Stack-based Buffer Overflow in Tenda CX12L Router
CVE-2026-8138

8.7HIGH

Key Information:

Vendor

Tenda
Status
Cx12l
Vendor
CVE Published:
8 May 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-8138?

A stack-based buffer overflow vulnerability exists in the Tenda CX12L router, specifically in the formSetPPTPServer function of the /goform/SetPptpServerCfg file. This flaw allows an attacker to manipulate the affected system remotely, potentially leading to unauthorized access and exploitation of sensitive information. As the vulnerabilities have been publicly disclosed, it is crucial for users to apply necessary patches and updates to safeguard their devices against potential threats.

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-2026-8138 - Proof of Concept

References

https://vuldb.com/vuln/361927
vdb-entrytechnical-description
https://vuldb.com/vuln/361927/cti
signaturepermissions-required
https://vuldb.com/submit/808867
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)
.