What is the CVSS score of CVE-2021-21341?

CVE-2021-21341 has a CVSS 3.1 base score of 7.5 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. EPSS exploitation probability: 77.8%.

Is there a public PoC exploit available for CVE-2021-21341?

Yes, a public proof-of-concept exploit is available for CVE-2021-21341. Prioritise patching immediately. EPSS: 77.8%.

Is there a patch available for CVE-2021-21341?

Yes, a patch is available for CVE-2021-21341. Update the affected software to the latest version immediately.

Xstream CVE-2021-21341

HIGH

Uncontrolled Resource Consumption (CWE-400)

2021-03-23 security-advisories@github.com

Denial Of Service Apache Java Debian Oracle Activemq Debian Linux Fedora Oncommand Insight Retail Xstore Point Of Service Banking Platform Webcenter Portal Communications Unified Inventory Management Xstream Jmeter Business Activity Monitoring Communications Billing And Revenue Management Elastic Charging Engine Banking Enterprise Default Management Netapp Fedoraproject

7.5

CVSS 3.1 · NVD

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Vulnerability Assessment

Weakness	CWE CWE-400 OWASP Top 10:2025 A06:2025 - Insecure Design ASVS 5.0 V2 - Validation and Business Logic Resource consumption limits MITRE ATT&CK 1 technique across 1 tactic: Impact The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Impact	CVSS score of 7.5 (HIGH). Attack characteristics: network attack vector, low complexity, no privileges required, no user interaction not required. Public proof-of-concept exploit code is available.
Exploit ScenarioDerived	A remote attacker could cause denial of service by exhausting system resources by sending crafted requests to the affected application. No authentication is required to exploit this vulnerability.

Act Now Prioritize within 24-48h. Why: HIGH severity + EPSS > 10%.

Patch available 77.8% exploitation probability (EPSS)

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AnalysisAI

XStream is a Java library to serialize objects to XML and back again. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Implement rate limiting, set resource quotas, validate input sizes, use timeouts.

Affected Packages

maven com.thoughtworks.xstream:xstream fix: 1.4.16

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in maven

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

This vulnerability is classified as Uncontrolled Resource Consumption (CWE-400), which allows attackers to cause denial of service by exhausting system resources. XStream is a Java library to serialize objects to XML and back again. In XStream before version 1.4.16, there is vulnerability which 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. No user is affected who followed the recommendation to setup XStream's security framework with a whitelist limited to the minimal required types. If you rely on XStream's default blacklist of the Security Framework, you will have to use at least version 1.4.16. Affected products include: Netapp Oncommand Insight, Apache Activemq, Apache Jmeter, Xstream, Debian Debian Linux. Version information: version 1.4.16.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 7.5 HIGH

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

DescriptionNVD

XStream is a Java library to serialize objects to XML and back again. In XStream before version 1.4.16, there is vulnerability which 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. No user is affected who followed the recommendation to setup XStream's security framework with a whitelist limited to the minimal required types. If you rely on XStream's default blacklist of the Security Framework, you will have to use at least version 1.4.16.

Blast Radius

ecosystem impact

† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth

1,342 maven packages depend on com.thoughtworks.xstream:xstream (145 direct, 1,199 indirect)

Ecosystem-wide dependent count for version 1.4.16.

Threat Intelligence Overview

Threat Score

5.3/10

Composite threat intelligence

EPSS Score

77.8%

Top 0% exploitable

Exploit

POC

Public exploit code exists

Data Quality

4 sources

Confidence: Medium

NVD

CVE.org

EPSS

GitHub

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity HIGH

CISA KEV No

Public POC Yes

EPSS 77.8%

Patch available Yes

Active threat Yes

Deciding rule

HIGH severity + EPSS > 10%

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Scheduled

Exploitation· derived

Poc

System Exposure· derived

Open

Automatable· derived

Yes

Human Impact· derived

Medium

Priority Score

136

Low Medium High Critical

KEV: 0

EPSS: +78

CVSS: +38

PoC: +20

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Denial of Service MEDIUM

Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.

Affected Products (CPE)NVD

cpe:2.3:a:netapp:oncommand_insight:-:*:*:*:*:*:*:*

cpe:2.3:a:apache:activemq:*:*:*:*:*:*:*:*

cpe:2.3:a:apache:activemq:5.16.0:*:*:*:*:*:*:*

cpe:2.3:a:apache:activemq:5.16.1:*:*:*:*:*:*:*

cpe:2.3:a:apache:jmeter:*:*:*:*:*:*:*:*

cpe:2.3:a:xstream:xstream:*:*:*:*:*:*:*:*

cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*

cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*

cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*

cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*

cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*

cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*

cpe:2.3:a:oracle:banking_enterprise_default_management:2.10.0:*:*:*:*:*:*:*

cpe:2.3:a:oracle:banking_enterprise_default_management:2.12.0:*:*:*:*:*:*:*

cpe:2.3:a:oracle:banking_platform:2.4.0:*:*:*:*:*:*:*

cpe:2.3:a:oracle:banking_platform:2.7.1:*:*:*:*:*:*:*

cpe:2.3:a:oracle:banking_platform:2.9.0:*:*:*:*:*:*:*

cpe:2.3:a:oracle:banking_platform:2.12.0:*:*:*:*:*:*:*

cpe:2.3:a:oracle:business_activity_monitoring:11.1.1.9.0:*:*:*:*:*:*:*

cpe:2.3:a:oracle:business_activity_monitoring:12.2.1.3.0:*:*:*:*:*:*:*

+ 14 more

More in Xstream

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CVE-2020-26217 HIGH Act Now POC

8.8 Nov 16

XStream before version 1.4.14 is vulnerable to Remote Code Execution.The vulnerability may allow a remote attacker to ru

CVE-2021-21351 CRITICAL Act Now POC

9.1 Mar 23

XStream is a Java library to serialize objects to XML and back again. Rated critical severity (CVSS 9.1), this vulnerabi

CVE-2021-21346 CRITICAL Act Now POC

9.8 Mar 23

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CVE-2021-21344 CRITICAL Act Now POC

9.8 Mar 23

XStream is a Java library to serialize objects to XML and back again. Rated critical severity (CVSS 9.8), this vulnerabi

CVE-2021-21345 CRITICAL Act Now POC

9.9 Mar 23

XStream is a Java library to serialize objects to XML and back again. Rated critical severity (CVSS 9.9), this vulnerabi

CVE-2021-29505 HIGH Act Now POC

8.8 May 28

XStream is software for serializing Java objects to XML and back again. Rated high severity (CVSS 8.8), this vulnerabili

CVE-2020-26258 HIGH Act Now POC

7.7 Dec 16

XStream is a Java library to serialize objects to XML and back again. Rated high severity (CVSS 7.7), this vulnerability

CVE-2020-26259 MEDIUM This Month POC

6.8 Dec 16

XStream is a Java library to serialize objects to XML and back again. Rated medium severity (CVSS 6.8), this vulnerabili

CVE-2021-21342 CRITICAL Act Now POC

9.1 Mar 23

XStream is a Java library to serialize objects to XML and back again. Rated critical severity (CVSS 9.1), this vulnerabi

CVE-2021-21349 HIGH Act Now POC

8.6 Mar 23

XStream is a Java library to serialize objects to XML and back again. Rated high severity (CVSS 8.6), this vulnerability

CVE-2021-21343 HIGH Act Now POC

7.5 Mar 23

XStream is a Java library to serialize objects to XML and back again. Rated high severity (CVSS 7.5), this vulnerability

CVE-2021-21350 CRITICAL Act Now POC

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XStream is a Java library to serialize objects to XML and back again. Rated critical severity (CVSS 9.8), this vulnerabi

Same weakness CWE-400 – Uncontrolled Resource Consumption

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References

Advisories & patches

PATCH https://www.oracle.com/security-alerts/cpujan2022.html REF http://x-stream.github.io/changes.html#1.4.16 REF https://github.com/x-stream/xstream/security/advisories/GHSA-2p3x-qw9c-25hh REF https://lists.apache.org/thread.html/r8244fd0831db894d5e89911ded9c72196d395a90ae655414d23ed0dd%40%3Cusers.activemq.apache.org%3E REF https://lists.apache.org/thread.html/r9ac71b047767205aa22e3a08cb33f3e0586de6b2fac48b425c6e16b0%40%3Cdev.jmeter.apache.org%3E REF https://lists.debian.org/debian-lts-announce/2021/04/msg00002.html REF https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/22KVR6B5IZP3BGQ3HPWIO2FWWCKT3DHP/ REF https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PVPHZA7VW2RRSDCOIPP2W6O5ND254TU7/ REF https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QGXIU3YDPG6OGTDHMBLAFN7BPBERXREB/ REF https://security.netapp.com/advisory/ntap-20210430-0002/ REF https://www.debian.org/security/2021/dsa-5004 REF https://www.oracle.com//security-alerts/cpujul2021.html REF https://www.oracle.com/security-alerts/cpuoct2021.html REF https://x-stream.github.io/security.html#workaround

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