On December 9th, 2021, the security industry became aware of a new vulnerability, CVE-2021-44228. With a CVSS (Common Vulnerability Scoring System) score of a perfect 10.0, CVE-2021-442288 has the highest and most critical alert level.
To give some technical background, a flaw was found in the Java logging library “Apache Log4j 2” in versions from 2.0-beta9 to 2.14.1. This could allow a remote attacker to execute code on a server running Apache if the system logs an attacker-controlled string value with the attacker’s JNDI LDAP server lookup.
More simply put, this exploit would allow attackers to execute malicious code on Java applications, and as such, it poses a significant risk due to the prevalence of Log4j across the global software estate.
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