CVE-2021-30481
Valve Steam before 2021-04-17, when a Source engine game is installed, allows remote authenticated users to execute arbitrary code because of a buffer...
- Published
- Apr 10, 2021
- Updated
- Nov 3, 2025
- Assigning CNA
- mitre
- Evidence observed
- Aug 8, 2026
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:HLow · next 30 days
- Percentile
- 88.7%
- Model date
- Sep 21, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
Summary
Valve Steam before 2021-04-17, when a Source engine game is installed, allows remote authenticated users to execute arbitrary code because of a buffer overflow that occurs for a Steam invite after one click.
Sources
1- CVE-2021-30481Exploit
Exploit code for CVE-2021-30481 targeting SteamworksPy, enabling remote code execution via crafted input. Includes proof-of-concept for vulnerability verification.
Responsible use
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