CVE-2021-30481

Valve Steam through 2021-04-10, 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.

CVSS v3.1 NVD

9.0 CRITICALCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H

CVSS v3.1 MITRE

8.0 HIGHCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H

CVSS v2.0 NVD

6.0 MEDIUMAV:N/AC:M/Au:S/C:P/I:P/A:P

EPSS

3.50% chance of exploitation in the next 30 days, 89th percentile

Published

2021-04-10

Updated

2025-11-03

Proof-of-concept exploits (2)

• https://www.youtube.com/watch?v=rNQn--9xR1Q
• floesen/CVE-2021-3048158★ · 2021-04-20

Exploit collections (1)

• Steam远程代码执行漏洞（CVE-2021-30481）.mdtzwlhack/Vulnerability

Security advisories

• https://news.ycombinator.com/item?id=26762170
• https://twitter.com/floesen_/status/1337107178096881666
• https://twitter.com/the_secret_club/status/1380868759129296900

References

• CVE Record
• NVD entry