Vulnerability Database

328,409

Total vulnerabilities in the database

CVE-2021-21348

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.

CVSS v3:

  • Severity: Medium
  • Score: 5.3
  • AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H

CVSS v2:

  • Severity: High
  • Score: 7.8
  • AV:N/AC:L/Au:N/C:N/I:N/A:C
Software From Fixed in
debian / debian_linux 9.0 9.0.x
debian / debian_linux 10.0 10.0.x
debian / debian_linux 11.0 11.0.x
fedoraproject / fedora 33 33.x
fedoraproject / fedora 34 34.x
fedoraproject / fedora 35 35.x
oracle / banking_platform 2.4.0 2.4.0.x
oracle / webcenter_portal 12.2.1.3.0 12.2.1.3.0.x
oracle / webcenter_portal 11.1.1.9.0 11.1.1.9.0.x
oracle / communications_unified_inventory_management 7.3.2 7.3.2.x
oracle / communications_unified_inventory_management 7.3.4 7.3.4.x
oracle / communications_unified_inventory_management 7.3.5 7.3.5.x
oracle / communications_unified_inventory_management 7.4.0 7.4.0.x
oracle / communications_policy_management 12.5.0 12.5.0.x
oracle / webcenter_portal 12.2.1.4.0 12.2.1.4.0.x
oracle / banking_platform 2.7.1 2.7.1.x
oracle / banking_platform 2.9.0 2.9.0.x
oracle / banking_virtual_account_management 14.3.0 14.3.0.x
oracle / communications_billing_and_revenue_management_elastic_charging_engine 12.0.0.3.0 12.0.0.3.0.x
oracle / business_activity_monitoring 12.2.1.3.0 12.2.1.3.0.x
oracle / business_activity_monitoring 11.1.1.9.0 11.1.1.9.0.x
oracle / business_activity_monitoring 12.2.1.4.0 12.2.1.4.0.x
oracle / communications_unified_inventory_management 7.4.1 7.4.1.x
oracle / retail_xstore_point_of_service 16.0.6 16.0.6.x
oracle / retail_xstore_point_of_service 17.0.4 17.0.4.x
oracle / retail_xstore_point_of_service 18.0.3 18.0.3.x
oracle / retail_xstore_point_of_service 19.0.2 19.0.2.x
oracle / banking_platform 2.12.0 2.12.0.x
oracle / banking_virtual_account_management 14.2.0 14.2.0.x
oracle / banking_virtual_account_management 14.5.0 14.5.0.x
oracle / banking_enterprise_default_management 2.12.0 2.12.0.x
oracle / banking_enterprise_default_management 2.10.0 2.10.0.x
oracle / mysql_server - 8.0.27.x
Maven icon com.thoughtworks.xstream / xstream - 1.4.16
apache / activemq - 5.15.14
apache / activemq 5.16.0 5.16.0.x
apache / activemq 5.16.1 5.16.1.x
apache / jmeter - 5.5
xstream / xstream - 1.4.16

Frequently Asked Questions

A security vulnerability is a weakness in software, hardware, or configuration that can be exploited to compromise confidentiality, integrity, or availability. Many vulnerabilities are tracked as CVEs (Common Vulnerabilities and Exposures), which provide a standardized identifier so teams can coordinate patching, mitigation, and risk assessment across tools and vendors.

CVSS (Common Vulnerability Scoring System) estimates technical severity, but it doesn't automatically equal business risk. Prioritize using context like internet exposure, affected asset criticality, known exploitation (proof-of-concept or in-the-wild), and whether compensating controls exist. A "Medium" CVSS on an exposed, production system can be more urgent than a "Critical" on an isolated, non-production host.

A vulnerability is the underlying weakness. An exploit is the method or code used to take advantage of it. A zero-day is a vulnerability that is unknown to the vendor or has no publicly available fix when attackers begin using it. In practice, risk increases sharply when exploitation becomes reliable or widespread.

Recurring findings usually come from incomplete Asset Discovery, inconsistent patch management, inherited images, and configuration drift. In modern environments, you also need to watch the software supply chain: dependencies, containers, build pipelines, and third-party services can reintroduce the same weakness even after you patch a single host. Unknown or unmanaged assets (often called Shadow IT) are a common reason the same issues resurface.

Use a simple, repeatable triage model: focus first on externally exposed assets, high-value systems (identity, VPN, email, production), vulnerabilities with known exploits, and issues that enable remote code execution or privilege escalation. Then enforce patch SLAs and track progress using consistent metrics so remediation is steady, not reactive.

SynScan combines attack surface monitoring and continuous security auditing to keep your inventory current, flag high-impact vulnerabilities early, and help you turn raw findings into a practical remediation plan.