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CVE-2021-43859

7.5 · HIGH

XStream is an open source java library to serialize objects to XML and back again.

Published Feb 1, 2022CWE-400EPSS 7.93%

Overview

CVE-2021-43859 is a high-severity vulnerability. It was published on February 1, 2022 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refwww.openwall.com/lists/oss-security/2022/02/09/1GitHubgithub.com/x-stream/xstream/commit/e8e88621ba1c85ac3b8620337dd672e0c0c3a846GitHubgithub.com/x-stream/xstream/security/advisories/GHSA-rmr5-cpv2-vgjfReflists.debian.org/debian-lts-announce/2022/02/msg00018.htmlReflists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VACQYG356OHUTD5WQGAQ4L2TTFTAV3SJ/Reflists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XODFRE2ZL64FICBJDOPWOLPTSSAI4U7X/Refwww.oracle.com/security-alerts/cpuapr2022.htmlRefwww.oracle.com/security-alerts/cpujul2022.htmlRefx-stream.github.io/CVE-2021-43859.htmlRefwww.openwall.com/lists/oss-security/2022/02/09/1

How CyberStrike helps

Frequently asked questions

What is CVE-2021-43859?

CVE-2021-43859 is a high-severity vulnerability. It was published on February 1, 2022 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2021-43859?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-43859?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-43859?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-43859 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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