CVE-2020-25366 Missing authorization in n/a

Critical 9.1 Published 4 Nov 2021 Updated 9 Jul 2026

Attackers can cause a denial of service on D-Link DIR-823G routers via the firmware upload CGI script due to missing authorization checks.

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-2020-25366?

CVE-2020-25366 is a critical missing authorization 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

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.

Weakness: CWE-862

Which versions are affected by CVE-2020-25366?

It affects 1 product.

Products include Dlink Dir-823g Firmware.

How do I fix CVE-2020-25366?

No fix has been published for CVE-2020-25366 yet. Limit exposure of the affected software until one is available.

Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.

Is CVE-2020-25366 being exploited?

There is no known exploitation of CVE-2020-25366 in the wild and no public exploit code.

All Dlink Dir-823g Firmware vulnerabilities

Sources

Also known as GHSA-rpw2-pg2j-mxph.