Users of such products and services should refer to the vendors of these products/services for security updates. In order for vulnerabilities to be remediated in products and services that use affected versions of Log4j, the maintainers of those products and services must implement these security updates. See CISA's joint Alert AA21-356A: Mitigating Log4Shell and Other Log4j-Related Vulnerabilities for more information. (Updated December 28, 2021)Organizations are urged to upgrade to Log4j 2.17.1 (Java 8), 2.12.4 (Java 7) and 2.3.2 (Java 6), and review and monitor the Apache Log4j Security Vulnerabilities webpage for updates and mitigation guidance. If an asset cannot be patched or mitigated, consider removing it from the network. If a product cannot be updated, you should apply the temporary mitigation measures from the list at Mitigating Log4Shell and Other Log4j-Related Vulnerabilities. Note: while certain mitigation measures, such as removing the vulnerable class, can prevent exploitation, tracking each asset’s mitigation status adds administrative overhead so patching is preferred. Patching over mitigation: If an update is available, it should be applied immediately.Organizations should continue to review the CISA log4j vulnerable software database and cross reference against used software. Newly vulnerable 3rd party software. Organizations may lack insight into certain applications, such as Software as a Service (SaaS) solutions and other cloud resources.High fidelity scanning. Consider using file system scanning scripts to identify vulnerable Log4j files or use vulnerability scanners that leverage file scanning.This should include scanning (network and host) and comparing installed software with software listed in CISA’s Log4j vulnerable software database. Continuous enumeration and analysis: Organizations need to perform comprehensive analysis to fully enumerate all Log4J vulnerabilities. For long term mitigation, ensure the prevalence of log4j in all assets is considered and accounted for, including internally developed software and non-internet facing technology stacks.
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