UBUNTU-CVE-2021-3697

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    UBUNTU-CVE-2021-3697

    Published: 6 Jul 2022Last Modified: 4 Feb 2026
    Upstream:
    CVE-2021-3697
    Aliases:
    USN-6355-1

    Summary:

    Details: A crafted JPEG image may lead the JPEG reader to underflow its data pointer, allowing user-controlled data to be written in heap. To a successful to be performed the attacker needs to perform some triage over the heap layout and craft an image with a malicious format and payload. This vulnerability can lead to data corruption and eventual code execution or secure boot circumvention. This flaw affects grub2 versions prior grub-2.12.

    References: https://ubuntu.com/security/CVE-2021-3697, 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-2021-3697

    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-2021-3697 | CVE-DB