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Date: Fri, 11 Feb 2022 10:01:38 +0000
From: Marcus Eriksson <>
Subject: CVE-2021-44521: Apache Cassandra: Remote code execution for
 scripted UDFs 

Severity: high


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


Set `enable_user_defined_functions_threads: true` (this is default)
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


This issue was discovered by Omer Kaspi of the JFrog Security vulnerability research team.

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