Log4Shell was a critical 2021 vulnerability in Apache Log4j that was actively exploited and prompted a coordinated international security response.

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Location PART 2 - FOUR HIDDEN CHIMNEYS CHAPTER 11: THE STONE OF TRIUMPH How to Count the Intangibles?

"Log4Shell was a critical 2021 vulnerability in Apache Log4j that was actively exploited and prompted a coordinated international security response."

The joint advisory describes Log4Shell as a critical remote-code-execution vulnerability, reports active exploitation and widespread scanning, and urges organizations to take immediate mitigation steps.

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Source title Mitigating Log4Shell and Other Log4j-Related Vulnerabilities

Source authors CISA, FBI, NSA, and international cybersecurity partners

Source year 2021

Confidence high

Importance high