Stack-Based Buffer Overflow in Tenda W20E QoS Rule Deletion Function
CVE-2026-19823

8.7HIGH

Key Information:

Vendor

Tenda
Status
W20e
Vendor
CVE Published:
14 August 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-19823?

A security vulnerability has been identified in the Tenda W20E router that affects the QoS Rule Deletion feature. The issue resides within the formQOSRuleDel function located in the /goform/delQos file. An attacker can exploit this flaw by manipulating the qosIndex argument, leading to a stack-based buffer overflow. This vulnerability could be exploited remotely, making it a critical concern for users of the affected version. As the exploit has been released to the public, it emphasizes the importance of prompt remediation.

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-2026-19823 - Proof of Concept

References

https://vuldb.com/vuln/389956
vdb-entrytechnical-description
https://vuldb.com/vuln/389956/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-19823
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)
.