---
id: CVE-2021-47814
title: >-
  NBMonitor 1.6.8 contains a denial of service vulnerability that allows
  attackers to crash the application by overflowing the registration code input
  field
summary: >-
  NBMonitor 1.6.8 contains a denial of service vulnerability that allows
  attackers to crash the application by overflowing the registration code input
  field. Attackers can paste a 256-character buffer into the registration key
  field to tri…
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'
cwe:
  - CWE-120
vendor: nsasoft
product: nbmonitor
affected:
  - nbmonitor = 1.6.8
published: '2026-01-16'
updated: '2026-06-29'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2021-47814'
references:
  - url: 'http://www.nsauditor.com'
    label: disclosure@vulncheck.com
  - url: 'https://www.exploit-db.com/exploits/49964'
    label: disclosure@vulncheck.com
  - url: 'https://www.vulncheck.com/advisories/nbmonitor-denial-of-service-poc'
    label: disclosure@vulncheck.com
tags:
  - nvd
epss: 0.00422
epssPercentile: 0.339
ingestedAt: '2026-06-29T21:48:47.227Z'
---

## Overview

NBMonitor 1.6.8 contains a denial of service vulnerability that allows attackers to crash the application by overflowing the registration code input field. Attackers can paste a 256-character buffer into the registration key field to trigger an application crash and potential system instability.

## Affected

- `nbmonitor = 1.6.8`

## Remediation

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