CVE-2021-30481

Steam Client vulnerability

CVSS

8.0

EPSS

3.5%

EPSS pct

88th

Exploited

No known

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.

Affected vendor

Valvesoftware

Affected product

Steam Client

CVSS vector

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

Weakness type (CWE)

CWE-120 — Classic Buffer Overflow

Published

2021-04-10

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, high attack complexity, requiring low privileges, user interaction. Successful exploitation leads to high impact to confidentiality, high impact to integrity, high impact to availability.

Its EPSS score of 3.5% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 88% of all scored CVEs.

Check your external exposure to CVE-2021-30481

Confirm whether Valvesoftware Steam Client is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2021-30481.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2021-30481

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