UBUNTU-CVE-2021-20203

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    UBUNTU-CVE-2021-20203

    Published: 25 Feb 2021Last Modified: 9 Jun 2026
    Upstream:
    CVE-2021-20203

    Summary:

    Details: An integer overflow issue was found in the vmxnet3 NIC emulator of the QEMU for versions up to v5.2.0. It may occur if a guest was to supply invalid values for rx/tx queue size or other NIC parameters. A privileged guest user may use this flaw to crash the QEMU process on the host resulting in DoS scenario.

    References: https://ubuntu.com/security/CVE-2021-20203, https://lists.gnu.org/archive/html/qemu-devel/2021-01/msg07935.html, https://ubuntu.com/security/notices/USN-5307-1, https://www.cve.org/CVERecord?id=CVE-2021-20203, https://ubuntu.com/security/notices/USN-8412-1

    Affected packages

    Package

    Name: qemu

    Purl: pkg:deb/ubuntu/qemu?arch=source&distro=esm-infra-legacy%2Ftrusty

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -2.0.0+dfsg-2ubuntu1.47+esm6

    Affected versions

    1.5.0+dfsg-3ubuntu5
    1.5.0+dfsg-3ubuntu6

    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-2021-20203 | CVE-DB