PatchSiren cyber security CVE debrief

CVE-2026-36799 Shenzhen Tenda Technology Co., Ltd CVE debrief

A buffer overflow vulnerability was discovered in the portalAuth parameter of the formPortalAuth function in Tenda G0 v15.11.0.5. This HIGH severity vulnerability, with a CVSS score of 7.5, allows attackers to cause a Denial of Service (DoS) via a crafted HTTP request. The vulnerability was published on [cve-org](https://www.cve.org/CVERecord?id=CVE-2026-36799) and additional details can be found on [nvd](https://nvd.nist.gov/vuln/detail/CVE-2026-36799).

Vendor: Shenzhen Tenda Technology Co., Ltd
Product: Tenda G0
CVSS: HIGH 7.5
CISA KEV: Not listed in stored evidence
Original CVE published: 2026-06-09
Original CVE updated: 2026-06-10
Advisory published: 2026-06-09
Advisory updated: 2026-06-10

Who should care

Administrators and users of Tenda G0 v15.11.0.5 should be aware of this vulnerability and take necessary actions to mitigate the risk.

Technical summary

The vulnerability is caused by a buffer overflow in the portalAuth parameter of the formPortalAuth function. This allows attackers to cause a Denial of Service (DoS) via a crafted HTTP request.

Defensive priority

HIGH

Recommended defensive actions

Apply patches or updates provided by the vendor to fix the buffer overflow vulnerability.
Restrict access to the affected system and limit the attack surface.
Monitor system logs for suspicious activity and implement additional security measures if necessary.

Evidence notes

The vulnerability was published on June 9, 2026, and modified on June 10, 2026. The CVSS score is 7.5, indicating a HIGH severity vulnerability.

Official resources

CVE-2026-36799 was published on 2026-06-09T19:17:45.487Z and modified on 2026-06-10T20:17:00.050Z.