Security readout for executives and security teams
Plain-English summary
CVE-2020-4004 is a VMware virtualization flaw that could let an administrator inside a guest VM run code in the host-side VMX process. That makes it important for environments where VMs are administered by different teams, tenants, or less-trusted users.
Executive priority
Prioritize remediation where VMware hosts run shared, delegated, or externally administered VMs. The business concern is guest-to-host impact, but the required guest local administrator access limits broad remote exposure.
Technical view
Affected VMware ESXi, Workstation, and Fusion versions contain a use-after-free vulnerability in the XHCI USB controller. A malicious actor with local administrative privileges on a virtual machine may execute code as the VMX process running on the host.
Likely exposure
Exposure is most likely on ESXi hosts, Workstation systems, or Fusion systems running the listed vulnerable versions, especially where guest VM administrators are not fully trusted.
Exploitation context
The provided sources do not show CISA KEV listing or active exploitation. Exploitation requires local administrative privileges inside a virtual machine and targets host-side VMX execution context.
Researcher notes
The source bundle provides affected versions and vulnerability class but no CVSS vector, CWE, proof-of-concept status, or exploitation telemetry. Treat impact analysis as based on the stated VMX host process code execution outcome.
Mitigation direction
- Upgrade ESXi 7.0 to ESXi70U1b-17168206 or later.
- Upgrade ESXi 6.7 to ESXi670-202011101-SG or later.
- Upgrade ESXi 6.5 to ESXi650-202011301-SG or later.
- Upgrade Workstation 15.x to 15.5.7 or later.
- Upgrade Fusion 11.x to 11.5.7 or later.
- Review VMware advisory VMSA-2020-0026 for vendor guidance.
Validation and detection
- Inventory VMware ESXi, Workstation, and Fusion versions.
- Compare installed versions against the fixed versions listed for CVE-2020-4004.
- Identify hosts running VMs administered by less-trusted users or tenants.
- Confirm patch status through VMware lifecycle or vulnerability management records.
- Check whether XHCI USB controller exposure is relevant in affected VM configurations.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2020-4004 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://www.vmware.com/security/advisories/VMSA-2020-0026.htmlCVE reference · x_refsource_CONFIRM
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.