Stack-Based Buffer Overflow in Tenda A18 Pro Wi-Fi Router
CVE-2026-4489

8.7HIGH

Key Information:

Vendor

Tenda
Status
A18 Pro
Vendor
CVE Published:
20 March 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-4489?

A vulnerability exists in the Tenda A18 Pro routers due to improper handling of the form_fast_setting_wifi_set function in the /goform/fast_setting_wifi_set file. This flaw allows attackers to execute a stack-based buffer overflow remotely, leading to potential unauthorized access or control over the affected device. Awareness of this vulnerability is critical, particularly since the exploit details have become publicly available.

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Deploy the Patch

Affected Version(s)

A18 Pro 02.03.02.28

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-2026-4489 - Proof of Concept

References

https://vuldb.com/?id.352015
vdb-entrytechnical-description
https://vuldb.com/?ctiid.352015
signaturepermissions-required
https://vuldb.com/?submit.773619
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

lilukun (VulDB User)
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