Command Injection Vulnerability in Wavlink Wireless Router
CVE-2026-4543

5.3MEDIUM

Key Information:

Vendor

Wavlink

Status
Wl-wn578w2
Vendor
CVE Published:
22 March 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-4543?

A command injection vulnerability exists in the Wavlink WL-WN578W2 router affecting the POST Request Handler located in the /cgi-bin/firewall.cgi file. This vulnerability allows unauthorized remote attackers to manipulate the dmz_flag/del_flag arguments, potentially compromising the device's integrity. Despite early disclosure attempts to inform the vendor, Wavlink has not responded. The exploit is now public, presenting serious risks to users with this device version.

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Affected Version(s)

WL-WN578W2 221110

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-2026-4543 - Proof of Concept

References

https://vuldb.com/?id.352360
vdb-entrytechnical-description
https://vuldb.com/?ctiid.352360
signaturepermissions-required
https://vuldb.com/?submit.774690
third-party-advisory

CVSS V4

Score:
5.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
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

LtzHuster (VulDB User)
VulDB
JSON
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