GHSA-56p8-3fh9-4cvq · Severity: medium · Ecosystem: maven — XStream is vulnerable to an attack using Regular Expression for a Denial of Service (ReDos)
XStream is a Java library to serialize objects to XML and back again. In XStream before version 1.4.16, there is a vulnerability which may allow a remote attacker to occupy a thread that consumes maximum CPU time and will never return. No user is affected, who followed the recommendation to setup XStream's security framework with a whitelist limited to the minimal required types. If you rely on XStream's default blacklist of the Security Framework, you will have to use at least version 1.4.16.
Conclusion & alert: CVE-2021-21348 is rated Low Risk (38.3/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.26%). Mandatory action: Monitor for updates and reassess as exploit intelligence or EPSS changes.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2026-03-10 | 0.20% | 0.26% | +0.06% |
| 2 | 2025-11-21 | 14.26% | 0.20% | -14.06% |
| 3 | 2025-11-18 | — | 14.26% | — |
Full EPSS history (27 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 5.3 | 3.1 | MEDIUM |
|
1.6 | 3.6 | [email protected] |
| 7.5 | 3.1 | HIGH |
|
3.9 | 3.6 | [email protected] |
| 7.8 | 2.0 | HIGH |
|
10.0 | 6.9 | [email protected] |
GHSA-56p8-3fh9-4cvq · Severity: medium · Ecosystem: maven — XStream is vulnerable to an attack using Regular Expression for a Denial of Service (ReDos)
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
not yet assigned | CVE-2021-21348 not yet assigned priority: Debian including 1 source packages (libxstream-java), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. | https://security-tracker.debian.org/tracker/CVE-2021-21348 |
redhat
|
medium | — | https://access.redhat.com/security/cve/CVE-2021-21348 |
suse
|
medium | CVE-2021-21348 severity moderate: SUSE including 245 source package names (5.0.0-beta1.2.122:xstream-1.4.16-3.8.1, 5.1.0.6.40:xstream-1.4.16-3.8.1, …), 278 product×package rows across 31 product lines (Container suse/manager/5.0/x86_64/server, Container suse/multi-linux-manager/5.1/x86_64/server, … (31 product lines)): Known Affected 231, Fixed 47. | https://www.suse.com/security/cve/CVE-2021-21348/ |
ubuntu
|
low | CVE-2021-21348 low priority: Ubuntu including 1 source packages (libxstream-java), 14 status rows across 14 suites (bionic, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, trusty, upstream, xenial): released 13, needs-triage 1. | https://ubuntu.com/security/CVE-2021-21348 |
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| netapp | oncommand_insight | — | cpe:2.3:a:netapp:oncommand_insight:-:*:*:*:*:*:*:* |
| apache | activemq | < 5.15.14 | cpe:2.3:a:apache:activemq:*:*:*:*:*:*:*:* |
| apache | activemq | 5.16.0 | cpe:2.3:a:apache:activemq:5.16.0:*:*:*:*:*:*:* |
| apache | activemq | 5.16.1 | cpe:2.3:a:apache:activemq:5.16.1:*:*:*:*:*:*:* |
| apache | jmeter | < 5.5 | cpe:2.3:a:apache:jmeter:*:*:*:*:*:*:*:* |
| xstream | xstream | < 1.4.16 | cpe:2.3:a:xstream:xstream:*:*:*:*:*:*:*:* |
| debian | debian_linux | 9.0 | cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* |
| debian | debian_linux | 10.0 | cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* |
| debian | debian_linux | 11.0 | cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* |
| fedoraproject | fedora | 33 | cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* |
| fedoraproject | fedora | 34 | cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:* |
| fedoraproject | fedora | 35 | cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:* |
| oracle | banking_enterprise_default_management | 2.10.0 | cpe:2.3:a:oracle:banking_enterprise_default_management:2.10.0:*:*:*:*:*:*:* |
| oracle | banking_enterprise_default_management | 2.12.0 | cpe:2.3:a:oracle:banking_enterprise_default_management:2.12.0:*:*:*:*:*:*:* |
| oracle | banking_platform | 2.4.0 | cpe:2.3:a:oracle:banking_platform:2.4.0:*:*:*:*:*:*:* |
| oracle | banking_platform | 2.7.1 | cpe:2.3:a:oracle:banking_platform:2.7.1:*:*:*:*:*:*:* |
| oracle | banking_platform | 2.9.0 | cpe:2.3:a:oracle:banking_platform:2.9.0:*:*:*:*:*:*:* |
| oracle | banking_platform | 2.12.0 | cpe:2.3:a:oracle:banking_platform:2.12.0:*:*:*:*:*:*:* |
| oracle | banking_virtual_account_management | 14.2.0 | cpe:2.3:a:oracle:banking_virtual_account_management:14.2.0:*:*:*:*:*:*:* |
| oracle | banking_virtual_account_management | 14.3.0 | cpe:2.3:a:oracle:banking_virtual_account_management:14.3.0:*:*:*:*:*:*:* |
| oracle | banking_virtual_account_management | 14.5.0 | cpe:2.3:a:oracle:banking_virtual_account_management:14.5.0:*:*:*:*:*:*:* |
| oracle | business_activity_monitoring | 11.1.1.9.0 | cpe:2.3:a:oracle:business_activity_monitoring:11.1.1.9.0:*:*:*:*:*:*:* |
| oracle | business_activity_monitoring | 12.2.1.3.0 | cpe:2.3:a:oracle:business_activity_monitoring:12.2.1.3.0:*:*:*:*:*:*:* |
| oracle | business_activity_monitoring | 12.2.1.4.0 | cpe:2.3:a:oracle:business_activity_monitoring:12.2.1.4.0:*:*:*:*:*:*:* |
| oracle | communications_billing_and_revenue_management_elastic_charging_engine | 12.0.0.3.0 | cpe:2.3:a:oracle:communications_billing_and_revenue_management_elastic_charging_engine:12.0.0.3.0:*:*:*:*:*:*:* |
| oracle | communications_policy_management | 12.5.0 | cpe:2.3:a:oracle:communications_policy_management:12.5.0:*:*:*:*:*:*:* |
| oracle | communications_unified_inventory_management | 7.3.2 | cpe:2.3:a:oracle:communications_unified_inventory_management:7.3.2:*:*:*:*:*:*:* |
| oracle | communications_unified_inventory_management | 7.3.4 | cpe:2.3:a:oracle:communications_unified_inventory_management:7.3.4:*:*:*:*:*:*:* |
| oracle | communications_unified_inventory_management | 7.3.5 | cpe:2.3:a:oracle:communications_unified_inventory_management:7.3.5:*:*:*:*:*:*:* |
| oracle | communications_unified_inventory_management | 7.4.0 | cpe:2.3:a:oracle:communications_unified_inventory_management:7.4.0:*:*:*:*:*:*:* |
| oracle | communications_unified_inventory_management | 7.4.1 | cpe:2.3:a:oracle:communications_unified_inventory_management:7.4.1:*:*:*:*:*:*:* |
| oracle | mysql_server | <= 8.0.27 | cpe:2.3:a:oracle:mysql_server:*:*:*:*:*:*:*:* |
| oracle | retail_xstore_point_of_service | 16.0.6 | cpe:2.3:a:oracle:retail_xstore_point_of_service:16.0.6:*:*:*:*:*:*:* |
| oracle | retail_xstore_point_of_service | 17.0.4 | cpe:2.3:a:oracle:retail_xstore_point_of_service:17.0.4:*:*:*:*:*:*:* |
| oracle | retail_xstore_point_of_service | 18.0.3 | cpe:2.3:a:oracle:retail_xstore_point_of_service:18.0.3:*:*:*:*:*:*:* |
| oracle | retail_xstore_point_of_service | 19.0.2 | cpe:2.3:a:oracle:retail_xstore_point_of_service:19.0.2:*:*:*:*:*:*:* |
| oracle | webcenter_portal | 11.1.1.9.0 | cpe:2.3:a:oracle:webcenter_portal:11.1.1.9.0:*:*:*:*:*:*:* |
| oracle | webcenter_portal | 12.2.1.3.0 | cpe:2.3:a:oracle:webcenter_portal:12.2.1.3.0:*:*:*:*:*:*:* |
| oracle | webcenter_portal | 12.2.1.4.0 | cpe:2.3:a:oracle:webcenter_portal:12.2.1.4.0:*:*:*:*:*:*:* |