# CVE-2026-36805: Tenda G0 and PW201A buffer overflow in Saveqqlist function

Source: https://junglewise.ai/threats/cve-2026-36805-tenda-g0-and-pw201a-buffer-overflow-in-saveqqlist-function  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-09. Updated: 2026-06-09  
License: CC BY 4.0 with a link back

CVE-2026-36805 · Severity: info · CVSS 7.5 · Published 2026-06-09

Tenda G0 and PW201A routers are affected by a security flaw in how they handle certain web-based configuration requests. By sending a specially crafted web request to the device, an attacker can cause the router to crash or become unstable. This results in a denial of service, disrupting internet connectivity and network operations for all connected users.

Technologies: [Tenda G0](https://junglewise.ai/threats/technologies/g0), [Tenda PW201A](https://junglewise.ai/threats/technologies/pw201a). Vendors: [Tenda](https://junglewise.ai/threats/vendors/tenda).

## Quick answers

**Is CVE-2026-36805 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-36805 being exploited in the wild.

**How severe is CVE-2026-36805?** Informational severity, with a CVSS score of 7.5, published 9 June 2026.

**Which products and versions are affected?** Tenda G0 v15.11.0.5; Tenda PW201A V1.0.5.

**Is there a fix for CVE-2026-36805?** 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-2026-36805 attacked?** It is attacked over the network, in device firmware.

**Am I affected by CVE-2026-36805?** Check whether you run Tenda G0 or Tenda PW201A 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 'TENDA_HTTPD' binary of Tenda G0 and PW201A devices. The vulnerability is located within the Saveqqlist function (called by the L7Im handler at offset 0x42d520), where user-supplied input from the 'qqStr' and 'markStr' HTTP parameters is processed using 'sprintf' without adequate bounds checking. An unauthenticated remote attacker can exploit this by sending a crafted HTTP request containing excessively long strings in these parameters. Successful exploitation leads to a process crash or device instability, resulting in a Denial of Service (DoS).

## Affected products

- Tenda G0 v15.11.0.5
- Tenda PW201A V1.0.5

## Timeline

- 2026-03-17: other: CVE request submitted to MITRE
- 2026-06-06: disclosed: Public disclosure of vulnerability details
- 2026-06-09: advisory: NVD published CVE-2026-36805

## References

- [https://github.com/xhh0124/SemVulLLM/tree/main/PW201A/L7IM](https://github.com/xhh0124/SemVulLLM/tree/main/PW201A/L7IM)

## Related threats

- [Tenda G0 buffer overflow in setPortMapping](https://junglewise.ai/threats/cve-2026-19792-tenda-g0-buffer-overflow-in-setportmapping)
- [Tenda G0 stack buffer overflow in addStaticRoute](https://junglewise.ai/threats/cve-2026-19791-tenda-g0-stack-buffer-overflow-in-addstaticroute)
- [Tenda G0 stack buffer overflow in port mirror handler](https://junglewise.ai/threats/cve-2026-19790-tenda-g0-stack-buffer-overflow-in-port-mirror-handler)
- [Tenda PW201A buffer overflow in qossetting](https://junglewise.ai/threats/cve-2026-36803-tenda-pw201a-buffer-overflow-in-qossetting)
- [Tenda PW201A buffer overflow in SafeMacFilter](https://junglewise.ai/threats/cve-2026-36802-tenda-pw201a-buffer-overflow-in-safemacfilter)