CVE-2020-1960 Command injection in Apache Flink

What is CVE-2020-1960?

CVE-2020-1960 is a medium-severity vulnerability in Apache Flink, published on 14 May 2020. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

A vulnerability in Apache Flink (1.1.0 to 1.1.5, 1.2.0 to 1.2.1, 1.3.0 to 1.3.3, 1.4.0 to 1.4.2, 1.5.0 to 1.5.6, 1.6.0 to 1.6.4, 1.7.0 to 1.7.2, 1.8.0 to 1.8.3, 1.9.0 to 1.9.2, 1.10.0) where, when running a process with an enabled JMXReporter, with a port configured via metrics.reporter.reporter_name>.port, an attacker with local access to the machine and JMX port can execute a man-in-the-middle attack using a specially crafted request to rebind the JMXRMI registry to one under the attacker's control. This compromises any connection established to the process via JMX, allowing extraction of credentials and any other transferred data.

Which versions are affected by CVE-2020-1960?

5 open source packages ship an affected version, including org.apache.flink:flink-core and flink. It affects 1 product.

Products include Apache Flink.

How do I fix CVE-2020-1960?

Upgrade org.apache.flink:flink-core to a fixed version for your release line: 1.9.3 or 1.10.1.

Is CVE-2020-1960 being exploited?

There is no known exploitation of CVE-2020-1960 in the wild and no public exploit code.

Other vulnerabilities in Apache Flink

• CVE-2020-17519 Apache Flink Improper Access Control Exploited Critical 9.1
• CVE-2026-35194 Apache Flink: Remote code execution via SQL injection in code generation High 8.1
• CVE-2020-17518 Apache Flink directory traversal attack: remote file writing through the REST API High 7.5

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BIT-flink-2020-1960, GHSA-6g88-99wj-8mgg.