Log4Shell (CVE-2021-44228) is a vulnerability reported in November 2021 in Log4j, a popular Java logging framework, involving arbitrary code execution and exploited as a zero-day …

Log4Shell is a critical zero-day vulnerability (CVE-2021-44228) in Log4j that was uncovered in December 2021. It allows attackers to execute arbitrary code remotely on affected systems.

Log4Shell, also known as the Log4j vulnerability, is a remote code execution (RCE) vulnerability in some versions of the Apache Log4j 2 Java library. Log4Shell allows hackers to run virtually …

Jul 24, 2025 · What is Log4Shell and Why Does It Matter? Log4Shell is a software vulnerability (CVE-2021-44228) in Apache Log4j, a popular Java logging library vulnerability.

Oct 20, 2025 · The Log4Shell incident showed us how quickly our digital world can be threatened by a single vulnerability. But it also demonstrated the power of the open source community to …

Oct 23, 2024 · In December 2021, a critical security vulnerability named Log4Shell was discovered in the Log4j library, a logging tool widely used in Java applications around the …

Resources from Palo Alto Networks to help security teams respond to the Log4j, also known as Log4Shell, vulnerability.