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Apache Log4j2 Vulnerability

Released: Dec 10, 2021

Updated: Jun 27, 2022

Critical Severity

Apache Vendor

Vulnerability, Attack Type

RCE and DoS in Apache Java logging library

A 0-day exploit was discovered on a popular Java library Log4j2 that can result to a Remote Code Execution (RCE). This is a widely deployed library, and while systems protected by Fortinet Security Fabric are secured by the protections below, all systems need to upgrade ASAP as this is 10.0 severity. Due to the high visibility and attention, subsequent vulnerabilities have since emerged Learn More »


The Log4j2 is a Java-based logging utility that is part of the Apache Software. For more details on the background please read Fortinet Blog: https://www.fortinet.com/blog/threat-research/critical-apache-log4j-log4shell-vulnerability-what-you-need-to-know To view, Fortinet products impacted by this vulnerability, refer to: https://www.fortiguard.com/psirt/FG-IR-21-245 Technical information pertaining to each vulnerability, please refer to the FortiGuard Threat Signals at: https://www.fortiguard.com/threat-signal-report/4335 https://www.fortiguard.com/threat-signal-report/4339 https://www.fortiguard.com/threat-signal-report/4345 https://www.fortiguard.com/threat-signal-report/4360

Latest Development

Recent news and incidents related to cybersecurity threats encompassing various events such as data breaches, cyber-attacks, security incidents, and vulnerabilities discovered.

Dec 9th: A 0-day was posted on Twitter with a PoC posted in GitHub. On Dec 10, several security-related websites picked up the vulnerability and released an article.

Jun 27, 2022: Over 6 months later, stories of Log4j2 exploits continue to be published on near-daily basis and FortiGuard Labs continues to see active exploitation attempts. On a single day (Jun 14, 2022), FortiGuard IPS blocked over 50,000 exploits.

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Threat Intelligence

Information gathered from analyzing ongoing cybersecurity events including threat actors, their tactics, techniques, and procedures (TTPs), indicators of compromise (IOCs), malware and related vulnerabilities.

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