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CVE-2021-39144

HIGH8.5
CISA KEV

Published 2021-08-23 · Updated 2026-06-17 · Source security-advisories@github.com

Summary

CVE-2021-39144 is a high-severity (CVSS 8.5) vulnerability in XStream XStream. CISA added it to the Known Exploited Vulnerabilities catalog on March 10, 2023, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by March 31, 2023. CISA does not currently list it as used in ransomware campaigns.

All 1 known-exploited XStream vulnerabilities →

Description

XStream is a simple library to serialize objects to XML and back again. In affected versions this vulnerability may allow a remote attacker has sufficient rights to execute commands of the host 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. XStream 1.4.18 uses no longer a blacklist by default, since it cannot be secured for general purpose.

CVSS vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

CWE-94CWE-502CWE-306CWE-502

CISA Known-Exploited Vulnerability

Product: XStream — XStream

Name: XStream Remote Code Execution Vulnerability

Date added: 2023-03-10 · Due: 2023-03-31

Required action: Apply updates per vendor instructions.

References

View on NVD