# CVE-2020-3968: Memory corruption in Fusion

> A local attacker with admin privileges in a VM can exploit an out-of-bounds write in the USB controller to crash the VM or execute code on the hypervisor.

- **Severity:** High 8.2 (`CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 25 Jun 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-h4rr-vfvf-xcpv

## What is CVE-2020-3968?

CVE-2020-3968 is a high-severity memory corruption vulnerability in Vmware Cloud Foundation, published on 25 Jun 2020. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

VMware ESXi (7.0 before ESXi_7.0.0-1.20.16321839, 6.7 before ESXi670-202004101-SG and 6.5 before ESXi650-202005401-SG), Workstation (15.x before 15.5.5), and Fusion (11.x before 11.5.5) contain an out-of-bounds write vulnerability in the USB 3.0 controller (xHCI). A malicious actor with local administrative privileges on a virtual machine may be able to exploit this issue to crash the virtual machine's vmx process leading to a denial of service condition or execute code on the hypervisor from a virtual machine. Additional conditions beyond the attacker's control must be present for exploitation to be possible.

Weakness: CWE-787 (Out-of-bounds Write)

## Which versions are affected by CVE-2020-3968?

It affects 4 products.


Products: Vmware Cloud Foundation, Vmware Esxi, Vmware Fusion, Vmware Workstation.

## How do I fix CVE-2020-3968?

No fix has been published for CVE-2020-3968 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-3968 being exploited?

There is no known exploitation of CVE-2020-3968 in the wild and no public exploit code.

## Other vulnerabilities in Vmware Cloud Foundation

- [CVE-2024-38812](https://insights.sbomify.com/CVE-2024-38812/): VMware vCenter Server Heap-Based Buffer Overflow (critical 9.8, exploited in the wild)
- [CVE-2024-37079](https://insights.sbomify.com/CVE-2024-37079/): Broadcom VMware vCenter Server Out-of-bounds Write (critical 9.8, exploited in the wild)
- [CVE-2022-22954](https://insights.sbomify.com/CVE-2022-22954/): VMware Workspace ONE Access and Identity Manager Server-Side Template Injection (critical 9.8, exploited in the wild)
- [CVE-2021-22005](https://insights.sbomify.com/CVE-2021-22005/): VMware vCenter Server File Upload (critical 9.8, exploited in the wild)
- [CVE-2021-21985](https://insights.sbomify.com/CVE-2021-21985/): VMware vCenter Server Improper Input Validation (critical 9.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-3968 and fix it if it is affected.

What it is: CVE-2020-3968 is a high-severity memory corruption vulnerability in Vmware Cloud Foundation, published on 25 Jun 2020. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2020-3968 in the wild and no public exploit code.

Affected product: Vmware Cloud Foundation. 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-2020-3968/ (Markdown: https://insights.sbomify.com/CVE-2020-3968/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-3968
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-3968
- OSV: https://osv.dev/vulnerability/CVE-2020-3968

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-3968/
Summaries are generated and may contain mistakes; the official description above is the record.