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    CVE-2021-45105

    Apache Log4j2 versions 2.0-alpha1 through 2.16.0 (excluding 2.12.3 and 2.3.1) did not protect from uncontrolled recursion from self-referential lookups. This allows an attacker with control over Thread Context Map data to cause a denial of service when a crafted string is interpreted. This issue was fixed in Log4j 2.17.0, 2.12.3, and 2.3.1.

    Published:Dec 18, 2021
    Last Modified:Aug 25, 2026
    EPS:Dec 18, 2021
    EPSS Score:0.99999
    CVSS Score:5.9

    Affected Products

    Vendor
    Apache
    Product
    Log4j
    Vendor
    Debian
    Product
    Debian Linux
    Vendor
    Netapp
    Product
    Cloud Manager
    Vendor
    Oracle
    Product
    Agile Engineering Data Management
    Vendor
    Oracle
    Product
    Agile Plm Mcad Connector
    Vendor
    Oracle
    Product
    Agile Product Lifecycle Management
    Vendor
    Oracle
    Product
    Autovue For Agile Product Lifecycle Management
    Vendor
    Oracle
    Product
    Banking Deposits And Lines Of Credit Servicing
    Vendor
    Oracle
    Product
    Banking Enterprise Default Management
    Vendor
    Oracle
    Product
    Banking Loans Servicing
    Vendor
    Oracle
    Product
    Banking Party Management
    Vendor
    Oracle
    Product
    Banking Payments
    Vendor
    Oracle
    Product
    Banking Platform
    Vendor
    Oracle
    Product
    Banking Trade Finance
    Vendor
    Oracle
    Product
    Banking Treasury Management
    Vendor
    Oracle
    Product
    Business Intelligence
    Vendor
    Oracle
    Product
    Communications Asap
    Vendor
    Oracle
    Product
    Communications Billing And Revenue Management
    Vendor
    Oracle
    Product
    Communications Cloud Native Core Console
    Vendor
    Oracle
    Product
    Communications Cloud Native Core Network Function Cloud Native Environment
    Vendor
    Oracle
    Product
    Communications Cloud Native Core Network Repository Function
    Vendor
    Oracle
    Product
    Communications Cloud Native Core Network Slice Selection Function
    Vendor
    Oracle
    Product
    Communications Cloud Native Core Policy
    Vendor
    Oracle
    Product
    Communications Cloud Native Core Security Edge Protection Proxy
    Vendor
    Oracle
    Product
    Communications Cloud Native Core Service Communication Proxy
    Vendor
    Oracle
    Product
    Communications Cloud Native Core Unified Data Repository
    Vendor
    Oracle
    Product
    Communications Convergence
    Vendor
    Oracle
    Product
    Communications Convergent Charging Controller
    Vendor
    Oracle
    Product
    Communications Diameter Signaling Router
    Vendor
    Oracle
    Product
    Communications Eagle Element Management System
    Vendor
    Oracle
    Product
    Communications Eagle Ftp Table Base Retrieval
    Vendor
    Oracle
    Product
    Communications Element Manager
    Vendor
    Oracle
    Product
    Communications Evolved Communications Application Server
    Vendor
    Oracle
    Product
    Communications Interactive Session Recorder
    Vendor
    Oracle
    Product
    Communications Ip Service Activator
    Vendor
    Oracle
    Product
    Communications Messaging Server
    Vendor
    Oracle
    Product
    Communications Network Charging And Control
    Vendor
    Oracle
    Product
    Communications Network Integrity
    Vendor
    Oracle
    Product
    Communications Performance Intelligence Center
    Vendor
    Oracle
    Product
    Communications Pricing Design Center
    Vendor
    Oracle
    Product
    Communications Service Broker
    Vendor
    Oracle
    Product
    Communications Services Gatekeeper
    Vendor
    Oracle
    Product
    Communications Session Report Manager
    Vendor
    Oracle
    Product
    Communications Session Route Manager
    Vendor
    Oracle
    Product
    Communications Unified Inventory Management
    Vendor
    Oracle
    Product
    Communications User Data Repository
    Vendor
    Oracle
    Product
    Communications Webrtc Session Controller
    Vendor
    Oracle
    Product
    Data Integrator
    Vendor
    Oracle
    Product
    E-business Suite
    Vendor
    Oracle
    Product
    Enterprise Manager Base Platform
    Vendor
    Oracle
    Product
    Enterprise Manager For Peoplesoft
    Vendor
    Oracle
    Product
    Enterprise Manager Ops Center
    Vendor
    Oracle
    Product
    Financial Services Analytical Applications Infrastructure
    Vendor
    Oracle
    Product
    Financial Services Model Management And Governance
    Vendor
    Oracle
    Product
    Flexcube Universal Banking
    Vendor
    Oracle
    Product
    Health Sciences Empirica Signal
    Vendor
    Oracle
    Product
    Health Sciences Inform
    Vendor
    Oracle
    Product
    Health Sciences Information Manager
    Vendor
    Oracle
    Product
    Healthcare Data Repository
    Vendor
    Oracle
    Product
    Healthcare Foundation
    Vendor
    Oracle
    Product
    Healthcare Master Person Index
    Vendor
    Oracle
    Product
    Healthcare Translational Research
    Vendor
    Oracle
    Product
    Hospitality Suite8
    Vendor
    Oracle
    Product
    Hospitality Token Proxy Service
    Vendor
    Oracle
    Product
    Hyperion Bi\+
    Vendor
    Oracle
    Product
    Hyperion Data Relationship Management
    Vendor
    Oracle
    Product
    Hyperion Infrastructure Technology
    Vendor
    Oracle
    Product
    Hyperion Planning
    Vendor
    Oracle
    Product
    Hyperion Profitability And Cost Management
    Vendor
    Oracle
    Product
    Hyperion Tax Provision
    Vendor
    Oracle
    Product
    Identity Management Suite
    Vendor
    Oracle
    Product
    Identity Manager Connector
    Vendor
    Oracle
    Product
    Instantis Enterprisetrack
    Vendor
    Oracle
    Product
    Insurance Data Gateway
    Vendor
    Oracle
    Product
    Insurance Insbridge Rating And Underwriting
    Vendor
    Oracle
    Product
    Jdeveloper
    Vendor
    Oracle
    Product
    Managed File Transfer
    Vendor
    Oracle
    Product
    Management Cloud Engine
    Vendor
    Oracle
    Product
    Mysql Enterprise Monitor
    Vendor
    Oracle
    Product
    Payment Interface
    Vendor
    Oracle
    Product
    Peoplesoft Enterprise Peopletools
    Vendor
    Oracle
    Product
    Primavera Gateway
    Vendor
    Oracle
    Product
    Primavera P6 Enterprise Project Portfolio Management
    Vendor
    Oracle
    Product
    Primavera Unifier
    Vendor
    Oracle
    Product
    Retail Back Office
    Vendor
    Oracle
    Product
    Retail Central Office
    Vendor
    Oracle
    Product
    Retail Customer Insights
    Vendor
    Oracle
    Product
    Retail Data Extractor For Merchandising
    Vendor
    Oracle
    Product
    Retail Eftlink
    Vendor
    Oracle
    Product
    Retail Financial Integration
    Vendor
    Oracle
    Product
    Retail Integration Bus
    Vendor
    Oracle
    Product
    Retail Invoice Matching
    Vendor
    Oracle
    Product
    Retail Merchandising System
    Vendor
    Oracle
    Product
    Retail Order Broker
    Vendor
    Oracle
    Product
    Retail Order Management System
    Vendor
    Oracle
    Product
    Retail Point-of-service
    Vendor
    Oracle
    Product
    Retail Predictive Application Server
    Vendor
    Oracle
    Product
    Retail Price Management
    Vendor
    Oracle
    Product
    Retail Returns Management
    Vendor
    Oracle
    Product
    Retail Service Backbone
    Vendor
    Oracle
    Product
    Retail Store Inventory Management
    Vendor
    Oracle
    Product
    Siebel Ui Framework
    Vendor
    Oracle
    Product
    Sql Developer
    Vendor
    Oracle
    Product
    Taleo Platform
    Vendor
    Oracle
    Product
    Utilities Framework
    Vendor
    Oracle
    Product
    Webcenter Portal
    Vendor
    Oracle
    Product
    Webcenter Sites
    Vendor
    Oracle
    Product
    Weblogic Server
    Vendor
    Redhat
    Product
    Amq Streams
    Vendor
    Redhat
    Product
    Camel Quarkus
    Vendor
    Redhat
    Product
    Integration
    Vendor
    Redhat
    Product
    Jboss Data Grid
    Vendor
    Redhat
    Product
    Jboss Enterprise Application Platform
    Vendor
    Redhat
    Product
    Jboss Fuse
    Vendor
    Redhat
    Product
    Logging
    Vendor
    Redhat
    Product
    Openshift
    Vendor
    Redhat
    Product
    Openshift Application Runtimes
    Vendor
    Redhat
    Product
    Red Hat Single Sign On
    Vendor
    Sonicwall
    Product
    6bk1602-0aa12-0tp0
    Vendor
    Sonicwall
    Product
    6bk1602-0aa12-0tp0 Firmware
    Vendor
    Sonicwall
    Product
    6bk1602-0aa22-0tp0
    Vendor
    Sonicwall
    Product
    6bk1602-0aa22-0tp0 Firmware
    Vendor
    Sonicwall
    Product
    6bk1602-0aa32-0tp0
    Vendor
    Sonicwall
    Product
    6bk1602-0aa32-0tp0 Firmware
    Vendor
    Sonicwall
    Product
    6bk1602-0aa42-0tp0
    Vendor
    Sonicwall
    Product
    6bk1602-0aa42-0tp0 Firmware
    Vendor
    Sonicwall
    Product
    6bk1602-0aa52-0tp0
    Vendor
    Sonicwall
    Product
    6bk1602-0aa52-0tp0 Firmware
    Vendor
    Sonicwall
    Product
    Email Security
    Vendor
    Sonicwall
    Product
    Network Security Manager
    Vendor
    Sonicwall
    Product
    Web Application Firewall

    Exploits

    https://github.com/aajuvonen/CVE-2021-45105-demohttps://github.com/cckuailong/Log4j_dos_CVE-2021-45105https://github.com/dileepdkumar/https-github.com-dileepdkumar-https-github.com-pravin-pp-log4j2-CVE-2021-45105https://github.com/dileepdkumar/https-github.com-dileepdkumar-https-github.com-pravin-pp-log4j2-CVE-2021-45105-vhttps://github.com/dileepdkumar/https-github.com-pravin-pp-log4j2-CVE-2021-45105https://github.com/dileepdkumar/https-github.com-pravin-pp-log4j2-CVE-2021-45105-1https://github.com/iAmSOScArEd/log4j2_dos_exploithttps://github.com/name/log4j-remediationhttps://github.com/pravin-pp/log4j2-CVE-2021-45105https://github.com/tejas-nagchandi/CVE-2021-45105

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-10 Buffer Overflow via Environment Variables
    CAPEC-101 Server Side Include (SSI) Injection
    CAPEC-104 Cross Zone Scripting
    CAPEC-108 Command Line Execution through SQL Injection
    CAPEC-109 Object Relational Mapping Injection
    CAPEC-110 SQL Injection through SOAP Parameter Tampering
    CAPEC-120 Double Encoding
    CAPEC-13 Subverting Environment Variable Values
    CAPEC-135 Format String Injection
    CAPEC-136 LDAP Injection
    CAPEC-14 Client-side Injection-induced Buffer Overflow
    CAPEC-153 Input Data Manipulation
    CAPEC-182 Flash Injection
    CAPEC-209 XSS Using MIME Type Mismatch
    CAPEC-22 Exploiting Trust in Client
    CAPEC-23 File Content Injection
    CAPEC-230 Serialized Data with Nested Payloads
    CAPEC-231 Oversized Serialized Data Payloads
    CAPEC-24 Filter Failure through Buffer Overflow
    CAPEC-250 XML Injection
    CAPEC-261 Fuzzing for garnering other adjacent user/sensitive data
    CAPEC-267 Leverage Alternate Encoding
    CAPEC-28 Fuzzing
    CAPEC-3 Using Leading 'Ghost' Character Sequences to Bypass Input Filters
    CAPEC-31 Accessing/Intercepting/Modifying HTTP Cookies
    CAPEC-42 MIME Conversion
    CAPEC-43 Exploiting Multiple Input Interpretation Layers
    CAPEC-45 Buffer Overflow via Symbolic Links
    CAPEC-46 Overflow Variables and Tags
    CAPEC-47 Buffer Overflow via Parameter Expansion
    CAPEC-473 Signature Spoof
    CAPEC-52 Embedding NULL Bytes
    CAPEC-53 Postfix, Null Terminate, and Backslash
    CAPEC-588 DOM-Based XSS
    CAPEC-63 Cross-Site Scripting (XSS)
    CAPEC-64 Using Slashes and URL Encoding Combined to Bypass Validation Logic
    CAPEC-664 Server Side Request Forgery
    CAPEC-67 String Format Overflow in syslog()
    CAPEC-7 Blind SQL Injection
    CAPEC-71 Using Unicode Encoding to Bypass Validation Logic
    CAPEC-72 URL Encoding
    CAPEC-73 User-Controlled Filename
    CAPEC-78 Using Escaped Slashes in Alternate Encoding
    CAPEC-79 Using Slashes in Alternate Encoding
    CAPEC-8 Buffer Overflow in an API Call
    CAPEC-80 Using UTF-8 Encoding to Bypass Validation Logic
    CAPEC-81 Web Server Logs Tampering
    CAPEC-83 XPath Injection
    CAPEC-85 AJAX Footprinting
    CAPEC-88 OS Command Injection
    CAPEC-9 Buffer Overflow in Local Command-Line Utilities

    Related CVEs

    CVE-2026-34481 (CVSS 6.3) — Apache Log4j's JsonTemplateLayout https://logging.apache.org/log4j/2.x/manual/json-template-layout.html , in …
    CVE-2026-34480 (CVSS 6.9) — Apache Log4j Core's XmlLayout https://logging.apache.org/log4j/2.x/manual/layouts.html#XmlLayout , in version…
    CVE-2026-34479 (CVSS 6.9) — The Log4j1XmlLayout from the Apache Log4j 1-to-Log4j 2 bridge fails to escape characters forbidden by the XML …
    CVE-2026-34478 (CVSS 6.9) — Apache Log4j Core's Rfc5424Layout https://logging.apache.org/log4j/2.x/manual/layouts.html#RFC5424Layout , in…
    CVE-2026-34477 (CVSS 6.3) — The fix for CVE-2025-68161 https://logging.apache.org/security.html#CVE-2025-68161 was incomplete: it addres…
    CVE-2025-68161 (CVSS 6.3) — The Socket Appender in Apache Log4j Core versions 2.0-beta9 through 2.25.2 does not perform TLS hostname verif…
    CVE-2023-26464 (CVSS 7.5) — ** UNSUPPORTED WHEN ASSIGNED ** When using the Chainsaw or SocketAppender components with Log4j 1.x on JRE le…
    CVE-2022-23305 (CVSS 9.8) — By design, the JDBCAppender in Log4j 1.2.x accepts an SQL statement as a configuration parameter where the val…
    CVE-2022-23302 (CVSS 8.8) — JMSSink in all versions of Log4j 1.x is vulnerable to deserialization of untrusted data when the attacker has …
    CVE-2022-23307 (CVSS 8.8) — CVE-2020-9493 identified a deserialization issue that was present in Apache Chainsaw. Prior to Chainsaw V2.0 C…

    References

    http://www.openwall.com/lists/oss-security/2021/12/19/1
    https://cert-portal.siemens.com/productcert/pdf/ssa-479842.pdf
    https://cert-portal.siemens.com/productcert/pdf/ssa-501673.pdf
    https://logging.apache.org/log4j/2.x/security.html
    https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0032
    https://security.netapp.com/advisory/ntap-20211218-0001/
    https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-log4j-qRuKNEbd
    https://www.debian.org/security/2021/dsa-5024
    https://www.kb.cert.org/vuls/id/930724
    https://www.oracle.com/security-alerts/cpuapr2022.html
    https://www.oracle.com/security-alerts/cpujan2022.html
    https://www.oracle.com/security-alerts/cpujul2022.html
    https://www.zerodayinitiative.com/advisories/ZDI-21-1541/
    http://www.openwall.com/lists/oss-security/2021/12/19/1
    https://cert-portal.siemens.com/productcert/pdf/ssa-479842.pdf
    https://cert-portal.siemens.com/productcert/pdf/ssa-501673.pdf
    https://logging.apache.org/log4j/2.x/security.html
    https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0032
    https://security.netapp.com/advisory/ntap-20211218-0001/
    https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-log4j-qRuKNEbd
    https://www.debian.org/security/2021/dsa-5024
    https://www.kb.cert.org/vuls/id/930724
    https://www.oracle.com/security-alerts/cpuapr2022.html
    https://www.oracle.com/security-alerts/cpujan2022.html
    https://www.oracle.com/security-alerts/cpujul2022.html
    https://www.zerodayinitiative.com/advisories/ZDI-21-1541/

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High