# CVE-2026-94100: Netcore NBR200V2 buffer overflow in WAN VLAN configuration

Source: https://junglewise.ai/threats/cve-2026-94100-a-weakness-has-been-identified-in-netcore-nbr200v2-1-3-241127  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-21. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-94100 · Severity: critical · CVSS 9.9 · Published 2026-09-21

Netcore NBR200V2 is a network router used in enterprise deployments. A buffer overflow vulnerability in the WAN VLAN configuration function allows remote attackers to execute arbitrary code or crash the device by sending specially crafted network requests, potentially leading to complete device compromise or denial of service.

Technologies: [Netcore NBR200V2](https://junglewise.ai/threats/technologies/nbr200v2). Vendors: [Netcore](https://junglewise.ai/threats/vendors/netcore).

## Quick answers

**Is CVE-2026-94100 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-94100 being exploited in the wild.

**How severe is CVE-2026-94100?** Critical severity, with a CVSS score of 9.9, published 21 September 2026.

**Which products and versions are affected?** Netcore NBR200V2 1.3.241127.071246.

**Is there a fix for CVE-2026-94100?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-94100 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-94100?** Check whether you run Netcore NBR200V2 at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A buffer overflow exists in the wan_config_set_vlan function within /usr/bin/routerd when processing the vlan_wanX.ports argument. The vulnerability is remotely exploitable without authentication and allows unauthenticated network-based attackers to cause memory corruption, leading to arbitrary code execution or denial of service. Public exploit code is available.

## Affected products

- Netcore NBR200V2 1.3.241127.071246

## Timeline

- 2026-09-21: disclosed
- other: Public exploit available

## References

- [https://app.notion.com/p/Netcore-NBR200V2-Vul-8-39f797159f158003ad3eff2fd36342b6](https://app.notion.com/p/Netcore-NBR200V2-Vul-8-39f797159f158003ad3eff2fd36342b6)
- [https://vuldb.com/cve/CVE-2026-94100](https://vuldb.com/cve/CVE-2026-94100)

## Related threats

- [Netcore NBR200V2 authenticated command injection in Tools Ping](https://junglewise.ai/threats/cve-2026-101002-a-security-flaw-has-been-discovered-in-netcore-nbr200v2-1-3)
- [Netcore NBR200V2 command injection in network_tools](https://junglewise.ai/threats/cve-2026-101001-a-vulnerability-was-identified-in-netcore-nbr200v2-1-3-241127)
- [Netcore NBR200V2 buffer overflow in routerd VLAN handler](https://junglewise.ai/threats/cve-2026-94101-a-security-vulnerability-has-been-detected-in-netcore-nbr200v2-1)
- [Netcore NBR200V2 command injection in restore.cgi](https://junglewise.ai/threats/cve-2026-94099-a-security-flaw-has-been-discovered-in-netcore-nbr200v2-1-3)
- [Netcore NBR200V2 command injection in firmware upgrade endpoint](https://junglewise.ai/threats/cve-2026-94098-a-vulnerability-was-identified-in-netcore-nbr200v2-1-3-241127)