PatchSiren cyber security CVE debrief

CVE-2026-36819 Shenzhen Tenda Technology Co., Ltd CVE debrief

CVE-2026-36819 is a HIGH severity vulnerability in Shenzhen Tenda Technology Co., Ltd Tenda W20E v15.11.0.6. The vulnerability is caused by a buffer overflow in the bindMACAddr parameter of the fromSetDhcpRules function. This allows attackers to cause a Denial of Service (DoS) via a crafted HTTP request. The vulnerability has a CVSS score of 7.5 and was published on [cvePublishedAt](https://www.cve.org/CVERecord?id=CVE-2026-36819).

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: 2026-06-09
Advisory published: 2026-06-09
Advisory updated: 2026-06-09

Who should care

Administrators and users of Shenzhen Tenda Technology Co., Ltd Tenda W20E v15.11.0.6 should be aware of this vulnerability and take necessary actions to mitigate it.

Technical summary

The vulnerability is caused by a buffer overflow in the bindMACAddr parameter of the fromSetDhcpRules function in Shenzhen Tenda Technology Co., Ltd Tenda W20E v15.11.0.6. 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 to prevent unauthorized access.
Monitor network traffic for suspicious activity.

Evidence notes

The vulnerability was discovered in Shenzhen Tenda Technology Co., Ltd Tenda W20E v15.11.0.6 and has a CVSS score of 7.5.

Official resources

CVE-2026-36819 was published on [cvePublishedAt](https://www.cve.org/CVERecord?id=CVE-2026-36819) and modified on [cveModifiedAt](https://nvd.nist.gov/vuln/detail/CVE-2026-36819).