Is CVE-2026-36770 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-36770 being exploited in the wild.

How severe is CVE-2026-36770?

Informational severity, with a CVSS score of 7.5, published 9 June 2026.

Which products and versions are affected?

Tenda W3 Wireless Router US_W3V1.0BR v1.0.0.3(2204).

Is there a fix for CVE-2026-36770?

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-2026-36770 attacked?

It is attacked over the network, in a network appliance.

Am I affected by CVE-2026-36770?

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.

CVE-2026-36770: Tenda W3 stack overflow in ask_to_reboot function

CVE-2026-36770 · Severity: info · CVSS 7.5 · Published 2026-06-09

A vulnerability exists in the Tenda W3 wireless router, a device used to provide internet connectivity in homes and small offices. An attacker can send a specially crafted web request to the router's management interface to cause the device to crash or reboot. This results in a denial of service, disrupting internet access for all connected users.

Technologies: Tenda W3 Wireless Router. Vendors: Tenda.

Quick answers

Is CVE-2026-36770 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-36770 being exploited in the wild.
How severe is CVE-2026-36770?: Informational severity, with a CVSS score of 7.5, published 9 June 2026.
Which products and versions are affected?: Tenda W3 Wireless Router US_W3V1.0BR v1.0.0.3(2204).
Is there a fix for CVE-2026-36770?: 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-2026-36770 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-36770?: 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 'ask_to_reboot' CGI handler of Tenda W3V1.0BR firmware version v1.0.0.3(2204). The vulnerability is located in the 'ask_to_reboot' function, which is reachable via the wireless configuration handler (FUN_00449844). The handler retrieves the user-controlled HTTP parameter 'GO' using 'websGetVar' and passes it to 'ask_to_reboot'. Inside this function, the input is concatenated into a fixed-size stack buffer using an unbounded 'sprintf' call: 'sprintf(buf, "reboot.asp?page=%s", param_2)'. An attacker can exploit this by sending an excessively long string in the 'GO' parameter, leading to a crash of the 'httpd' process or a device reboot. While primarily a Denial of Service (DoS) risk, arbitrary code execution may be possible depending on the presence of exploit mitigations like stack canaries or ASLR.

Affected products

Tenda W3 Wireless Router US_W3V1.0BR 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/ask_to_reboot

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