CISA released multiple advisories mandating federal civilian agencies in the US apply patches before Christmas while several major tech companies like IBM, Cisco and VMware have raced to address Log4j vulnerabilities in their products. On Friday, security researchers online began tweeting about potential issues with 2.16.0, with some identifying the denial of service vulnerability.ĭiscussion about Log4j has dominated conversation all week. They noted that only the Log4j-core JAR file is impacted by CVE-2021-45105. When the logging configuration uses a non-default Pattern Layout with a Context Lookup (for example, $$ where they originate from sources external to the application such as HTTP headers or user input. "Apache Log4j2 versions 2.0-alpha1 through 2.16.0 did not protect from uncontrolled recursion from self-referential lookups. They said the severity is "high" and gave it a CVSS score of 7.5. US: Hundreds of millions of devices at riskĪpache said version 2.16 "does not always protect from infinite recursion in lookup evaluation" and explained that it is vulnerable to CVE-2021-45105, a denial of service vulnerability.So far, nearly half of corporate networks have been attacked.Security firm discovers new attack vector.Log4j zero-day: How to protect yourself.
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