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    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 overflow that occurs for a Steam invite after one click.

    Published:Apr 10, 2021
    Last Modified:Nov 3, 2025
    EPS:Apr 10, 2021
    EPSS Score:0.10977
    CVSS Score:8

    Affected Products

    Vendor
    Valvesoftware
    Product
    Steam Client

    Exploits

    https://twitter.com/the_secret_club/status/1380868759129296900https://www.youtube.com/watch?v=rNQn--9xR1Qhttps://twitter.com/the_secret_club/status/1380868759129296900https://www.youtube.com/watch?v=rNQn--9xR1Qhttps://github.com/floesen/CVE-2021-30481

    Related CVEs

    CVE-2020-15530 (CVSS 7.8) — An issue was discovered in Valve Steam Client 2.10.91.91. The installer allows local users to gain NT AUTHORIT…
    CVE-2019-17180 (CVSS 7.8) — Valve Steam Client before 2019-09-12 allows placing or appending partially controlled filesystem content, as d…
    CVE-2019-15316 (CVSS 7) — Valve Steam Client for Windows through 2019-08-20 has weak folder permissions, leading to privilege escalation…
    CVE-2019-15315 (CVSS 7.8) — Valve Steam Client for Windows through 2019-08-16 allows privilege escalation (to NT AUTHORITY\SYSTEM) because…
    CVE-2019-14743 (CVSS 6.6) — In Valve Steam Client for Windows through 2019-08-07, HKLM\SOFTWARE\Wow6432Node\Valve\Steam has explicit "Full…
    CVE-2018-12270 (CVSS 5.4) — In Valve Steam 1528829181 BETA, it is possible to perform a homograph / homoglyph attack to create fake URLs i…
    CVE-2015-7985 (CVSS 7.2) — Valve Steam 2.10.91.91 uses weak permissions (Users: read and write) for the Install folder, which allows loca…
    CVE-2015-4016 (CVSS 5) — The client detection protocol in Valve Steam allows remote attackers to cause a denial of service (process cra…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High