Included in Log4j 1.2 is a SocketServer class that is vulnerable to deserialization of untrusted data which can be exploited to remotely execute arbitrary code when combined with a deserialization gadget when listening to untrusted network traffic for log data. This affects Log4j versions 1.2 up to 1.2.17.
Users are advised to migrate to org.apache.logging.log4j:log4j-core
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{ "nvd_published_at": "2019-12-20T17:15:00Z", "cwe_ids": [ "CWE-502" ], "severity": "CRITICAL", "github_reviewed": true, "github_reviewed_at": "2019-12-27T22:02:37Z" }