Stack-based Buffer Overflow in Tenda W20E Web Management Interface
CVE-2026-11523

8.7HIGH

Key Information:

Vendor

Tenda
Status
W20e
Vendor
CVE Published:
8 June 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-11523?

A vulnerability exists in the Tenda W20E Web Management Interface within the formPortalAuth function of the /goform/PortalAuth file. This flaw is triggered by improper handling of the gotoUrl argument, which can result in a stack-based buffer overflow. Attackers can exploit this weakness remotely, potentially gaining unauthorized access or causing adverse effects on the device.

Affected Version(s)

W20E 15.11.0.6

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-11523 - Proof of Concept

References

https://vuldb.com/vuln/369143
vdb-entrytechnical-description
https://vuldb.com/vuln/369143/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-11523
third-party-advisory

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

hacker128 (VulDB User)
.