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CVE-2021-33191

30
FAUCET Score

CVE-2021-33191 is a critical vulnerability affecting Apache NiFi MiNiFi C++ versions 0.5.0 through 0.9.0. It allows an attacker to execute arbitrary commands with the same privileges as the application binary due to an insecure "agent-update" command within the c2 protocol. This vulnerability has a CVSS score of 9.8 (Critical) with a network attack vector and low attack complexity, enabling full compromise of confidentiality, integrity, and availability. While no active exploitation or public exploit code is currently reported, its critical severity and ease of exploitation warrant immediate patching to version 0.10.0 or later. Community discussion and media coverage for this CVE are minimal.

Impacted Technologies

VendorProductVersion(s)CPE
>= 0.5.0, < 0.10.0CPE matchmatch criteria
cpe:2.3:a:apache:nifi_minifi_c\+\+:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
4.02%
Probability of exploitation in next 30 days
EPSS Percentile
89.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0402 is in the 83rd percentile among its peer group of 36,862 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

lists.apache.org / thread.html/r6f27a2454f5f67dbe4e21c8eb1db537b01863a0bc3758f28aa60f032%40%3Cannounce.apache.org%3E
openwall.com / lists/oss-security/2021/08/24/1
Mailing ListThird Party Advisory
openwall.com / lists/oss-security/2021/08/24/1
Mailing ListThird Party Advisory