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

Who should care

Administrators and users of Tenda W20E v15.11.0.6 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.

Official resources

CVE-2026-36820 was published on 2026-06-09T19:17:47.703Z and last modified on 2026-06-09T21:17:11.203Z.