What is CVE-2020-21514?

CVE-2020-21514 is a high-severity vulnerability in Fluentd, classified under Incorrect Default Permissions. CVSS score: 8.8/10. Published 2023-04-04.

How severe is CVE-2020-21514?

High severity. CVSS v3 base score is 8.8 out of 10.

Vulnerability in Fluentd

CVE-2020-21514

An issue was discovered in Fluent-ui v.1.2.2 allows attackers to gain escalated privileges and execute arbitrary code due to a default password.

Published 2023-04-04 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.008 (54.5th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 54th percentile — 54.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

Fluentd — versions 1.8.0
Fluentd Fluentd-Ui — versions 1.2.2

Weakness classification (CWE)

CWE-276 — Incorrect Default Permissions

References

github.com/fluent/fluentd/issues/2722 (Exploit, Issue Tracking)
github.com/fluent/fluentd-ui/issues/295

Frequently asked questions

What is CVE-2020-21514?: CVE-2020-21514 is a high-severity vulnerability in Fluentd, classified under Incorrect Default Permissions. CVSS score: 8.8/10. Published 2023-04-04.
How severe is CVE-2020-21514?: High severity. CVSS v3 base score is 8.8 out of 10.