# CVE-2026-36772: Tenda W3 Wireless Router stack overflow in formwrlSSIDget

Source: https://junglewise.ai/threats/cve-2026-36772-tenda-w3-wireless-router-stack-overflow-in-formwrlssidget  
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-2026-36772 · Severity: info · CVSS 7.5 · Published 2026-06-09

The Tenda W3 is a wireless router used for home and small office networking. A security flaw in the router's web management interface allows an attacker to send a specially crafted request that crashes the device. This results in a denial-of-service, cutting off internet access for all connected users until the device is manually restarted.

Technologies: [Tenda W3 Wireless Router](https://junglewise.ai/threats/technologies/w3-wireless-router). Vendors: [Tenda](https://junglewise.ai/threats/vendors/tenda).

## Quick answers

**Is CVE-2026-36772 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-36772 being exploited in the wild.

**How severe is CVE-2026-36772?** Informational severity, with a CVSS score of 7.5, published 9 June 2026.

**Which products and versions are affected?** Tenda W3 Wireless Router v1.0.0.3(2204).

**Is there a fix for CVE-2026-36772?** 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-2026-36772 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-36772?** Check whether you run Tenda W3 Wireless Router 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 W3 Wireless Router v1.0.0.3(2204) within the 'formwrlSSIDget' CGI handler. The vulnerability is located in the 'formwrlSSIDget' function where user-controlled input from the 'index' parameter is passed to 'sprintf' without length validation to construct a configuration key. While the 'wl_radio' parameter must be set to '0' to reach the vulnerable branch, the 'index' parameter can be manipulated to overflow the 'local_c14' stack buffer. An unauthenticated attacker can exploit this over the network via a crafted HTTP request to cause a crash or reboot (Denial of Service), and potentially achieve arbitrary code execution.

## Affected products

- Tenda W3 Wireless Router v1.0.0.3(2204)

## Timeline

- 2026-03-04: other: CVE request submitted to MITRE
- 2026-06-06: disclosed: Public disclosure
- 2026-06-09: advisory: NVD published date

## References

- [https://github.com/xhh0124/SemVulLLM/tree/main/W3/formwrlSSIDget](https://github.com/xhh0124/SemVulLLM/tree/main/W3/formwrlSSIDget)

## Related threats

- [Tenda W3 Wireless Router stack overflow in R7WebsSecurityHandler](https://junglewise.ai/threats/cve-2026-36794-tenda-w3-wireless-router-stack-overflow-in-r7webssecurityhandler)
- [Tenda W3 Wireless Router stack overflow in formwrlSSIDset](https://junglewise.ai/threats/cve-2026-36793-tenda-w3-wireless-router-stack-overflow-in-formwrlssidset)
- [Tenda W3 Wireless Router stack overflow in formWifiRadioSet](https://junglewise.ai/threats/cve-2026-36792-tenda-w3-wireless-router-stack-overflow-in-formwifiradioset)
- [Tenda W3 Wireless Router stack overflow in formSetCfm](https://junglewise.ai/threats/cve-2026-36777-tenda-w3-wireless-router-stack-overflow-in-formsetcfm)
- [Tenda W3 Wireless Router stack overflow in formwrlSSIDset](https://junglewise.ai/threats/cve-2026-36771-tenda-w3-wireless-router-stack-overflow-in-formwrlssidset)