Quick answers
- Is CVE-2026-36771 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-36771 being exploited in the wild.
- How severe is CVE-2026-36771?
- 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-2026-36771?
- 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-2026-36771 attacked?
- It is attacked over the network, in a network appliance.
- Am I affected by CVE-2026-36771?
- 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 'formwrlSSIDset' CGI handler of the Tenda W3 router (firmware v1.0.0.3(2204)). The vulnerability is located in the handling of the 'index' parameter, which is retrieved via 'websGetVar' and subsequently passed to 'sprintf' to construct a configuration key (e.g., 'wl2g.ssid%s.'). Because the 'index' parameter is attacker-controlled and lacks length validation before being written into a fixed-size stack buffer, a long input string triggers the overflow. An attacker can reach this code path by setting the 'wl_radio' parameter to '0'. While the primary impact is a crash leading to Denial of Service (DoS), stack exhaustion of this nature may theoretically allow for remote 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