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    CVE-2021-43859

    XStream is an open source java library to serialize objects to XML and back again. Versions prior to 1.4.19 may allow a remote attacker to allocate 100% CPU time on the target system depending on CPU type or parallel execution of such a payload resulting in a denial of service only by manipulating the processed input stream. XStream 1.4.19 monitors and accumulates the time it takes to add elements to collections and throws an exception if a set threshold is exceeded. Users are advised to upgrade as soon as possible. Users unable to upgrade may set the NO_REFERENCE mode to prevent recursion. See GHSA-rmr5-cpv2-vgjf for further details on a workaround if an upgrade is not possible.

    Published:Jan 29, 2022
    Last Modified:Nov 3, 2025
    EPS:Feb 1, 2022
    EPSS Score:0.02139
    CVSS Score:7.5

    Affected Products

    Vendor
    Debian
    Product
    Debian Linux
    Vendor
    Fedoraproject
    Product
    Fedora
    Vendor
    Jenkins
    Product
    Jenkins
    Vendor
    Oracle
    Product
    Commerce Guided Search
    Vendor
    Oracle
    Product
    Communications Brm - Elastic Charging Engine
    Vendor
    Oracle
    Product
    Communications Cloud Native Core Automated Test Suite
    Vendor
    Oracle
    Product
    Communications Diameter Intelligence Hub
    Vendor
    Oracle
    Product
    Communications Policy Management
    Vendor
    Oracle
    Product
    Flexcube Private Banking
    Vendor
    Oracle
    Product
    Retail Xstore Point Of Service
    Vendor
    Redhat
    Product
    Camel Quarkus
    Vendor
    Redhat
    Product
    Jboss Fuse
    Vendor
    Redhat
    Product
    Openshift
    Vendor
    Xstream
    Product
    Xstream

    Exploits

    https://github.com/x-stream/xstream/security/advisories/GHSA-rmr5-cpv2-vgjfhttps://x-stream.github.io/CVE-2021-43859.htmlhttps://github.com/x-stream/xstream/security/advisories/GHSA-rmr5-cpv2-vgjfhttps://x-stream.github.io/CVE-2021-43859.htmlhttps://github.com/dawetmaster/CVE-2021-43859-xstream-vulnerable

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    References

    http://www.openwall.com/lists/oss-security/2022/02/09/1
    https://github.com/x-stream/xstream/commit/e8e88621ba1c85ac3b8620337dd672e0c0c3a846
    https://github.com/x-stream/xstream/security/advisories/GHSA-rmr5-cpv2-vgjf
    https://lists.debian.org/debian-lts-announce/2022/02/msg00018.html
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VACQYG356OHUTD5WQGAQ4L2TTFTAV3SJ/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XODFRE2ZL64FICBJDOPWOLPTSSAI4U7X/
    https://www.oracle.com/security-alerts/cpuapr2022.html
    https://www.oracle.com/security-alerts/cpujul2022.html
    https://x-stream.github.io/CVE-2021-43859.html
    http://www.openwall.com/lists/oss-security/2022/02/09/1
    https://github.com/x-stream/xstream/commit/e8e88621ba1c85ac3b8620337dd672e0c0c3a846
    https://github.com/x-stream/xstream/security/advisories/GHSA-rmr5-cpv2-vgjf
    https://lists.debian.org/debian-lts-announce/2022/02/msg00018.html
    https://lists.debian.org/debian-lts-announce/2024/12/msg00023.html
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VACQYG356OHUTD5WQGAQ4L2TTFTAV3SJ/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XODFRE2ZL64FICBJDOPWOLPTSSAI4U7X/
    https://www.oracle.com/security-alerts/cpuapr2022.html
    https://www.oracle.com/security-alerts/cpujul2022.html
    https://x-stream.github.io/CVE-2021-43859.html

    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