However, there are widespread reports of WAF Log4j signatures being bypassed. Many organizations will use WAF signatures to try and block exploits targeting this vulnerability. Attacks started before a Log4j patch was released. The high severity RCE vulnerability in the Java Log4j logging library allows an attacker to execute arbitrary code by getting a malicious string logged by a vulnerable Java application.ĬISA, the NCSC, and other industry bodies have observed mass exploitation of this vulnerability. A zero-day exploit of Apache Log4j 2 ('Log4Shell', CVE-2021-44228) was disclosed on 9 December 2021.
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