---
id: CVE-2020-25366
title: >-
  An issue in the component /cgi-bin/upload_firmware.cgi of D-Link DIR-823G
  REVA1 1.02B05 allows attackers to cause a denial of service (DoS) via
  unspecified vectors.
summary: >-
  An issue in the component /cgi-bin/upload_firmware.cgi of D-Link DIR-823G
  REVA1 1.02B05 allows attackers to cause a denial of service (DoS) via
  unspecified vectors.
severity: critical
cvss: 9.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H'
cwe:
  - CWE-862
vendor: dlink
product: dir-823g_firmware
affected:
  - dir-823g_firmware = 1.02b05
published: '2021-11-04'
updated: '2026-07-05'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2020-25366'
references:
  - url: 'https://github.com/sek1th/iot/blob/master/dir823g_upfw_dos.md'
    label: cve@mitre.org
  - url: 'https://www.dlink.com/en/security-bulletin/'
    label: cve@mitre.org
  - url: 'http://d-link.com'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://github.com/sek1th/iot/blob/master/dir823g_upfw_dos.md'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://www.dlink.com/en/security-bulletin/'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.0246
epssPercentile: 0.83733
ingestedAt: '2026-07-06T17:03:23.612Z'
---

## Overview

An issue in the component /cgi-bin/upload_firmware.cgi of D-Link DIR-823G REVA1 1.02B05 allows attackers to cause a denial of service (DoS) via unspecified vectors.

## Affected

- `dir-823g_firmware = 1.02b05`

## Remediation

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