CVE-2021-40424 Denial of service in Secure Anywhere

High 7.1 Published 14 Apr 2022 Updated 15 Apr 2025

A local attacker can trigger a denial of service in Webroot Secure Anywhere via a specially crafted executable exploiting an out-of-bounds read in the device driver.

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-2021-40424?

CVE-2021-40424 is a high-severity denial of service vulnerability in Webroot Secure Anywhere, published on 14 Apr 2022. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

An out-of-bounds read vulnerability exists in the IOCTL GetProcessCommand and B_03 of Webroot Secure Anywhere 21.4. A specially-crafted executable can lead to denial of service. An attacker can issue an ioctl to trigger this vulnerability. An out-of-bounds read vulnerability exists in the IOCTL GetProcessCommand and B_03 of Webroot Secure Anywhere 21.4. The GetProcessCommandLine IOCTL request could cause an out-of-bounds read in the device driver WRCore_x64. An attacker can issue an ioctl to trigger this vulnerability.

Weakness: CWE-125

Which versions are affected by CVE-2021-40424?

It affects 1 product.

Products include Webroot Secureanywhere.

How do I fix CVE-2021-40424?

No fix has been published for CVE-2021-40424 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-2021-40424 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-40424 exists.

Sources

Also known as GHSA-j39p-f25v-p5gj.