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Apache Log4j 2.x < 2.17.0 DoS Vulnerability (Windows, Dec 2021) - Version Check
Information
Severity
Severity
Family
Family
CVSSv2 Base
CVSSv2 Base
CVSSv2 Vector
CVSSv2 Vector
Solution Type
Solution Type
Created
Created
Modified
Modified
Summary
Apache Log4j is prone to a denial of service (DoS) vulnerability.
Insight
Insight
Apache Log4j2 did not protect from uncontrolled recursion from self-referential lookups. When the logging configuration uses a non-default Pattern Layout with a Context Lookup (for example, $${ctx:loginId}), attackers with control over Thread Context Map (MDC) input data can craft malicious input data that contains a recursive lookup, resulting in a StackOverflowError that will terminate the process.
Affected Software
Affected Software
Apache Log4j versions 2.0.x through 2.16.0.
Detection Method
Detection Method
Checks if a vulnerable version is present on the target host.
Solution
Solution
Update to version 2.17.0 or later.