PatchSiren cyber security CVE debrief

CVE-2026-36778 Shenzhen Tenda Technology Co., Ltd CVE debrief

A stack overflow vulnerability was discovered in the Tenda O3 Wireless Router v1.0.0.5(4180). The vulnerability exists in the username parameter of the R7WebsSecurityHandler function, allowing attackers to cause a Denial of Service (DoS) via a crafted HTTP request. This CVE has a CVSS score of 4.9 and a severity rating of MEDIUM.

Vendor: Shenzhen Tenda Technology Co., Ltd
Product: Tenda O3 Wireless Router
CVSS: MEDIUM 4.9
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 the Tenda O3 Wireless Router v1.0.0.5(4180) should be aware of this vulnerability and take steps to mitigate it.

Technical summary

The CVE-2026-36778 vulnerability is a stack overflow in the username parameter of the R7WebsSecurityHandler function in the Tenda O3 Wireless Router v1.0.0.5(4180). This allows attackers to cause a Denial of Service (DoS) via a crafted HTTP request.

Defensive priority

MEDIUM

Recommended defensive actions

Update to the latest firmware version if available.
Limit access to the router's web interface to trusted IP addresses.
Monitor for suspicious HTTP requests to the router.

Evidence notes

The CVE-2026-36778 vulnerability was discovered and reported by an unknown source. The CVE record and NVD detail pages provide additional information about this vulnerability.

Official resources

CVE-2026-36778 was published on 2026-06-09T19:17:44.090Z and modified on 2026-06-10T18:16:44.987Z.