---
id: CVE-2020-25367
title: >-
  A command injection vulnerability was discovered in the HNAP1 protocol in
  D-Link DIR-823G devices with firmware V1.0.2B05
summary: >-
  A command injection vulnerability was discovered in the HNAP1 protocol in
  D-Link DIR-823G devices with firmware V1.0.2B05. An attacker is able to
  execute arbitrary web scripts via shell metacharacters in the Captcha field to
  Login.
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-78
vendor: dlink
product: dir-823g_firmware
affected:
  - dir-823g_firmware = 1.0.2b05
published: '2021-11-04'
updated: '2026-07-05'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2020-25367'
references:
  - url: 'https://github.com/sek1th/iot/blob/master/dir823g_3.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_3.md'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://www.dlink.com/en/security-bulletin/'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.08649
epssPercentile: 0.94927
ingestedAt: '2026-07-06T17:03:23.610Z'
---

## Overview

A command injection vulnerability was discovered in the HNAP1 protocol in D-Link DIR-823G devices with firmware V1.0.2B05. An attacker is able to execute arbitrary web scripts via shell metacharacters in the Captcha field to Login.

## Affected

- `dir-823g_firmware = 1.0.2b05`

## Remediation

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