CVE-2021-45740 Denial of service in n/a

Critical 9.8 Published 4 Feb 2022 Updated 4 Aug 2024

Attackers can cause a Denial of Service on TOTOLINK A720R routers via a stack overflow in the setWiFiWpsStart 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-2021-45740?

CVE-2021-45740 is a critical denial of service vulnerability in n/a, published on 4 Feb 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

TOTOLINK A720R v4.1.5cu.470_B20200911 was discovered to contain a stack overflow in the setWiFiWpsStart function. This vulnerability allows attackers to cause a Denial of Service (DoS) via the pin parameter.

Which versions are affected by CVE-2021-45740?

It affects 1 product.

Products include Totolink A720r Firmware.

How do I fix CVE-2021-45740?

No fix has been published for CVE-2021-45740 yet. Limit exposure of the affected software until one is available.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2021-45740 being exploited?

There is no known exploitation of CVE-2021-45740 in the wild and no public exploit code.

Sources

Also known as GHSA-6c2j-x443-7jc3.