High 8.5Known exploited (CISA KEV)Published Aug 22, 2021

CVE-2021-39144XStream is vulnerable to a Remote Command Execution attack

Updated under an hour ago (Oct 27, 2026, 8:00 PM ET)

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It affects x-stream xstream and 15 other products. Add what you run to find out whether that includes you.

CISA lists it as known exploited since Mar 10, 2023; federal agencies had to remediate by Mar 31, 2023. Treat that date as your deadline.

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Exploited in the last 30 days

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: 8.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Weakness (CWE): CWE-94, CWE-502
Known exploited: Added to CISA KEV Mar 10, 2023; federal remediation due Mar 31, 2023Apply updates per vendor instructions.
EPSS (exploitation in the next 30 days): 98.12% (percentile 100)
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Oct 21, 2025
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

x-stream xstream x_stream:xstream (from the name)	before 1.4.18	CNA record
xstream xstream xstream:xstream	before 1.4.18	NVD
debian debian_linux debian:debian_linux	9.0; 10.0; 11.0	NVD
fedoraproject fedora fedoraproject:fedora	33; 34; 35	NVD
netapp snapmanager netapp:snapmanager	all versions; all versions	NVD
oracle business_activity_monitoring oracle:business_activity_monitoring	12.2.1.4.0	NVD
oracle commerce_guided_search oracle:commerce_guided_search	11.3.2	NVD
oracle communications_billing_and_revenue_management_elastic_charging_engine oracle:communications_billing_and_revenue_management_elastic_charging_engine	11.3; 12.0	NVD
oracle communications_cloud_native_core_automated_test_suite oracle:communications_cloud_native_core_automated_test_suite	1.9.0	NVD
oracle communications_cloud_native_core_binding_support_function oracle:communications_cloud_native_core_binding_support_function	1.10.0	NVD
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References

References

https://github.com/x-stream/xstream/security/advisories/GHSA-j9h8-phrw-h4fh	vendor-advisory
https://x-stream.github.io/CVE-2021-39144.html	exploit, vendor-advisory
https://lists.debian.org/debian-lts-announce/2021/09/msg00017.html	mailing-list, third-party-advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/22KVR6B5IZP3BGQ3HPWIO2FWWCKT3DHP/	vendor-advisory, broken-link, mailing-list, release-notes
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QGXIU3YDPG6OGTDHMBLAFN7BPBERXREB/	vendor-advisory, broken-link, mailing-list, release-notes
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PVPHZA7VW2RRSDCOIPP2W6O5ND254TU7/	vendor-advisory, broken-link, mailing-list, release-notes
https://www.debian.org/security/2021/dsa-5004	vendor-advisory, third-party-advisory
https://www.oracle.com/security-alerts/cpujan2022.html	patch, third-party-advisory
https://security.netapp.com/advisory/ntap-20210923-0003/	third-party-advisory
https://www.oracle.com/security-alerts/cpuapr2022.html	patch, third-party-advisory
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The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.