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https://issues.apache.org/jira/browse/CASSANDRA-17352?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17493908#comment-17493908
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Marcus Eriksson commented on CASSANDRA-17352:
---------------------------------------------

yes, 
https://github.com/apache/cassandra/blob/cassandra-3.0/src/java/org/apache/cassandra/config/Config.java#L329-L340
 - there are most likely other issues when running with 
{{enable_user_defined_functions_threads: false}}

> CVE-2021-44521: Apache Cassandra: Remote code execution for scripted UDFs
> -------------------------------------------------------------------------
>
>                 Key: CASSANDRA-17352
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-17352
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Feature/UDF
>            Reporter: Marcus Eriksson
>            Assignee: Marcus Eriksson
>            Priority: Normal
>             Fix For: 3.0.26, 3.11.12, 4.0.2
>
>
> When running Apache Cassandra with the following configuration:
> enable_user_defined_functions: true
> enable_scripted_user_defined_functions: true
> enable_user_defined_functions_threads: false 
> it is possible for an attacker to execute arbitrary code on the host. The 
> attacker would need to have enough permissions to create user defined 
> functions in the cluster to be able to exploit this. Note that this 
> configuration is documented as unsafe, and will continue to be considered 
> unsafe after this CVE.
> This issue is being tracked as CASSANDRA-17352
> Mitigation:
> Set `enable_user_defined_functions_threads: true` (this is default)
> or
> 3.0 users should upgrade to 3.0.26
> 3.11 users should upgrade to 3.11.12
> 4.0 users should upgrade to 4.0.2
> Credit:
> This issue was discovered by Omer Kaspi of the JFrog Security vulnerability 
> research team.



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