CVE-2020-25367 Command injection in n/a

Critical 9.8 Published 4 Nov 2021 Updated 9 Jul 2026

Attackers can execute arbitrary commands on D-Link DIR-823G routers via shell metacharacters in the Captcha field of the HNAP1 Login protocol.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2020-25367?

CVE-2020-25367 is a critical command injection vulnerability in Dlink Dir-823g Firmware, published on 4 Nov 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

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.

Weakness: CWE-78

Which versions are affected by CVE-2020-25367?

It affects 1 product.

Products include Dlink Dir-823g Firmware.

How do I fix CVE-2020-25367?

No fix has been published for CVE-2020-25367 yet. Limit exposure of the affected software until one is available.

Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.

Is CVE-2020-25367 being exploited?

There is no known exploitation of CVE-2020-25367 in the wild and no public exploit code.

All Dlink Dir-823g Firmware vulnerabilities

Sources

Also known as GHSA-896v-rq93-x779.