CVE-2021-27249 Command injection in DAP-2020

High 8.8 Published 14 Apr 2021 Updated 3 Aug 2024

Network-adjacent attackers can execute arbitrary code as root on D-Link DAP-2020 access points via unvalidated input in CGI scripts.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Local or same network only
Victim action needed: Not needed
Fix: None listed

What is CVE-2021-27249?

CVE-2021-27249 is a high-severity command injection vulnerability in D-Link DAP-2020, published on 14 Apr 2021. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of D-Link DAP-2020 v1.01rc001 Wi-Fi access points. Authentication is not required to exploit this vulnerability. The specific flaw exists within the processing of CGI scripts. The issue results from the lack of proper validation of a user-supplied string before using it to execute a system call. An attacker can leverage this vulnerability to execute code in the context of root. Was ZDI-CAN-11369.

Weakness: CWE-78

Which versions are affected by CVE-2021-27249?

It affects 1 product.

Products include Dlink Dap-2020 Firmware.

How do I fix CVE-2021-27249?

No fix has been published for CVE-2021-27249 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-2021-27249 being exploited?

There is no known exploitation of CVE-2021-27249 in the wild and no public exploit code.

Sources

Also known as GHSA-q7xv-685x-6h27.