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Based on the msg alone , would need:

sudo apt install zlib1g

Instead of:

sudo apt install zlib1g-dev

I'm surprised you got an answer as I was unable to get one over the weekend until ISC makes any official statement. However, re: the 1.x comment:

2031667 – (CVE-2021-4104) CVE-2021-4104 log4j: Remote code execution in Log4j 1.x when application is configured to use JMSAppender (redhat.com)

The only usage of log4j I could find within an ISC platform was on Clinical Viewer. Curious if you could share where it is otherwise seen as being used? Maybe compiled into one of their own libraries and not directly exposed however.

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