---
id: CVE-2026-112016
title: >-
  Netcore NR256CN through 1.5.140116 Unauthenticated Write to Fixed Boa Staging
  Files
summary: >-
  Netcore NR256CN through 1.5.140116 contains an unauthenticated file write
  vulnerability in the Boa-derived /bin/boa web server that allows remote
  attackers to overwrite update and restore staging files. Attackers can POST to
  a non-existe…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L'
cvssSource: cna
cwe:
  - CWE-306
vendor: Netcore
product: NR256CN
affected:
  - NR256CN <= 1.5.140116
published: '2026-10-18'
updated: '2026-10-18'
sourceUpdated: '2026-10-18T11:38:37.119Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-112016'
references:
  - url: >-
      https://github.com/lukadqq/netcore-router-public-refs/blob/a44d562736b41c944223297e9144d2ad7fa2aff1/2026.10.15-netcore-nr256cn-fixed-tmp-sink-write.md
  - url: >-
      https://www.vulncheck.com/advisories/netcore-nr256cn-through-1.5.140116-unauthenticated-write-to-fixed-boa-staging-files
    label: >-
      VulnCheck Advisory: Netcore NR256CN through 1.5.140116 Unauthenticated
      Write to Fixed Boa Staging Files
tags:
  - cve.org
ingestedAt: '2026-10-18T11:40:26.621Z'
---

## Overview

Netcore NR256CN through 1.5.140116 contains an unauthenticated file write vulnerability in the Boa-derived /bin/boa web server that allows remote attackers to overwrite update and restore staging files. Attackers can POST to a non-existent .cgi pathname to write attacker-controlled content into /tmp/boa_temp.update or /tmp/boa_temp.para, tampering with pending firmware updates or configuration restores or causing denial of service.

## Affected

- `NR256CN <= 1.5.140116`

## Remediation

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