---
id: CVE-2021-45420
title: >-
  Emerson Dixell XWEB-500 products are affected by arbitrary file write
  vulnerability in /cgi-bin/logo_extra_upload.cgi, /cgi-bin/cal_save.cgi, and
  /cgi-bin/lo_utils.cgi
summary: >-
  Emerson Dixell XWEB-500 products are affected by arbitrary file write
  vulnerability in /cgi-bin/logo_extra_upload.cgi, /cgi-bin/cal_save.cgi, and
  /cgi-bin/lo_utils.cgi. An attacker will be able to write any file on the
  target system with…
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-200
  - CWE-306
  - CWE-668
vendor: emerson
product: dixell_xweb-500_firmware
affected:
  - dixell_xweb-500_firmware
published: '2022-02-14'
updated: '2026-07-05'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2021-45420'
references:
  - url: 'https://www.swascan.com/emerson'
    label: cve@mitre.org
  - url: 'http://dixell.com'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'http://emerson.com'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://www.swascan.com/emerson'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
  - exploit-available
epss: 0.1755
epssPercentile: 0.97035
ingestedAt: '2026-07-06T02:09:23.207Z'
exploits:
  nuclei:
    - CVE-2021-45420
  checkedAt: '2026-09-26T09:05:27.699Z'
exploitAvailable: true
---

## Overview

Emerson Dixell XWEB-500 products are affected by arbitrary file write vulnerability in /cgi-bin/logo_extra_upload.cgi, /cgi-bin/cal_save.cgi, and /cgi-bin/lo_utils.cgi. An attacker will be able to write any file on the target system without any kind of authentication mechanism, and this can lead to denial of service and potentially remote code execution. Note: the product has not been supported since 2018 and should be removed or replaced.

## Affected

- `dixell_xweb-500_firmware`

## Remediation

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