Esper and log4j: What you need to know

A critical zero-day vulnerability called log4shell was discovered in the Apache log4j utility, allowing arbitrary code execution on affected systems, which could include essential internet infrastructure. While Esper believes that Android devices are unlikely to be exploited due to the absence of native support for the Java Naming and Directory Interface (JNDI) and the common use of Android's own logging library, they advise customers to remain vigilant. The vulnerability poses a greater risk to web servers, regardless of the operating system on which applications run. Despite not primarily using Java for backend services, Esper identified and patched vulnerable open-source components like Apache Flink within their infrastructure, ensuring no customer-facing systems were compromised. They are committed to deploying further patches as they become available and will continue monitoring the situation to safeguard their systems against log4shell.

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