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    Dashboard / CVE / CVE-2021-20257

    CVE-2021-20257

    An infinite loop flaw was found in the e1000 NIC emulator of the QEMU. This issue occurs while processing transmits (tx) descriptors in process_tx_desc if various descriptor fields are initialized with invalid values. This flaw allows a guest to consume CPU cycles on the host, resulting in a denial of service. The highest threat from this vulnerability is to system availability.

    Published:Feb 10, 2021
    Last Modified:Nov 21, 2024
    EPS:Mar 16, 2022
    EPSS Score:0.00043
    CVSS Score:6.5

    Affected Products

    Vendor
    Debian
    Product
    Debian Linux
    Vendor
    Fedoraproject
    Product
    Fedora
    Vendor
    Qemu
    Product
    Qemu
    Vendor
    Redhat
    Product
    Advanced Virtualization
    Vendor
    Redhat
    Product
    Codeready Linux Builder
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Enterprise Linux For Ibm Z Systems
    Vendor
    Redhat
    Product
    Enterprise Linux For Power Little Endian
    Vendor
    Redhat
    Product
    Openstack Platform

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

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    References

    https://bugzilla.redhat.com/show_bug.cgi?id=1930087
    https://github.com/qemu/qemu/commit/3de46e6fc489c52c9431a8a832ad8170a7569bd8
    https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html
    https://lists.gnu.org/archive/html/qemu-devel/2021-02/msg07428.html
    https://security.gentoo.org/glsa/202208-27
    https://security.netapp.com/advisory/ntap-20220425-0003/
    https://www.openwall.com/lists/oss-security/2021/02/25/2
    https://bugzilla.redhat.com/show_bug.cgi?id=1930087
    https://github.com/qemu/qemu/commit/3de46e6fc489c52c9431a8a832ad8170a7569bd8
    https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html
    https://lists.gnu.org/archive/html/qemu-devel/2021-02/msg07428.html
    https://security.gentoo.org/glsa/202208-27
    https://security.netapp.com/advisory/ntap-20220425-0003/
    https://www.openwall.com/lists/oss-security/2021/02/25/2

    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