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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.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-36778 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-36778

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-36778 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-36778

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.