Executive brief
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 device, an attacker can cause the router to crash or reboot. This results in a denial-of-service, disrupting internet connectivity for all connected users until the device recovers.
Technical details
A vulnerability exists in the formWifiRadioSet CGI handler of the Tenda W3 router due to improper validation of the 'wl_radio' parameter. The handler retrieves this parameter via websGetVar and passes it to an internal function (FUN_004601a8), where it is converted to an integer using atoi() and used as an index for an array (local_414[local_438 * 10 + iVar1]). By providing an excessively large integer value for 'wl_radio', an attacker can trigger a buffer overread or stack overflow. This can be exploited via a network-reachable HTTP request without authentication, leading to a device crash or reboot (Denial of Service).
Affected products
- Tenda (Shenzhen Tenda Technology Co., Ltd) 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