Zip -q -d log4j-core-*.jar org/apache/logging/log4j/core/lookup/JndiLookup.class Or remove the JndiLookup class from the classpath. ![]() If you are using log4j v2.10 or above, and cannot upgrade, then set the propertyģ. To mitigate the following options are available (see the advisory from Apache here □Ģ. It is not present in version 1 of log4j and is patched in 2.15.0.īut, if you work for a company that is using Java-based software that uses log4j you should immediately read the section on how to mitigate and protect your systems before reading the rest. It is CVE-2021-44228 and affects version 2 of log4j between versions 2.0-beta-9 and 2.14.1. ![]() Because of the widespread use of Java and log4j this is likely one of the most serious vulnerabilities on the Internet since both Heartbleed and ShellShock. This vulnerability allows an attacker to execute code on a remote server a so-called Remote Code Execution (RCE). Yesterday, December 9, 2021, a very serious vulnerability in the popular Java-based logging package Log4j was disclosed.
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