CASCACascade Atlas

Evidence dossier

CVE-2021-39144

XStream is vulnerable to a Remote Command Execution attack

74.8–96.1Priority evidence range
As known Jul 19, 2026, 5:00 AM UTCgen-56ccdaf9

Normalized restatement

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.

State
PUBLISHED
Published
Aug 23, 2021
Updated
Oct 21, 2025
Evidence coverage
72%
CISA KEVCatalog member

Apply updates per vendor instructions.

FIRST EPSS98.12%

2026-07-18 · v2026.06.15 · percentile 99.9%

Source stateConflict visible

Distinct CVSS assessments remain side by side; none are averaged.

Source comparison

Who said what

CISA-ADPindependent enrichment
container

CISA ADP Vulnrichment

CVEderivative copy
container

CVE Program Container

GitHub_Moriginal assertion
container

XStream is vulnerable to a Remote Command Execution attack

CISA KEVoriginal assertion
observed_exploitation

XStream Remote Code Execution Vulnerability

FIRST EPSSoriginal assertion
model_probability

Probability 0.981240000000; percentile 0.999080000000

Applicability

Cited product scope

Trace impact →
x-streamxstream
[{"status": "affected", "version": "< 1.4.18"}]unknown
Unknown vendorUnknown product
cpe:2.3:a:netapp:snapmanager:-:*:*:*:*:oracle:*:*supported
Unknown vendorUnknown product
cpe:2.3:a:netapp:snapmanager:-:*:*:*:*:sap:*:*supported
Unknown vendorUnknown product
cpe:2.3:a:oracle:business_activity_monitoring:12.2.1.4.0:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:a:oracle:commerce_guided_search:11.3.2:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:a:oracle:communications_billing_and_revenue_management_elastic_charging_engine:11.3:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:a:oracle:communications_billing_and_revenue_management_elastic_charging_engine:12.0:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:a:oracle:communications_cloud_native_core_automated_test_suite:1.9.0:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:a:oracle:communications_cloud_native_core_binding_support_function:1.10.0:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:a:oracle:communications_cloud_native_core_policy:1.14.0:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:a:oracle:communications_unified_inventory_management:7.3.4:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:a:oracle:communications_unified_inventory_management:7.3.5:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:a:oracle:communications_unified_inventory_management:7.4.0:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:a:oracle:communications_unified_inventory_management:7.4.1:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:a:oracle:communications_unified_inventory_management:7.4.2:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:a:oracle:retail_xstore_point_of_service:16.0.6:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:a:oracle:retail_xstore_point_of_service:17.0.4:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:a:oracle:retail_xstore_point_of_service:18.0.3:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:a:oracle:retail_xstore_point_of_service:19.0.2:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:a:oracle:retail_xstore_point_of_service:20.0.1:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:a:oracle:utilities_framework:4.2.0.2.0:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:a:oracle:utilities_framework:4.2.0.3.0:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:a:oracle:utilities_framework:4.3.0.1.0:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:a:oracle:utilities_framework:4.3.0.6.0:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:a:oracle:utilities_framework:4.4.0.0.0:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:a:oracle:utilities_framework:4.4.0.2.0:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:a:oracle:utilities_framework:4.4.0.3.0:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:a:oracle:utilities_testing_accelerator:6.0.0.1.1:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:a:oracle:webcenter_portal:12.2.1.3.0:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:a:oracle:webcenter_portal:12.2.1.4.0:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:a:xstream:xstream:*:*:*:*:*:*:*:*; end excluding 1.4.18supported
Unknown vendorUnknown product
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*supported

Assessments

CVSS by origin

8.5
nvd@nist.govCVSS 3.1 · role PrimaryCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
6.0
nvd@nist.govCVSS 2.0 · role PrimaryAV:N/AC:M/Au:S/C:P/I:P/A:P
8.5
security-advisories@github.comCVSS 3.1 · role SecondaryCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
8.5
GitHub_MCVSS 3.1 · role unknownCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

Limitations and unknowns

  • KEV membership is authoritative for the catalog, not proof of exposure in any environment.
  • EPSS is a dated model probability and not an individual-environment prediction.
  • Affected or fixed status applies only to the exact cited product and version scope; unresolved scope remains unknown.
  • NVD-carried upstream facts remain derivative and are not independent corroboration.
  • Only NVD metrics validated under the generation-bound calculator are Public Priority eligible; direct CVE record metrics remain display-only.
  • NVD CVSS source eligibility is closed: NVD-authored, exact record-source, or registered same-CVE container origin; unmapped sources remain display-only.
  • Factor D is unknown in Public Core because no accepted canonical mapping-obligation ledger is present.
  • Core replay supports the active and immediately prior generation; retrospective valid-at replay is deferred.