Buffer Overflow Vulnerability in Edimax BR-6478AC Router
CVE-2026-9443

8.7HIGH

Key Information:

Vendor

Edimax

Status
Br-6478ac
Vendor
CVE Published:
25 May 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-9443?

A security vulnerability identified in the Edimax BR-6478AC router version 1.23 relates to the function formL2TPSetup in the /goform/formL2TPSetup file. Specifically, an attacker can manipulate the L2TPUserName argument, leading to a buffer overflow condition. This vulnerability can be exploited remotely, potentially allowing unauthenticated attackers to execute arbitrary code. Despite early notification regarding this issue, there has been no response from Edimax, raising concerns about user security. Given the public disclosure of this exploit, users should take immediate action to review their router's security settings and mitigate potential risks.

Affected Version(s)

BR-6478AC 1.23

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-2026-9443 - Proof of Concept

References

https://vuldb.com/vuln/365424
vdb-entrytechnical-description
https://vuldb.com/vuln/365424/cti
signaturepermissions-required
https://vuldb.com/submit/818452
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

wxhwxhwxh_mie (VulDB User)
VulDB CNA Team
.