CVE-2021-39150

Publication date 23 August 2021

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

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.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
libxstream-java	23.04 lunar	Not affected
	22.10 kinetic	Not affected
	22.04 LTS jammy	Not affected
	21.10 impish	Ignored end of life
	21.04 hirsute	Ignored end of life
	20.04 LTS focal	Fixed 1.4.11.1-1ubuntu0.3
	18.04 LTS bionic	Fixed 1.4.11.1-1+deb10u4build0.18.04.1
	16.04 LTS xenial	Not affected
	14.04 LTS trusty	Not affected

Notes

sahnaseredini

for `trusty` and `xenial`, the code is not present and the available pocs cannot be exploited

Severity score breakdown

Parameter	Value
Base score	8.5 · High
Attack vector	Network
Attack complexity	High
Privileges required	Low
User interaction	None
Scope	Changed
Confidentiality	High
Integrity impact	High
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

References

Related Ubuntu Security Notices (USN)

USN-5946-1
XStream vulnerabilities
13 March 2023