Stack-based Buffer Overflow in Tenda A18 Pro MAC Filtering Configuration
CVE-2026-4493

8.7HIGH

Key Information:

Vendor

Tenda
Status
A18 Pro
Vendor
CVE Published:
20 March 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-4493?

A vulnerability exists in the Tenda A18 Pro router, specifically within the MAC Filtering Configuration Endpoint. The flaw is located in the function sub_423B50 of the /goform/setMacFilterCfg file, where improper handling of the deviceList argument can lead to a stack-based buffer overflow. This vulnerability is exploitable remotely and has been publicly disclosed, making affected devices susceptible to malicious exploits.

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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-2026-4493 - Proof of Concept

References

https://vuldb.com/?id.352019
vdb-entrytechnical-description
https://vuldb.com/?ctiid.352019
signaturepermissions-required
https://vuldb.com/?submit.773727
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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