# CVE-2021-40424: Denial of service in Secure Anywhere

> 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.

- **Severity:** High 7.1 (`CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 14 Apr 2022
- **Updated:** 15 Apr 2025
- **Also known as:** GHSA-j39p-f25v-p5gj

## 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 (Out-of-bounds Read)

## Which versions are affected by CVE-2021-40424?

It affects 1 product.


Products: 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.

## Is CVE-2021-40424 being exploited?

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

## Other vulnerabilities in Webroot Secure Anywhere

- [CVE-2018-16962](https://insights.sbomify.com/CVE-2018-16962/): Privilege escalation in n/a (high 7.8)
- [CVE-2021-40425](https://insights.sbomify.com/CVE-2021-40425/): Denial of service in Secure Anywhere (high 7.1)
- [CVE-2023-29818](https://insights.sbomify.com/CVE-2023-29818/): Security feature bypass in n/a (medium 5.5)
- [CVE-2023-29819](https://insights.sbomify.com/CVE-2023-29819/): Security feature bypass in n/a (medium 5.5)
- [CVE-2023-29820](https://insights.sbomify.com/CVE-2023-29820/): Information disclosure in n/a (medium 5.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-40424 and fix it if it is affected.

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

Affected product: Webroot Secure Anywhere. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2021-40424/ (Markdown: https://insights.sbomify.com/CVE-2021-40424/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-40424
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-40424
- OSV: https://osv.dev/vulnerability/CVE-2021-40424

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-40424/
Summaries are generated and may contain mistakes; the official description above is the record.