Buffer Overflow Vulnerability in LB-LINK BL-WR9000 Router
CVE-2026-4227

8.7HIGH

Key Information:

Vendor

Lb-link

Status
Bl-wr9000
Vendor
CVE Published:
16 March 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-4227?

A security flaw exists in the LB-LINK BL-WR9000 router, specifically within the sub_44D844 function located in /goform/get_hidessid_cfg. This vulnerability allows for a remote attacker to manipulate the function, leading to a buffer overflow. Such an exploit presents significant risks, as it may allow unauthorized access or control over the router. Despite early notification of the issue, the vendor has not responded to the disclosure, leaving users at potential risk of exploitation.

Affected Version(s)

BL-WR9000 2.4.9

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-2026-4227 - Proof of Concept

References

https://vuldb.com/?id.351150
vdb-entrytechnical-description
https://vuldb.com/?ctiid.351150
signaturepermissions-required
https://vuldb.com/?submit.771209
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

jfkk (VulDB User)
VulDB
.