CVE-2021-20709 Command injection in NEC Aterm devices

High 7.2 Published 26 Apr 2021 Updated 3 Aug 2024

An attacker with administrative privileges can execute arbitrary OS commands on NEC Aterm routers by sending a specially crafted request.

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

What is CVE-2021-20709?

CVE-2021-20709 is a high-severity command injection vulnerability in NEC Aterm devices, published on 26 Apr 2021. An attacker needs administrator access to exploit it, with no action from the victim.

Official description

Improper validation of integrity check value vulnerability in NEC Aterm WF1200CR firmware Ver1.3.2 and earlier, Aterm WG1200CR firmware Ver1.3.3 and earlier, and Aterm WG2600HS firmware Ver1.5.1 and earlier allows an attacker with an administrative privilege to execute arbitrary OS commands by sending a specially crafted request to a specific URL.

Weakness: CWE-354

Which versions are affected by CVE-2021-20709?

It affects 3 products.

Products include Nec Aterm Wf1200cr Firmware, Nec Aterm Wg1200cr Firmware, Nec Aterm Wg2600hs Firmware.

How do I fix CVE-2021-20709?

No fix has been published for CVE-2021-20709 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-2021-20709 being exploited?

There is no known exploitation of CVE-2021-20709 in the wild and no public exploit code.

Sources

Also known as GHSA-fr48-wfw6-fwg7.