Detections
Analytics

CVE-2021-30481

critical

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.

References

https://twitter.com/floesen_/status/1337107178096881666

https://news.ycombinator.com/item?id=26762170

https://github.com/floesen/CVE-2021-30481

https://www.youtube.com/watch?v=rNQn--9xR1Q

https://twitter.com/the_secret_club/status/1380868759129296900

https://euvd.enisa.europa.eu/vulnerability/EUVD-2021-17404

Details

Source: Mitre, NVD

Published: 2021-04-10

Updated: 2026-06-17

Risk Information

CVSS v2

Base Score: 6

Vector: CVSS2#AV:N/AC:M/Au:S/C:P/I:P/A:P

Severity: Medium

CVSS v3

Base Score: 9

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H

Severity: Critical

EPSS

EPSS: 0.03504