CVE-2021-41653 Command injection in n/a

Critical 9.8 Published 13 Nov 2021 Updated 9 Jul 2026

Remote attackers can execute arbitrary code on TP-Link TL-WR840N routers by sending a crafted payload to the PING function.

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-2021-41653?

CVE-2021-41653 is a critical command injection vulnerability in n/a, published on 13 Nov 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

The PING function on the TP-Link TL-WR840N EU v5 router with firmware through TL-WR840N(EU)_V5_171211 is vulnerable to remote code execution via a crafted payload in an IP address input field.

Weakness: CWE-94

Which versions are affected by CVE-2021-41653?

It affects 1 product.

Products include Tp-Link Tl-Wr840n Firmware.

How do I fix CVE-2021-41653?

No fix has been published for CVE-2021-41653 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-2021-41653 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-41653 exists.

Public exploit code: 1 Nuclei template and 1 proofs of concept on GitHub.

Sources

Also known as GHSA-8fx7-hx38-cm88.