CVE-2021-39144
XStream is vulnerable to a Remote Command Execution attack
- Published
- Aug 23, 2021
- Updated
- Oct 21, 2025
- Assigning CNA
- GitHub_M
- Evidence observed
- Mar 10, 2023
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:HHigh · next 30 days
- Percentile
- 99.9%
- Model date
- Sep 21, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
CISA Known Exploited
This CVE appears in the CISA Known Exploited Vulnerabilities catalog.
Summary
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.
Sources
1XSTREAM<=1.4.17 Vulnerability Reproduction (CVE-2021-39141, CVE-2021-39144, CVE-2021-39150)
Responsible use
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