Quick answers
- Is CVE-2026-36773 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-36773 being exploited in the wild.
- How severe is CVE-2026-36773?
- Informational severity, with a CVSS score of 7.5, published 9 June 2026.
- Which products and versions are affected?
- Tenda W3 v1.0.0.3(2204).
- Is there a fix for CVE-2026-36773?
- 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-2026-36773 attacked?
- It is attacked over the network, in a network appliance.
- Am I affected by CVE-2026-36773?
- Check whether you run Tenda W3 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' function of the Tenda W3 router firmware v1.0.0.3(2204). The vulnerability is triggered when the 'GO' HTTP parameter, retrieved via 'websGetVar', is passed to the 'ask_to_reboot' function and subsequently processed by an unbounded 'sprintf' call: 'sprintf(buf, "reboot.asp?page=%s", param_2)'. An attacker can provide an excessively long string in the 'GO' parameter to overflow the fixed-size stack buffer. This can lead to a crash of the 'httpd' process or a full device reboot, resulting in a Denial of Service. While the primary impact is DoS, arbitrary code execution may be possible depending on the presence of exploit mitigations like stack canaries or ASLR.
Affected products
- Tenda (Shenzhen Tenda Technology) W3 Wireless Router v1.0.0.3(2204)
Timeline
- 2026-03-04: other: CVE request submitted to MITRE
- 2026-06-06: disclosed: Public disclosure via GitHub repository
- 2026-06-09: advisory: NVD published date