CVE-2021-33191
This "patching" command defaults to calling a trusted binary, but might be modified to an arbitrary value through a "c2-update" command.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (4.02%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 4.02% probability · 91th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-78
- Affected
- apache/nifi minifi c\+\+
- Source
- security@apache.org
EPSS 4.0% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://www.openwall.com/lists/oss-security/2021/08/24/1Mailing List, Third Party Advisory
- https://lists.apache.org/thread.html/r6f27a2454f5f67dbe4e21c8eb1db537b01863a0bc3758f28aa60f032%40%3Cannounce.apache.org%3E
- https://www.openwall.com/lists/oss-security/2021/08/24/1Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2021/08/24/1Mailing List, Third Party Advisory
- https://lists.apache.org/thread.html/r6f27a2454f5f67dbe4e21c8eb1db537b01863a0bc3758f28aa60f032%40%3Cannounce.apache.org%3E
- https://www.openwall.com/lists/oss-security/2021/08/24/1Mailing List, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.