HOMEVULNERABILITIESCVE-2021-33191
CRITICAL

CVE-2021-33191

CWE-78Published: August 24, 2021· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official 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

NVD Source

Technical Analysis

CVE-2021-33191 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

Apache1 product(s)
nifi minifi c\+\+
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
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Official Patches & Advisories

ADVISORYhttp://www.openwall.com/lists/oss-security/2021/08/24/1
ADVISORYhttps://www.openwall.com/lists/oss-security/2021/08/24/1
ADVISORYhttp://www.openwall.com/lists/oss-security/2021/08/24/1
ADVISORYhttps://www.openwall.com/lists/oss-security/2021/08/24/1

All References (6)

→
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

Quick Facts

CVE IDCVE-2021-33191
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-78
CISA KEVNo
Affected1 vendor(s)
PublishedAug 24, 2021

Related CVEs (CWE-78)

CVE-2026-34234
KEV10.0
CVE-2023-3939
10.0
CVE-2008-7158
10.0
CVE-2019-5485
10.0
CVE-2026-41900
10.0
CVE-2023-3572
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-33191 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.
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