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.

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)
.