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PatchSiren cyber security CVE debrief

CVE-2026-36818 Shenzhen Tenda Technology Co., Ltd CVE debrief

A buffer overflow vulnerability was discovered in Shenzhen Tenda Technology Co., Ltd Tenda W20E v15.11.0.6. The vulnerability is located in the wewifiWhiteUserInfo parameter of the formAddWewifiWhiteUser function. This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted HTTP request. The Common Vulnerability Scoring System (CVSS) score for this vulnerability is 7.5, indicating a HIGH severity.

Vendor
Shenzhen Tenda Technology Co., Ltd
Product
Tenda W20E
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 W20E v15.11.0.6 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 wewifiWhiteUserInfo parameter of the formAddWewifiWhiteUser function. This allows attackers to cause a Denial of Service (DoS) via a crafted HTTP request.

Defensive priority

HIGH

Recommended defensive actions

  • Update to the latest version of Tenda W20E if available.
  • Limit access to the affected system to trusted users only.
  • Monitor the system for suspicious activity.

Evidence notes

The vulnerability was discovered in Tenda W20E v15.11.0.6.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-36818 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-36818

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

  • CVE-2026-36818 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-36818

    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.