PatchSiren cyber security CVE debrief

CVE-2026-36821 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 picCropName parameter of the formCropAndSetWewifiPic function. This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted HTTP request. The vulnerability has a CVSS score of 7.5 and a severity of HIGH.

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

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 a buffer overflow in the picCropName parameter of the formCropAndSetWewifiPic function in Shenzhen Tenda Technology Co., Ltd Tenda W20E v15.11.0.6. This can be exploited by sending a crafted HTTP request, potentially leading to a Denial of Service (DoS).

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 exploitation.
Monitor network traffic for suspicious activity.

Evidence notes

The vulnerability was discovered in Shenzhen Tenda Technology Co., Ltd Tenda W20E v15.11.0.6. The CVE record can be found at [cve-org]. More details are available at [nvd].

Official resources

CVE-2026-36821 was published on 2026-06-09T19:17:47.817Z and modified on 2026-06-09T21:17:11.353Z.