# CVE-2026-36789: Tenda AC1206 stack overflow in fromGstDhcpSetSer

Source: https://junglewise.ai/threats/cve-2026-36789-tenda-ac1206-stack-overflow-in-fromgstdhcpsetser  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-08. Updated: 2026-06-08  
License: CC BY 4.0 with a link back

CVE-2026-36789 · Severity: info · CVSS 7.5 · Published 2026-06-08

The Tenda AC1206 router, a device used to provide wireless internet access, contains a security flaw in its web management interface. An attacker can send a specially crafted web request to the device to cause it to crash or reboot. This results in a denial of service, disrupting internet connectivity for all connected users.

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

## Quick answers

**Is CVE-2026-36789 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-36789 being exploited in the wild.

**How severe is CVE-2026-36789?** Informational severity, with a CVSS score of 7.5, published 8 June 2026.

**Which products and versions are affected?** Tenda AC1206 v15.03.06.23.

**Is there a fix for CVE-2026-36789?** 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-2026-36789 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-36789?** 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 exists in the 'fromGstDhcpSetSer' CGI handler of the Tenda AC1206 router (firmware v15.03.06.23). The vulnerability is triggered when the 'dips' parameter (and potentially 'username'/'password' parameters) is processed without adequate length validation. Specifically, the code uses 'strrchr' to find a period character and calculates a length for 'strncpy' based on the result; if the period is missing, the calculation can lead to a large copy operation that overflows the stack buffer. An unauthenticated attacker can exploit this by sending a crafted HTTP request to the affected endpoint, leading to a device crash (DoS) or potentially remote code execution.

## Affected products

- Tenda (Shenzhen Tenda Technology Co., Ltd) AC1206 v15.03.06.23

## Timeline

- 2026-03-10: other: CVE request submitted to MITRE
- 2026-06-06: disclosed: Public disclosure
- 2026-06-08: advisory: NVD published date

## References

- [https://github.com/xhh0124/SemVulLLM/tree/main/AC1206/fromGstDhcpSetSer](https://github.com/xhh0124/SemVulLLM/tree/main/AC1206/fromGstDhcpSetSer)

## 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 WifiGuestSet](https://junglewise.ai/threats/cve-2026-19789-tenda-ac1206-stack-buffer-overflow-in-wifiguestset)
- [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)