UBUNTU-CVE-2021-3566

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    UBUNTU-CVE-2021-3566

    Published: 5 Aug 2021Last Modified: 22 Apr 2026
    Upstream:
    CVE-2021-3566
    Aliases:
    USN-5167-1

    Summary:

    Details: Prior to ffmpeg version 4.3, the tty demuxer did not have a 'read_probe' function assigned to it. By crafting a legitimate "ffconcat" file that references an image, followed by a file the triggers the tty demuxer, the contents of the second file will be copied into the output file verbatim (as long as the `-vcodec copy` option is passed to ffmpeg).

    References: https://ubuntu.com/security/CVE-2021-3566, https://github.com/FFmpeg/FFmpeg/commit/3bce9e9b3ea35c54bacccc793d7da99ea5157532#diff-74f6b92a0541378ad15de9c29c0a2b0c69881ad9ffc71abe568b88b535e00a7f, https://ubuntu.com/security/notices/USN-5167-1, https://www.cve.org/CVERecord?id=CVE-2021-3566

    Affected packages

    Package

    Name: ffmpeg

    Purl: pkg:deb/ubuntu/ffmpeg@7:2.8.17-0ubuntu0.1+esm4?arch=source&distro=esm-apps/xenial

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -7:2.8.17-0ubuntu0.1+esm4

    Affected versions

    7:2.7.2-1build1

    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
    UBUNTU-CVE-2021-3566 | CVE-DB