What’s Vulnerable › Vulnerabilities

CVE-2021-33191: MiNiFi CPP arbitrary script execution is possible on the agent's host machine through the c2 protocol

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 4.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-08-24 · updated 2026-06-17
• Weakness: CWE-78

Description

From Apache NiFi MiNiFi C++ version 0.5.0 the c2 protocol implements an "agent-update" command which was designed to patch the application binary. This "patching" command defaults to calling a trusted binary, but might be modified to an arbitrary value through a "c2-update" command. Said command is then executed using the same privileges as the application binary. This was addressed in version 0.10.0

Affected products

• Apache Software Foundation Apache NiFi MiNiFi C++: from 0.5.0 before 0.10.0 — fixed in 0.10.0

How to fix

Upgrade to a fixed version: Apache Software Foundation Apache NiFi MiNiFi C++ 0.10.0. Check the vendor advisory for mitigations.

References

• http://www.openwall.com/lists/oss-security/2021/08/24/1
• https://lists.apache.org/thread.html/r6f27a2454f5f67dbe4e21c8eb1db537b01863a0bc3758f28aa60f032%40%3Cannounce.apache.org%3E
• https://www.openwall.com/lists/oss-security/2021/08/24/1
• http://www.openwall.com/lists/oss-security/2021/08/24/1
• https://lists.apache.org/thread.html/r6f27a2454f5f67dbe4e21c8eb1db537b01863a0bc3758f28aa60f032%40%3Cannounce.apache.org%3E
• https://www.openwall.com/lists/oss-security/2021/08/24/1

Get alerted when CVE-2021-33191 or the next vulnerability affects your stack