PatchSiren cyber security CVE debrief

CVE-2026-36823 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 webAuthUserInfo parameter of the formAddWebAuthUser 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: 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 Tenda W20E v15.11.0.6 are advised to take necessary precautions to mitigate this vulnerability.

Technical summary

The vulnerability is caused by a buffer overflow in the webAuthUserInfo parameter of the formAddWebAuthUser function. This allows attackers to send crafted HTTP requests that can cause a Denial of Service (DoS).

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 and reported by an unknown source. The CVE record was published on [resourceLinkAnnotations:cve-org].

Official resources

CVE-2026-36823 was published on [cvePublishedAt:2026-06-09T19:17:48.070Z].