Log4j 1.2.17 used by zookeeper 3.6.1 is vulnerable to CVE-2019-17571

Hello everyone,

I work for a product which uses apache/zookeeper 3.6.1.  We scanned our product with a security scanner which reported CVE-2019-17571.

After analysis we found that this vulnerability is coming from zookeeper 3.6.1 because of direct dependency on log4j 1.2.17. 

Statement regarding 1.x version of log4j from official site:

A security vulnerability, CVE-2019-17571 has been identified against Log4j 1. Log4j includes a SocketServer that accepts serialized log events and deserializes them without verifying whether the objects are allowed or not. This can provide an attack vector that can be expoited. Since Log4j 1 is no longer maintained this issue will not be fixed. Users are urged to upgrade to Log4j 2.x

Could you please share your rationale on not upgrading log4j to 2.x