Remote Stack-Based Overflow in Tenda W20E via QoS Edit Function
CVE-2026-19822

8.7HIGH

Key Information:

Vendor

Tenda
Status
W20e
Vendor
CVE Published:
14 August 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-19822?

A security issue was identified in the Tenda W20E router that affects the QoS Edit functionality. Specifically, the vulnerability resides in the lstAdd function located in the /goform/editQos file, allowing for a stack-based buffer overflow due to improper handling of the qosListConnecttedNum argument. This vulnerability can be exploited remotely, exposing devices to potential unauthorized access. Publicly available exploits may be used to take advantage of this weakness, making it crucial for users to ensure their firmware is updated to the latest version.

Affected Version(s)

W20E 15.11.0.6(1068_1546_841)_CN_TDC

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-2026-19822 - Proof of Concept

References

https://vuldb.com/vuln/389955
vdb-entrytechnical-description
https://vuldb.com/vuln/389955/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-19822
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

paxiot (VulDB User)
.