Buffer Overflow Vulnerability in Netcore NBR200V2 Router
CVE-2026-94100

9.4CRITICAL

Key Information:

Vendor

Netcore

Status
Nbr200v2
Vendor
CVE Published:
21 September 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-94100?

A vulnerability exists in the Netcore NBR200V2 router related to WAN VLAN reconfiguration, specifically within the function wan_config_set_vlan located in the /usr/bin/routerd file. This flaw stems from improper handling of input for the vlan_wanX.ports argument, allowing a remote attacker to manipulate this parameter and potentially cause a buffer overflow. Publicly available exploit code for this vulnerability exacerbates the risk, highlighting the necessity for immediate remediation. Despite being alerted about this issue, the vendor has not provided any response or patch.

Affected Version(s)

NBR200V2 1.3.241127.071246

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-2026-94100 - Proof of Concept

References

https://vuldb.com/vuln/408029
vdb-entrytechnical-description
https://vuldb.com/vuln/408029/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-94100
third-party-advisory

CVSS V4

Score:
9.4
Severity:
CRITICAL
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

FirmHarness (VulDB User)
VulDB CNA Team
.