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HIGH

CVE-2021-39150

CVSS v3

8.5

HIGH

EPSS Score

3.4 %

exploit probability, as of 2026-10-19

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • com.thoughtworks.xstream:xstreamMavenall versions · fixed in 1.4.18

Vendor advisories

  • CVE-2021-39150 Red Hat Product Security17 products fixed · 9 known affected

    xstream: Server-side request forgery (SSRF) via unsafe deserialization of com.sun.xml.internal.ws.client.sei.*

    xstream as a component of Red Hat BPM Suite 6 · xstream as a component of Red Hat JBoss A-MQ 6 · xstream as a component of Red Hat JBoss BRMS 5

  • RHSA-2022:0520 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat Data Grid 8.3.0 security update

  • RHSA-2022:0297 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat Decision Manager 7.12.0 security update

  • RHSA-2022:0296 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat Process Automation Manager 7.12.0 security update

  • RHSA-2021:4918 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat Integration Camel-K 1.6 release and security update

  • RHSA-2021:4767 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat Integration Camel Extensions for Quarkus GA security update

1 more advisory

Full record on NVD

Description

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](https://x-stream.github.io/security.html#framework), you will have to use at least version 1.4.18.

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Published
2021-08-23
Last Modified
2026-10-07

Frequently asked questions

What is CVE-2021-39150?

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](https://x-stream.github.io/security.html#framework), you will have to use at least version 1.4.18.

Is CVE-2021-39150 actively exploited?

Active exploitation of CVE-2021-39150 has not been confirmed. Its EPSS score was 3.4% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

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

CVE-2021-39150 has a CVSS v3 base score of 8.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H.

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