# CVE-2026-36793: Tenda W3 Wireless Router stack overflow in formwrlSSIDset

Source: https://junglewise.ai/threats/cve-2026-36793-tenda-w3-wireless-router-stack-overflow-in-formwrlssidset  
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-2026-36793 · Severity: info · Published 2026-06-09

The Tenda W3 wireless router, used for home and small office networking, contains a security flaw in its web management interface. By sending a specially crafted web request to the router, an attacker can cause the device to crash or reboot. This results in a denial of service, disrupting internet connectivity for all connected users and requiring a manual restart to restore operations.

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-2026-36793 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-36793 being exploited in the wild.

**How severe is CVE-2026-36793?** Informational severity, 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-2026-36793?** 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-2026-36793 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-36793?** 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 vulnerability exists in the Tenda W3 router's CGI handler function FUN_00442b44 (formwrlSSIDset). The vulnerability is triggered when the application processes user-supplied HTTP parameters 'mit_ssid' and 'mis_ssid_index' via websGetVar. These values are subsequently passed to an unsafe sprintf call without proper bounds checking, leading to a buffer overflow on the stack. An unauthenticated remote attacker can exploit this by sending a crafted HTTP request with excessively long strings in these parameters. Successful exploitation results in a crash of the httpd service or a full device reboot, causing a Denial of Service.

## Affected products

- Tenda W3 Wireless Router v1.0.0.3(2204)

## Timeline

- 2026-03-15: 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/FUN_00442b44](https://github.com/xhh0124/SemVulLLM/tree/main/W3/FUN_00442b44)

## 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 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 formwrlSSIDget](https://junglewise.ai/threats/cve-2026-36772-tenda-w3-wireless-router-stack-overflow-in-formwrlssidget)
- [Tenda W3 Wireless Router stack overflow in formwrlSSIDset](https://junglewise.ai/threats/cve-2026-36771-tenda-w3-wireless-router-stack-overflow-in-formwrlssidset)