Technical Advisory: Zero-day critical vulnerability in Log4j2 exploited in the wild

On December 9, 2021, Apache disclosed CVE-2021-44228, a remote code execution vulnerability – assigned with a severity of 10 (the highest possible risk score). The source of the vulnerability is Log4j, a logging library commonly used by a wide range of applications, and specifically versions up to 2.14.1 (Note: this vulnerability is also known as Log4Shell).

Log4j is an open source library, part of the Apache Logging Services, written in Java. The original release of the Java Development Kit (JDK) did not include logging APIs, so Java logging libraries quickly gained popularity including Log4j. The Log4j library is widely used by other frameworks, such as Elasticsearch, Kafka and Flink, that are foundational for many popular web sites and services.

Java is a cross-platform framework, and this vulnerability is not limited to applications running on specific operating system. All applications using the framework running on operating systems such as Windows, Linux, macOS and FreeBSD are vulnerable. Java powers web cams, car navigation systems, DVD players and set-top boxes, various terminals, and even parking meters and medical devices.

As a result, this vulnerability has a very significant ripple effect on the software supply chain, and it is hard to predict the total

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