Is CVE-2021-43859 actively exploited?

CVE-2021-43859 has no public evidence of in-the-wild exploitation as of 2025-11-03.

What is the CVSS score for CVE-2021-43859?

CVE-2021-43859 has a CVSS score of 7.5 (HIGH severity). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

How do I patch CVE-2021-43859?

Patch guidance is available from jenkins security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2021-43859.

Fix CVE-2021-43859 - HIGH jenkins jenkins

Q: Which products are affected by CVE-2021-43859?

19 products: jenkins jenkins, jenkins jenkins, xstream xstream, fedoraproject fedora, fedoraproject fedora, and 14 more.

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.

CVSS Metrics

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector: network
Complexity: low
Privileges: none
User Action: none
Scope: unchanged
Confidentiality: none
Integrity: none
Availability: high
Weaknesses: CWE-400 CWE-400

Metadata

Primary Vendor: JENKINS
Published: 2/1/2022
Last Modified: 11/3/2025
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

Affected Products

jenkins : jenkinsjenkins : jenkinsxstream : xstreamfedoraproject : fedorafedoraproject : fedoradebian : debian_linuxoracle : commerce_guided_searchoracle : communications_brm_-_elastic_charging_engineoracle : communications_brm_-_elastic_charging_engineoracle : communications_cloud_native_core_automated_test_suiteoracle : communications_diameter_intelligence_huboracle : communications_diameter_intelligence_huboracle : communications_policy_managementoracle : flexcube_private_bankingoracle : retail_xstore_point_of_serviceoracle : retail_xstore_point_of_serviceoracle : retail_xstore_point_of_serviceoracle : retail_xstore_point_of_serviceoracle : retail_xstore_point_of_service

Remediation Guidance

Executive Summary

View on NIST NVD