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CVE Vulnerabilities

CVE-2021-39152

Deserialization of Untrusted Data

Published: Aug 23, 2021 | Modified: May 23, 2025
CVSS 3.x
8.5
HIGH
Source:
NVD
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
CVSS 2.x
6 MEDIUM
AV:N/AC:M/Au:S/C:P/I:P/A:P
RedHat/V2
RedHat/V3
8.5 IMPORTANT
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Ubuntu
MEDIUM
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Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2021-39152
CWEhttps://cwe.mitre.org/data/definitions/502.html

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 XStreams security framework with a whitelist limited to the minimal required types. If you rely on XStreams default blacklist of the Security Framework, you will have to use at least version 1.4.18.

Weakness

The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.

Affected Software

NameVendorStart VersionEnd Version
XstreamXstream*1.4.18 (excluding)
Red Hat Data Grid 8.3.0RedHatxstream*
Red Hat Enterprise Linux 7RedHatxstream-0:1.3.1-16.el7_9*
Red Hat IntegrationRedHatxstream*
Red Hat Integration Camel Quarkus 2RedHat*
RHDM 7.12.0RedHatxstream*
RHPAM 7.12.0RedHatxstream*
Libxstream-javaUbuntubionic*
Libxstream-javaUbuntuesm-apps/bionic*
Libxstream-javaUbuntuesm-apps/focal*
Libxstream-javaUbuntufocal*
Libxstream-javaUbuntuhirsute*
Libxstream-javaUbuntuimpish*
Libxstream-javaUbuntutrusty*
Libxstream-javaUbuntuxenial*

Potential Mitigations

  • Make fields transient to protect them from deserialization.
  • An attempt to serialize and then deserialize a class containing transient fields will result in NULLs where the transient data should be. This is an excellent way to prevent time, environment-based, or sensitive variables from being carried over and used improperly.

References

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