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CVE-2020-21514

26
FAUCET Score

CVE-2020-21514 describes a critical vulnerability in Fluent-ui v.1.2.2, specifically affecting fluentd and fluentd-ui, where a default password allows attackers to gain escalated privileges and execute arbitrary code. This high-severity vulnerability (CVSS 8.8) is easily exploitable over the network with low attack complexity and no user interaction, leading to complete compromise of confidentiality, integrity, and availability. While no public exploits, Metasploit modules, or Nuclei templates are currently available, and there is minimal community discussion or media coverage, the presence of a default password makes it a straightforward target for a determined attacker.

Impacted Technologies

VendorProductVersion(s)CPE
1.8.0CPE matchmatch criteria
cpe:2.3:a:fluentd:fluentd:1.8.0:-:*:*:*:*:*:*
1.2.2CPE matchmatch criteria
cpe:2.3:a:fluentd:fluentd-ui:1.2.2:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.8HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.79%
Probability of exploitation in next 30 days
EPSS Percentile
52.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0079 is in the 46th percentile among its peer group of 17,829 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.3 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Advisories (2)

rubygemsGHSA-wrxf-x8rm-6ggghigh

Fluent Fluentd and Fluent-ui use default password

Apr 4, 2023
redhatCVE-2020-21514Important

fluentd: Default admin credentials not required to change after installation

Apr 4, 2023

References

github.com / fluent/fluentd/issues/2722
ExploitIssue Tracking
github.com / fluent/fluentd-ui/issues/295