CVE-2026-94100Public exploitNetwork attack vector

Authenticated device compromise via VLAN port overflow

Published Sep 21, 2026 · Updated Sep 21, 2026

Buffer overflow in Netcore NBR200V2 1.3.241127.071246 allows remote authenticated users to compromise the router via WAN VLAN settings. The wan_config_set_vlan function in /usr/bin/routerd copies the vlan_wanX.ports value into a destination buffer without verifying that it fits. Low-privilege authenticated network access is required; successful corruption exposes router data, configuration integrity, and service availability.

CVSS severity9.9
Critical
EPSS probability0.80%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in Netcore NBR200V2 1.3.241127.071246 allows remote authenticated users to compromise the router via WAN VLAN settings. The wan_config_set_vlan function in /usr/bin/routerd copies the vlan_wanX.ports value into a destination buffer without verifying that it fits. Low-privilege authenticated network access is required; successful corruption exposes router data, configuration integrity, and service availability.

The record

CVE
CVE-2026-94100
Published
Sep 21, 2026
Updated
Sep 21, 2026
Vendor
Chengdu Feiyuxing Technology Co., Ltd.
Product
NBR200V2
Classifications
CWE-119, CWE-120, T1210
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 21, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 21, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.3.241127.071246

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Chengdu Feiyuxing Technology Co., Ltd. · NBR200V2version=1.3.241127.071246

Published CVSS scores

9.0VulDB CNAAV:N/AC:L/Au:S/C:C/I:C/A:C
8.6VulDB CNACVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
9.9VulDB CNACVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1210Exploitation of Remote Services

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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