Buffer Overflow Vulnerability in Tenda CX12L Router
CVE-2026-5687

8.7HIGH

Key Information:

Vendor

Tenda
Status
Cx12l
Vendor
CVE Published:
6 April 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-5687?

A vulnerability exists in the Tenda CX12L router, specifically within the fromNatStaticSetting function located in the /goform/NatStaticSetting file. This weakness allows an attacker to execute a stack-based buffer overflow by manipulating input arguments. The vulnerability can be exploited remotely, potentially compromising the device's security. Since the exploit has been publicly disclosed, users of the affected version should take immediate precautions to secure their systems.

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-2026-5687 - Proof of Concept

References

https://vuldb.com/vuln/355514
vdb-entrytechnical-description
https://vuldb.com/vuln/355514/cti
signaturepermissions-required
https://vuldb.com/submit/792785
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)
.