What is the CVSS score of CVE-2021-39150?

CVE-2021-39150 has a CVSS 3.1 base score of 8.5 (High). CVSS vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H. EPSS exploitation probability: 3.4%.

Is there a public PoC exploit available for CVE-2021-39150?

Yes, a public proof-of-concept exploit is available for CVE-2021-39150. Prioritise patching immediately. EPSS: 3.4%.

Is there a patch available for CVE-2021-39150?

Yes, a patch is available for CVE-2021-39150. Update the affected software to the latest version immediately.

Xstream CVE-2021-39150

HIGH

Deserialization of Untrusted Data (CWE-502)

2021-08-23 security-advisories@github.com

Java Deserialization Debian Oracle Debian Linux Fedora Snapmanager Utilities Framework Communications Cloud Native Core Binding Support Function Communications Cloud Native Core Policy Commerce Guided Search Retail Xstore Point Of Service Webcenter Portal Communications Unified Inventory Management Utilities Testing Accelerator Xstream Communications Cloud Native Core Automated Test Suite Business Activity Monitoring Communications Billing And Revenue Management Elastic Charging Engine Netapp Fedoraproject

8.5

CVSS 3.1 · NVD

View

Vulnerability Assessment

Weakness	CWE CWE-502 OWASP Top 10:2025 A08:2025 - Software or Data Integrity Failures ASVS 5.0 V1 - Encoding and Sanitization Safe deserialization, type allowlists MITRE ATT&CK 2 techniques across 2 tactics: Execution, Initial Access 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 8.5 (HIGH). Attack characteristics: network attack vector, high complexity, low privileges required, no user interaction not required. Public proof-of-concept exploit code is available.
Exploit ScenarioDerived	A remote attacker could execute arbitrary code through malicious serialized objects by sending crafted requests to the affected application.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).

Patch available 3.4% exploitation probability (EPSS)

Get an e-mail when this CVE is exploited, patched or re-scored. Free account.

Alert me

AnalysisAI

XStream is a simple library to serialize objects to XML and back again. Rated high severity (CVSS 8.5), this vulnerability is remotely exploitable. Public exploit code available.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Avoid deserializing untrusted data. Use safe serialization formats (JSON). Implement integrity checks and type allowlists.

Affected Packages

maven com.thoughtworks.xstream:xstream fix: 1.4.18

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 Deserialization of Untrusted Data (CWE-502), which allows attackers to execute arbitrary code through malicious serialized objects. XStream is a simple library to serialize objects to XML and back again. In affected versions this vulnerability may allow a remote attacker to request data from internal resources that are not publicly available only by manipulating the processed input stream with a Java runtime version 14 to 8. 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 1.4.18. Affected products include: Xstream, Fedoraproject Fedora, Debian Debian Linux, Netapp Snapmanager, Oracle Business Activity Monitoring. Version information: version 14.

Know when Xstream gets its next vulnerability

Watch products and get an email when something new is published
Check this CVE against your own stack and servers
Exploit and PoC references, threat intelligence from 22 sources

Continue with Google Continue with GitHub

No credit card · 7-day full trial

Severity by source

NVD PRIMARY 8.5 HIGH

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

DescriptionNVD

XStream is a simple library to serialize objects to XML and back again. In affected versions this vulnerability may allow a remote attacker to request data from internal resources that are not publicly available only by manipulating the processed input stream with a Java runtime version 14 to 8. 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 1.4.18.

Blast Radius

ecosystem impact

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

1,777 maven packages depend on com.thoughtworks.xstream:xstream (204 direct, 1,576 indirect)

Ecosystem-wide dependent count for version 1.4.18.

Threat Intelligence Overview

EPSS Score

3.4%

Top 12% 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 3.4%

Patch available Yes

Active threat No

Deciding rule

HIGH severity (CVSS 7.0-8.9)

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

Human Impact· derived

Medium

Priority Score

Low Medium High Critical

KEV: 0

EPSS: +3

CVSS: +42

PoC: +20

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Insecure Deserialization CRITICAL

Insecure deserialization occurs when an application converts serialized data (a stream of bytes representing an object's state) back into a living object without proper validation.

Affected Products (CPE)NVD

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

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

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

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

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:a:netapp:snapmanager:-:*:*:*:*:oracle:*:*

cpe:2.3:a:netapp:snapmanager:-:*:*:*:*:sap:*:*

cpe:2.3:a:oracle:business_activity_monitoring:12.2.1.4.0:*:*:*:*:*:*:*

cpe:2.3:a:oracle:commerce_guided_search:11.3.2:*:*:*:*:*:*:*

cpe:2.3:a:oracle:communications_billing_and_revenue_management_elastic_charging_engine:11.3:*:*:*:*:*:*:*

cpe:2.3:a:oracle:communications_billing_and_revenue_management_elastic_charging_engine:12.0:*:*:*:*:*:*:*

cpe:2.3:a:oracle:communications_cloud_native_core_automated_test_suite:1.9.0:*:*:*:*:*:*:*

cpe:2.3:a:oracle:communications_cloud_native_core_binding_support_function:1.10.0:*:*:*:*:*:*:*

cpe:2.3:a:oracle:communications_cloud_native_core_policy:1.14.0:*:*:*:*:*:*:*

cpe:2.3:a:oracle:communications_unified_inventory_management:7.3.4:*:*:*:*:*:*:*

cpe:2.3:a:oracle:communications_unified_inventory_management:7.3.5:*:*:*:*:*:*:*

cpe:2.3:a:oracle:communications_unified_inventory_management:7.4.0:*:*:*:*:*:*:*

cpe:2.3:a:oracle:communications_unified_inventory_management:7.4.1:*:*:*:*:*:*:*

+ 16 more

More in Xstream

View all

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

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

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-2021-21341 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-2021-21342 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

Same weakness CWE-502 – Deserialization of Untrusted Data

View all

CVE-2021-35464 CRITICAL POC

9.8

CVE-2020-10189 CRITICAL POC

9.8

CVE-2019-18935 CRITICAL POC

9.8

CVE-2015-7450 CRITICAL POC

9.8

CVE-2025-53770 CRITICAL POC

9.8

CVE-2020-7961 CRITICAL POC

9.8

CVE-2021-42237 CRITICAL POC

9.8

CVE-2025-24016 CRITICAL POC

9.9

Same technique Deserialization

View all

CVE-2020-0618 HIGH POC

8.8

CVE-2015-4852 CRITICAL POC

9.8

CVE-2025-49113 CRITICAL POC

9.9

References

Advisories & patches

PATCH https://www.oracle.com/security-alerts/cpuapr2022.html PATCH https://www.oracle.com/security-alerts/cpujan2022.html REF https://github.com/x-stream/xstream/security/advisories/GHSA-cxfm-5m4g-x7xp REF https://lists.debian.org/debian-lts-announce/2021/09/msg00017.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-20210923-0003/ REF https://www.debian.org/security/2021/dsa-5004 REF https://www.oracle.com/security-alerts/cpujul2022.html

Search Externally

GitHub PoC

Exploit-DB PacketStorm Snyk Rapid7 Nuclei Templates Trickest PoC

Back