpoint. The vulnerability is triggered by improper validation of the shareSpeed parameter, allowing an attacker to overwrite stack memory and potentially achieve remote code execution. The attack is remotely exploitable without authentication requirements. Exploitation details have been publicly disclosed, and patches may be available from the vendor.

## Affected products

- Tenda AC1206 15.03.06.23_multi_TD01

## Timeline

- 2026-08-14: disclosed: Publicly disclosed on GitHub

## References

- [https://github.com/lipenghai/iot_bug/blob/main/Tenda/AC12/2.md](https://github.com/lipenghai/iot_bug/blob/main/Tenda/AC12/2.md)
- [https://vuldb.com/cve/CVE-2026-19789](https://vuldb.com/cve/CVE-2026-19789)

## Related threats

- [Tenda AC1206 authentication bypass in Web UI](https://junglewise.ai/threats/cve-2026-82694-tenda-ac1206-authentication-bypass-in-web-ui)
- [Tenda AC1206 authentication bypass in web UI telnet function](https://junglewise.ai/threats/cve-2026-82693-tenda-ac1206-authentication-bypass-in-web-ui-telnet-function)
- [Tenda AC1206 stack buffer overflow in device name handler](https://junglewise.ai/threats/cve-2026-19788-tenda-ac1206-stack-buffer-overflow-in-device-name-handler)
- [Tenda AC1206 stack overflow in fromGstDhcpSetSer](https://junglewise.ai/threats/cve-2026-36789-tenda-ac1206-stack-overflow-in-fromgstdhcpsetser)