Remote Downgrade Vulnerability in libzmq Products by ZeroMQ

CVE-2014-9721

What is CVE-2014-9721?

Threat actors can exploit a flaw in libzmq versions prior to 4.0.6 and 4.1.x prior to 4.1.1, enabling them to execute downgrade attacks. These attacks exploit the ability to bypass crucial security mechanisms of the ZMTP v3 protocol by employing a ZMTP v2 or earlier header. This situation poses a significant risk as it allows attackers to manipulate the communication between systems, potentially leading to unauthorized access or execution of malicious commands.

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