Vulnerability Database

383,371

Total vulnerabilities in the database

CVE-2021-44228 — apache / log4j

Improper Neutralization of Special Elements used in an Expression Language Statement ('Expression Language Injection')

Apache Log4j2 2.0-beta9 through 2.15.0 (excluding security releases 2.12.2, 2.12.3, and 2.3.1) JNDI features used in configuration, log messages, and parameters do not protect against attacker controlled LDAP and other JNDI related endpoints. An attacker who can control log messages or log message parameters can execute arbitrary code loaded from LDAP servers when message lookup substitution is enabled. From log4j 2.15.0, this behavior has been disabled by default. From version 2.16.0 (along with 2.12.2, 2.12.3, and 2.3.1), this functionality has been completely removed. Note that this vulnerability is specific to log4j-core and does not affect log4net, log4cxx, or other Apache Logging Services projects.

CVSS v3:

  • Severity: Critical
  • Score: 10
  • AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:H

CVSS v2:

  • Severity: High
  • Score: 9.3
  • AV:N/AC:M/Au:N/C:C/I:C/A:C
Software Affected versions
apache / log4j >= 2.13.0, < 2.15.0
apache / log4j >= 2.0.1, < 2.3.1
apache / log4j >= 2.4.0, < 2.12.2
siemens / logo!_soft_comfort All versions
siemens / spectrum_power_4 < 4.70
siemens / siveillance_control_pro All versions
siemens / head-end_system_universal_device_integration_system All versions
siemens / gma-manager < 8.6.2j-398
siemens / e-car_operation_center < 2021-12-13
siemens / navigator < 2021-12-13
siemens / vesys < 2019.1
siemens / teamcenter All versions
siemens / spectrum_power_7 < 2.30
siemens / solid_edge_harness_design < 2020
siemens / solid_edge_cam_pro All versions
siemens / siveillance_viewpoint All versions
siemens / siveillance_vantage All versions
siemens / nx All versions
siemens / mendix All versions
siemens / industrial_edge_management_hub < 2021-12-13
siemens / industrial_edge_management All versions
cisco / webex_meetings_server < 3.0
cisco / identity_services_engine < 2.4.0
cisco / data_center_network_manager < 11.3\(1\)
cisco / unified_contact_center_express < 12.5\(1\)
cisco / finesse < 12.6\(1\)
cisco / nexus_dashboard < 2.1.2
cisco / network_services_orchestrator >= 5.6, < 5.6.3.1
cisco / network_services_orchestrator >= 5.5, < 5.5.4.1
cisco / network_services_orchestrator < 5.3.5.1
cisco / intersight_virtual_appliance < 1.0.9-361
cisco / network_services_orchestrator >= 5.4, < 5.4.5.2
cisco / dna_spaces-_connector < 2.5
cisco / cyber_vision_sensor_management_extension < 4.0.3
cisco / crosswork_zero_touch_provisioning < 2.0.1
cisco / crosswork_platform_infrastructure < 4.0.1
cisco / crosswork_optimization_engine < 2.0.1
cisco / crosswork_network_controller < 2.0.1
cisco / crosswork_data_gateway < 2.0.2
cisco / common_services_platform_collector >= 2.10.0, < 2.10.0.1
cisco / common_services_platform_collector < 2.9.1.3
cisco / cloudcenter < 4.10.0.16
cisco / cloudcenter_workload_manager < 5.5.2
cisco / cloudcenter_suite_admin < 5.3.1
cisco / cloudcenter_cost_optimizer < 5.5.2
cisco / business_process_automation >= 3.2.000.000, < 3.2.000.009
cisco / business_process_automation >= 3.1.000.000, < 3.1.000.044
cisco / business_process_automation < 3.0.000.115
cisco / automated_subsea_tuning < 2.1.0
cisco / nexus_insights < 6.0.2
cisco / advanced_malware_protection_virtual_private_cloud_appliance < 3.5.4
cisco / customer_experience_cloud_agent < 1.12.1
cisco / workload_optimization_manager < 3.2.1
cisco / ucs_central < 2.0\(1p\)
cisco / ucs_director < 6.8.2.0
cisco / sd-wan_vmanage < 20.3.4.1
cisco / optical_network_controller < 1.1.0
cisco / dna_center >= 2.2.3.0, < 2.2.3.4
cisco / sd-wan_vmanage >= 20.4, < 20.4.2.1
cisco / integrated_management_controller_supervisor < 2.3.2.1
cisco / wan_automation_engine < 7.3.0.2
cisco / virtualized_infrastructure_manager >= 3.4.0, < 3.4.4
cisco / sd-wan_vmanage >= 20.5, < 20.5.1.1
cisco / network_assurance_engine < 6.0.2
cisco / virtualized_infrastructure_manager < 3.2.0
cisco / dna_center < 2.1.2.8
cisco / sd-wan_vmanage >= 20.6, < 20.6.2.1
cisco / virtual_topology_system < 2.6.7
cisco / dna_center >= 2.2.2.0, < 2.2.2.8
cisco / smart_phy < 3.2.1
cisco / prime_service_catalog < 12.1
cisco / video_surveillance_operations_manager < 7.14.4
cisco / unity_connection < 11.5\(1\)
cisco / virtualized_voice_browser < 12.5\(1\)
cisco / unified_workforce_optimization < 11.5\(1\)
cisco / unified_sip_proxy < 10.2.1v2
cisco / unified_intelligence_center < 12.6\(1\)
cisco / unified_customer_voice_portal < 11.6
cisco / unified_contact_center_enterprise < 11.6\(2\)
cisco / unified_communications_manager_im_and_presence_service < 11.5\(1\)
cisco / unified_communications_manager < 11.5\(1\)
cisco / paging_server < 14.4.1
cisco / packaged_contact_center_enterprise < 11.6
cisco / enterprise_chat_and_email < 12.0\(1\)
cisco / emergency_responder < 11.5\(4\)
cisco / contact_center_management_portal < 12.5\(1\)
cisco / contact_center_domain_manager < 12.5\(1\)
cisco / cloud_connect < 12.6\(1\)
cisco / broadworks < 2021.11_1.162
snowsoftware / vm_access_proxy < 3.6
snowsoftware / snow_commander < 8.10.0
Maven icon org.apache.logging.log4j / log4j-core >= 2.13.0, < 2.15.0
Maven icon org.apache.logging.log4j / log4j-core >= 2.4, < 2.12.2
apple / xcode < 13.3
siemens / 6bk1602-0aa12-0tp0_firmware < 2.7.0
siemens / 6bk1602-0aa22-0tp0_firmware < 2.7.0
siemens / 6bk1602-0aa32-0tp0_firmware < 2.7.0
siemens / 6bk1602-0aa42-0tp0_firmware < 2.7.0
siemens / 6bk1602-0aa52-0tp0_firmware < 2.7.0
siemens / capital < 2019.1
siemens / mindsphere < 2021-12-16
siemens / opcenter_intelligence >= 3.2, < 3.5
siemens / comos < 10.4.2
siemens / energyip_prepay < 3.8.0.12
siemens / siguard_dsa >= 4.2, < 4.4.1
intel / datacenter_manager < 5.1
sonicwall / email_security < 10.0.13
bentley / synchro >= 6.1, < 6.2.4.2
bentley / synchro_4d < 6.4.3.2
Maven icon org.apache.logging.log4j / log4j-core >= 2.0-beta9, < 2.3.1
Maven icon org.ops4j.pax.logging / pax-logging-log4j2 >= 1.8.0, < 1.9.2
Maven icon org.ops4j.pax.logging / pax-logging-log4j2 >= 1.10.0, < 1.10.8
Maven icon org.ops4j.pax.logging / pax-logging-log4j2 >= 1.11.0, < 1.11.10
Maven icon org.ops4j.pax.logging / pax-logging-log4j2 >= 2.0.0, < 2.0.11
Maven icon com.guicedee.services / log4j-core <= 1.2.1.2-jre17
Maven icon org.xbib.elasticsearch / log4j = 6.3.2.1
Maven icon uk.co.nichesolutions.logging.log4j / log4j-core = 2.6.3-custom
apache / log4j = 2.0
apache / log4j = 2.0-beta9
apache / log4j = 2.0-rc1
apache / log4j = 2.0-rc2
siemens / capital = 2019.1
siemens / capital = 2019.1-sp1912
siemens / desigo_cc_advanced_reports = 3.0
siemens / desigo_cc_advanced_reports = 4.0
siemens / desigo_cc_advanced_reports = 4.1
siemens / desigo_cc_advanced_reports = 4.2
siemens / desigo_cc_advanced_reports = 5.0
siemens / desigo_cc_advanced_reports = 5.1
siemens / desigo_cc_info_center = 5.0
siemens / desigo_cc_info_center = 5.1
siemens / energy_engage = 3.1
siemens / energyip = 8.5
siemens / energyip = 8.6
siemens / energyip = 8.7
siemens / energyip = 9.0
siemens / operation_scheduler <= 1.1.3
siemens / sentron_powermanager = 4.1
siemens / sentron_powermanager = 4.2
siemens / sipass_integrated = 2.80
siemens / sipass_integrated = 2.85
siemens / siveillance_command <= 4.16.2.1
siemens / siveillance_identity = 1.5
siemens / siveillance_identity = 1.6
siemens / solid_edge_harness_design = 2020
siemens / solid_edge_harness_design = 2020-sp2002
siemens / spectrum_power_4 = 4.70
siemens / spectrum_power_4 = 4.70-sp7
siemens / spectrum_power_4 = 4.70-sp8
siemens / spectrum_power_7 = 2.30
siemens / spectrum_power_7 = 2.30-sp2
siemens / vesys = 2019.1
siemens / vesys = 2019.1-sp1912
siemens / vesys = 2020.1
siemens / vesys = 2021.1
debian / debian_linux = 9.0
debian / debian_linux = 10.0
debian / debian_linux = 11.0
fedoraproject / fedora = 34
fedoraproject / fedora = 35
cisco / crosswork_data_gateway = 3.0.0
cisco / crosswork_network_controller = 3.0.0
cisco / crosswork_optimization_engine = 3.0.0
cisco / crosswork_platform_infrastructure = 4.1.0
cisco / crosswork_zero_touch_provisioning = 3.0.0
cisco / data_center_network_manager = 11.3(1)
cisco / evolved_programmable_network_manager <= 4.1.1
cisco / finesse = 12.6(1)
cisco / identity_services_engine = 2.4.0
cisco / packaged_contact_center_enterprise = 11.6(1)
cisco / unified_communications_manager = 11.5(1)
cisco / unified_communications_manager = 11.5(1)su3
cisco / unified_communications_manager_im_and_presence_service = 11.5(1)
cisco / unified_contact_center_enterprise = 11.6(2)
cisco / unified_customer_voice_portal = 11.6
cisco / unified_customer_voice_portal = 12.0
cisco / unified_customer_voice_portal = 12.5
cisco / webex_meetings_server = 3.0
cisco / webex_meetings_server = 3.0-maintenance_release1
cisco / webex_meetings_server = 3.0-maintenance_release2
cisco / webex_meetings_server = 3.0-maintenance_release3
cisco / webex_meetings_server = 3.0-maintenance_release3_security_patch4
cisco / webex_meetings_server = 3.0-maintenance_release3_security_patch5
cisco / webex_meetings_server = 3.0-maintenance_release3_service_pack_2
cisco / webex_meetings_server = 3.0-maintenance_release3_service_pack_3
cisco / webex_meetings_server = 3.0-maintenance_release4
cisco / webex_meetings_server = 4.0
cisco / webex_meetings_server = 4.0-maintenance_release1
cisco / webex_meetings_server = 4.0-maintenance_release2
cisco / webex_meetings_server = 4.0-maintenance_release3
cisco / fxos = 6.2.3
cisco / fxos = 6.3.0
cisco / fxos = 6.4.0
cisco / fxos = 6.5.0
cisco / fxos = 6.6.0
cisco / fxos = 6.7.0
cisco / fxos = 7.0.0
cisco / fxos = 7.1.0
cisco / automated_subsea_tuning = 02.01.00
cisco / cloudcenter_suite = 4.10.0.15
cisco / cloudcenter_suite = 5.3.0
cisco / cloudcenter_suite = 5.4.1
cisco / cloudcenter_suite = 5.5.0
cisco / cloudcenter_suite = 5.5.1
cisco / common_services_platform_collector = 002.009(000.000)
cisco / common_services_platform_collector = 002.009(000.001)
cisco / common_services_platform_collector = 002.009(000.002)
cisco / common_services_platform_collector = 002.009(001.000)
cisco / common_services_platform_collector = 002.009(001.001)
cisco / common_services_platform_collector = 002.009(001.002)
cisco / common_services_platform_collector = 002.010(000.000)
cisco / crosswork_network_automation = 2.0.0
cisco / crosswork_network_automation = 3.0.0
cisco / crosswork_network_automation = 4.1.0
cisco / crosswork_network_automation = 4.1.1
cisco / cx_cloud_agent = 001.012
cisco / cyber_vision = 4.0.2
cisco / cyber_vision_sensor_management_extension = 4.0.2
cisco / dna_center = 2.2.2.8
cisco / emergency_responder = 11.5
cisco / emergency_responder = 11.5(4.65000.14)
cisco / emergency_responder = 11.5(4.66000.14)
cisco / enterprise_chat_and_email = 12.0(1)
cisco / enterprise_chat_and_email = 12.5(1)
cisco / enterprise_chat_and_email = 12.6(1)
cisco / evolved_programmable_network_manager = 3.0
cisco / evolved_programmable_network_manager = 3.1
cisco / evolved_programmable_network_manager = 4.0
cisco / evolved_programmable_network_manager = 4.1
cisco / evolved_programmable_network_manager = 5.0
cisco / evolved_programmable_network_manager = 5.1
cisco / finesse = 12.5(1)-su1
cisco / finesse = 12.5(1)-su2
cisco / finesse = 12.6(1)-es01
cisco / finesse = 12.6(1)-es02
cisco / finesse = 12.6(1)-es03
cisco / identity_services_engine = 002.004(000.914)
cisco / identity_services_engine = 002.006(000.156)
cisco / identity_services_engine = 002.007(000.356)
cisco / identity_services_engine = 003.000(000.458)
cisco / identity_services_engine = 003.001(000.518)
cisco / identity_services_engine = 003.002(000.116)
cisco / integrated_management_controller_supervisor = 002.003(002.000)
cisco / integrated_management_controller_supervisor = 2.3.2.0
cisco / intersight_virtual_appliance = 1.0.9-343
cisco / network_assurance_engine = 6.0(2.1912)
cisco / network_dashboard_fabric_controller = 11.0(1)
cisco / network_dashboard_fabric_controller = 11.1(1)
cisco / network_dashboard_fabric_controller = 11.2(1)
cisco / network_dashboard_fabric_controller = 11.3(1)
cisco / network_dashboard_fabric_controller = 11.4(1)
cisco / network_dashboard_fabric_controller = 11.5(1)
cisco / network_dashboard_fabric_controller = 11.5(2)
cisco / network_dashboard_fabric_controller = 11.5(3)
cisco / network_insights_for_data_center = 6.0(2.1914)
cisco / optical_network_controller = 1.1
cisco / paging_server = 8.3(1)
cisco / paging_server = 8.4(1)
cisco / paging_server = 8.5(1)
cisco / paging_server = 9.0(1)
cisco / paging_server = 9.0(2)
cisco / paging_server = 9.1(1)
cisco / paging_server = 12.5(2)
cisco / paging_server = 14.0(1)
cisco / prime_service_catalog = 12.1
cisco / sd-wan_vmanage = 20.3
cisco / sd-wan_vmanage = 20.4
cisco / sd-wan_vmanage = 20.5
cisco / sd-wan_vmanage = 20.6
cisco / sd-wan_vmanage = 20.6.1
cisco / sd-wan_vmanage = 20.7
cisco / sd-wan_vmanage = 20.8
cisco / secure_firewall_threat_defense = 6.2.3
cisco / secure_firewall_threat_defense = 6.3.0
cisco / secure_firewall_threat_defense = 6.4.0
cisco / secure_firewall_threat_defense = 6.5.0
cisco / secure_firewall_threat_defense = 6.6.0
cisco / secure_firewall_threat_defense = 6.7.0
cisco / secure_firewall_threat_defense = 7.0.0
cisco / secure_firewall_threat_defense = 7.1.0
cisco / smart_phy = 3.1.2
cisco / smart_phy = 3.1.3
cisco / smart_phy = 3.1.4
cisco / smart_phy = 3.1.5
cisco / smart_phy = 3.2.1
cisco / smart_phy = 21.3
cisco / ucs_central_software = 2.0
cisco / ucs_central_software = 2.0(1a)
cisco / ucs_central_software = 2.0(1b)
cisco / ucs_central_software = 2.0(1c)
cisco / ucs_central_software = 2.0(1d)
cisco / ucs_central_software = 2.0(1e)
cisco / ucs_central_software = 2.0(1f)
cisco / ucs_central_software = 2.0(1g)
cisco / ucs_central_software = 2.0(1h)
cisco / ucs_central_software = 2.0(1k)
cisco / ucs_central_software = 2.0(1l)
cisco / unified_communications_manager = 11.5(1.17900.52)
cisco / unified_communications_manager = 11.5(1.18119.2)
cisco / unified_communications_manager = 11.5(1.18900.97)
cisco / unified_communications_manager = 11.5(1.21900.40)
cisco / unified_communications_manager = 11.5(1.22900.28)
cisco / unified_communications_manager_im_&_presence_service = 11.5(1)
cisco / unified_communications_manager_im_&_presence_service = 11.5(1.22900.6)
cisco / unified_computing_system = 006.008(001.000)
cisco / unified_contact_center_enterprise = 12.0(1)
cisco / unified_contact_center_enterprise = 12.5(1)
cisco / unified_contact_center_enterprise = 12.6(1)
cisco / unified_contact_center_enterprise = 12.6(2)
cisco / unified_contact_center_express = 12.5(1)
cisco / unified_contact_center_express = 12.5(1)-su1
cisco / unified_contact_center_express = 12.6(1)
cisco / unified_contact_center_express = 12.6(2)
cisco / unified_contact_center_management_portal = 12.6(1)
cisco / unified_customer_voice_portal = 11.6(1)
cisco / unified_customer_voice_portal = 12.0(1)
cisco / unified_customer_voice_portal = 12.5(1)
cisco / unified_customer_voice_portal = 12.6(1)
cisco / unified_intelligence_center = 12.6(1)
cisco / unified_intelligence_center = 12.6(1)-es01
cisco / unified_intelligence_center = 12.6(1)-es02
cisco / unified_intelligence_center = 12.6(2)
cisco / unified_sip_proxy = 010.000(000)
cisco / unified_sip_proxy = 010.000(001)
cisco / unified_sip_proxy = 010.002(000)
cisco / unified_sip_proxy = 010.002(001)
cisco / unified_workforce_optimization = 11.5(1)-sr7
cisco / unity_connection = 11.5
cisco / unity_connection = 11.5(1.10000.6)
cisco / video_surveillance_manager = 7.14(1.26)
cisco / video_surveillance_manager = 7.14(2.26)
cisco / video_surveillance_manager = 7.14(3.025)
cisco / video_surveillance_manager = 7.14(4.018)
cisco / virtual_topology_system = 2.6.6
cisco / wan_automation_engine = 7.1.3
cisco / wan_automation_engine = 7.2.1
cisco / wan_automation_engine = 7.2.2
cisco / wan_automation_engine = 7.2.3
cisco / wan_automation_engine = 7.3
cisco / wan_automation_engine = 7.4
cisco / wan_automation_engine = 7.5
cisco / wan_automation_engine = 7.6
percussion / rhythmyx <= 7.3.2

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.