CVE-2021-30481

8.0 HIGH
Published: April 10, 2021 Modified: November 03, 2025

Description

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.

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CVSS v3.x Details

0.0 Low Medium High Critical 10.0
Vector String
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory
https://news.ycombinator.com/item?id=26762170
Source: cve@mitre.org
Issue Tracking Third Party Advisory
https://twitter.com/floesen_/status/1337107178096881666
Source: cve@mitre.org
Third Party Advisory
https://twitter.com/the_secret_club/status/1380868759129296900
Source: cve@mitre.org
Exploit Third Party Advisory
https://www.youtube.com/watch?v=rNQn--9xR1Q
Source: cve@mitre.org
Exploit Third Party Advisory
https://news.ycombinator.com/item?id=26762170
Source: af854a3a-2127-422b-91ae-364da2661108
Issue Tracking Third Party Advisory
https://twitter.com/floesen_/status/1337107178096881666
Source: af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory
https://twitter.com/the_secret_club/status/1380868759129296900
Source: af854a3a-2127-422b-91ae-364da2661108
Exploit Third Party Advisory
https://www.youtube.com/watch?v=rNQn--9xR1Q
Source: af854a3a-2127-422b-91ae-364da2661108
Exploit Third Party Advisory

8 reference(s) from NVD

Quick Stats

CVSS v3 Score
8.0 / 10.0
EPSS (Exploit Probability)
11.0%
93th percentile
Exploitation Status
Not in CISA KEV

Weaknesses (CWE)

Affected Vendors

valvesoftware