Stack-based Buffer Overflow in Tenda A18 Pro Router
CVE-2026-4490

8.7HIGH

Key Information:

Vendor

Tenda
Status
A18 Pro
Vendor
CVE Published:
20 March 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-4490?

A critical flaw exists in the Tenda A18 Pro router's setSchedWifi function, found in the /goform/openSchedWifi file. This vulnerability allows for a stack-based buffer overflow, enabling potential remote exploitation. Attackers may manipulate this function to execute arbitrary code, leading to unauthorized access and control over the device. As this exploit has been publicly disclosed, it poses a significant risk to users who have not applied necessary security measures or updates.

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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-2026-4490 - Proof of Concept

References

https://vuldb.com/?id.352016
vdb-entrytechnical-description
https://vuldb.com/?ctiid.352016
signaturepermissions-required
https://vuldb.com/?submit.773670
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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