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PatchSiren cyber security CVE debrief

CVE-2026-36820 Shenzhen Tenda Technology Co., Ltd CVE debrief

A buffer overflow vulnerability was discovered in the webAuthWhiteUserInfo parameter of the formAddWebAuthWhiteUser function in Tenda W20E v15.11.0.6. 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 [cvePublishedAt] and last modified on [cveModifiedAt].

Vendor
Shenzhen Tenda Technology Co., Ltd
Product
W20E
CVSS
HIGH 7.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-09
Original CVE updated
2026-07-20
Advisory published
2026-06-09
Advisory updated
2026-07-20

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 webAuthWhiteUserInfo parameter of the formAddWebAuthWhiteUser 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 discovered in Tenda W20E v15.11.0.6 and has a CVSS score of 7.5, indicating a HIGH severity level.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-36820 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-36820

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

  • CVE-2026-36820 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-36820

    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.