---
id: CVE-2026-111710
title: Netcore NR256CN through 1.5.140116 Boa Web Server NULL Pointer Dereference DoS
summary: >-
  Netcore NR256CN through 1.5.140116 contains a NULL pointer dereference
  vulnerability in the Boa web server's user_auth() function that allows
  unauthenticated attackers to crash the server via a malformed Authorization
  header. Attackers c…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cvssSource: cna
cwe:
  - CWE-476
vendor: Netcore
product: NR256CN
affected:
  - NR256CN <= 1.5.140116
published: '2026-10-16'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T17:40:00.612Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-111710'
references:
  - url: >-
      https://github.com/lukadqq/netcore-router-public-refs/blob/a44d562736b41c944223297e9144d2ad7fa2aff1/2026.10.15-netcore-nr256cn-basic-auth-null-deref.md
  - url: >-
      https://www.vulncheck.com/advisories/netcore-nr256cn-through-1.5.140116-boa-web-server-null-pointer-dereference-dos
    label: >-
      VulnCheck Advisory: Netcore NR256CN through 1.5.140116 Boa Web Server NULL
      Pointer Dereference DoS
tags:
  - cve.org
ingestedAt: '2026-10-16T18:43:08.641Z'
---

## Overview

Netcore NR256CN through 1.5.140116 contains a NULL pointer dereference vulnerability in the Boa web server's user_auth() function that allows unauthenticated attackers to crash the server via a malformed Authorization header. Attackers can send a Basic Authorization value lacking a colon, such as one decoding to a single character, to protected routes like /router/get_user_type.cgi to kill the main Boa process and deny management interface access.

## Affected

- `NR256CN <= 1.5.140116`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.