Is CVE-2026-36799 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-36799 being exploited in the wild.

How severe is CVE-2026-36799?

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

Is there a fix for CVE-2026-36799?

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-2026-36799 attacked?

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

Am I affected by CVE-2026-36799?

Check whether you run Tenda G0 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-2026-36799: Tenda G0 buffer overflow in formPortalAuth

CVE-2026-36799 · Severity: info · CVSS 7.5 · Published 2026-06-09

The Tenda G0 router is susceptible to a security flaw that can be triggered by sending a specifically formatted web request. An attacker can exploit this to crash the device's management interface or cause the entire router to become unstable. This results in a denial of service, disrupting network connectivity and administrative access for the organization.

Technologies: Tenda G0. Vendors: Tenda.

Quick answers

Is CVE-2026-36799 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-36799 being exploited in the wild.
How severe is CVE-2026-36799?: Informational severity, with a CVSS score of 7.5, published 9 June 2026.
Which products and versions are affected?: Tenda G0 v15.11.0.5.
Is there a fix for CVE-2026-36799?: 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-2026-36799 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-36799?: Check whether you run Tenda G0 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 'formPortalAuth' function of the Tenda G0 v15.11.0.5 firmware. The vulnerability is located in the handling of the 'gotoUrl' HTTP parameter, which is retrieved via 'websGetVar' and subsequently passed to 'strcpy' without proper bounds checking into a fixed-size stack buffer (acStack_210). An unauthenticated remote attacker can exploit this by sending a crafted HTTP request with an excessively long string in the 'gotoUrl' parameter. Successful exploitation leads to a crash of the web service or device instability, resulting in a Denial of Service (DoS).

Affected products

Tenda (Shenzhen Tenda Technology) G0 v15.11.0.5

Timeline

2026-03-17: other: CVE request submitted to MITRE
2026-06-06: disclosed: Public disclosure of vulnerability details
2026-06-09: advisory: NVD publication date

References

https://github.com/xhh0124/SemVulLLM/tree/main/G0/formPortalAuth

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