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CVE-2021-43859

Denial of Service by injecting highly recursive collections or maps in XStream

HIGH
7.5
CVSS Score
Published: February 1, 2022 at 12:08 PM UTC
Updated: June 17, 2026 at 04:11 AM UTC
11 products affected across 5 vendorsDebian LinuxFedoraJenkins

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Severity
HIGH7.5
Exploit prediction
EPSS 8%
SSVC
PoC

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Debian Linux· Debiandrupal
95%
9.0
Fedora· Fedora Projectrpm
95%
3435
Jenkins· Jenkinsjenkins-plugin
95%
v < 2.319.32.321 ≤ v < 2.334
Affected range stops below 2.319.3, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.334, so it looks safe — our inference, not a vendor statement
Commerce Guided Search· Oracledrupal
95%
11.3.2
Communications Brm Elastic Charging Engine· Oracle
95%
v < 12.0.0.4.612.0.0.5.0
Affected range stops below 12.0.0.4.6, so it looks safe — our inference, not a vendor statement
Communications Cloud Native Core Automated Test Suite· Oracle
95%
1.9.0
Communications Diameter Intelligence Hub· Oracle
95%
8.0.0 ≤ v ≤ 8.1.08.2.0 ≤ v ≤ 8.2.6
Communications Policy Management· Oraclenpm
95%
12.6.0.0.0
Flexcube Private Banking· Oracle
95%
12.1.0
Retail Xstore Point of Service· Oracle
95%
16.0.617.0.418.0.319.0.220.0.1

References (10)

Mailing Listx_refsource_MLISTThird Party Advisory
Source: [email protected]
http://www.openwall.com/lists/oss-security/2022/02/09/1
x_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://github.com/x-stream/xstream/commit/e8e88621ba1c85ac3b8620337dd672e0c0c3a846
x_refsource_CONFIRMExploitThird Party Advisory
Source: [email protected]
https://github.com/x-stream/xstream/security/advisories/GHSA-rmr5-cpv2-vgjf
Mailing Listx_refsource_MLISTThird Party Advisory
Source: [email protected]
https://lists.debian.org/debian-lts-announce/2022/02/msg00018.html
Vendor Advisoryx_refsource_FEDORAMailing List
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VACQYG356OHUTD5WQGAQ4L2TTFTAV3SJ/
Vendor Advisoryx_refsource_FEDORAMailing List
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XODFRE2ZL64FICBJDOPWOLPTSSAI4U7X/
x_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://www.oracle.com/security-alerts/cpuapr2022.html
x_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://www.oracle.com/security-alerts/cpujul2022.html

SSVC — Action Prioritization

SSVCPoCAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHGitHub_M
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-400

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