USN-4721-1

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    USN-4721-1

    Published: 4 Feb 2021Last Modified: 22 Apr 2026

    Summary: flatpak vulnerability

    Details: Simon McVittie discovered that flatpak-portal service allowed sandboxed applications to execute arbitrary code on the host system (a sandbox escape). A malicious user could create a Flatpak application that set environment variables, trusted by the Flatpak "run" command, and use it to execute arbitrary code outside the sandbox.

    References: https://ubuntu.com/security/notices/USN-4721-1, https://ubuntu.com/security/CVE-2021-21261

    Affected packages

    Package

    Name: flatpak

    Purl: pkg:deb/ubuntu/[email protected]?arch=source&distro=bionic

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -1.0.9-0ubuntu0.2

    Affected versions

    0.8.7-5

    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
    USN-4721-1 | CVE-DB