UBUNTU-CVE-2021-3696

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    UBUNTU-CVE-2021-3696

    Published: 6 Jul 2022Last Modified: 4 Feb 2026
    Upstream:
    CVE-2021-3696
    Aliases:
    USN-6355-1

    Summary:

    Details: A heap out-of-bounds write may heppen during the handling of Huffman tables in the PNG reader. This may lead to data corruption in the heap space. Confidentiality, Integrity and Availablity impact may be considered Low as it's very complex to an attacker control the encoding and positioning of corrupted Huffman entries to achieve results such as arbitrary code execution and/or secure boot circumvention. This flaw affects grub2 versions prior grub-2.12.

    References: https://ubuntu.com/security/CVE-2021-3696, https://www.openwall.com/lists/oss-security/2022/06/07/5, https://ubuntu.com/security/notices/USN-6355-1, https://www.cve.org/CVERecord?id=CVE-2021-3696

    Affected packages

    Package

    Name: grub2-signed

    Purl: pkg:deb/ubuntu/[email protected]?arch=source&distro=esm-infra-legacy/trusty

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    1.22

    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-2021-3696 | CVE-DB