Stack-Based Buffer Overflow in Tenda CX12L Router
CVE-2026-5686

8.7HIGH

Key Information:

Vendor

Tenda
Status
Cx12l
Vendor
CVE Published:
6 April 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-5686?

A security vulnerability has been identified in the Tenda CX12L router's handling of the RouteStatic function, specifically affecting the /goform/RouteStatic file. An attacker can exploit this flaw by manipulating the 'page' argument, leading to a stack-based buffer overflow. The nature of this vulnerability allows remote exploitation, posing significant security risks. The details of the exploit have been made public, increasing the urgency for affected users to implement necessary mitigations.

Affected Version(s)

CX12L 16.03.53.12

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-2026-5686 - Proof of Concept

References

https://vuldb.com/vuln/355513
vdb-entrytechnical-description
https://vuldb.com/vuln/355513/cti
signaturepermissions-required
https://vuldb.com/submit/792783
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

lv1020 (VulDB User)
.