# CVE-2021-39144

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.

- Page: https://www.vulneraibility.com/cve/CVE-2021-39144
- CVSS: 8.5
- Known exploited: yes, in CISA KEV since 2023-03-10; CISA due date 2023-03-31
- EPSS: 98.12% (percentile 99.9)
- Public exploit code: 1 Metasploit module · 1 Nuclei template
- CISA SSVC: exploitation active, automatable no, technical impact total (assessed 2025-02-06)
- Weakness: CWE-94, CWE-502
- Also known as: GHSA-j9h8-phrw-h4fh
- Published: 2021-08-23

## Affected versions

- x-stream xstream: affected < 1.4.18

A version outside these ranges is not a statement that it is unaffected.

## References

- [other] https://github.com/x-stream/xstream/security/advisories/GHSA-j9h8-phrw-h4fh
- [other] https://x-stream.github.io/CVE-2021-39144.html
- [other] https://lists.debian.org/debian-lts-announce/2021/09/msg00017.html
- [advisory] https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/22KVR6B5IZP3BGQ3HPWIO2FWWCKT3DHP/
- [advisory] https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QGXIU3YDPG6OGTDHMBLAFN7BPBERXREB/
- [advisory] https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PVPHZA7VW2RRSDCOIPP2W6O5ND254TU7/
- [advisory] https://www.debian.org/security/2021/dsa-5004
- [other] https://www.oracle.com/security-alerts/cpujan2022.html
- [other] https://security.netapp.com/advisory/ntap-20210923-0003/
- [other] https://www.oracle.com/security-alerts/cpuapr2022.html
- [other] https://www.oracle.com/security-alerts/cpujul2022.html
- [other] http://packetstormsecurity.com/files/169859/VMware-NSX-Manager-XStream-Unauthenticated-Remote-Code-Execution.html
- [other] https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-39144

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Summary, impact and action are written by the vulneraibility.com AI analysis pipeline from the CVE record, NVD, CISA and FIRST data; verify against the references.