CVE-2020-21474

Name: CVE-2020-21474
Creator: NVD / NIST
Published: 2023-06-20T15:15:11.337+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 1.17%

Last modified Jun 17, 2026

CVE-2020-21474 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. File Upload vulnerability in NucleusCMS v.3.71 allows a remote attacker to execute arbitrary code via the /nucleus/plugins/skinfiles/?dir=rsd parameter.. EPSS estimates a 1.17% chance of exploitation in the next 30 days.

Description

File Upload vulnerability in NucleusCMS v.3.71 allows a remote attacker to execute arbitrary code via the /nucleus/plugins/skinfiles/?dir=rsd parameter.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

1.17%

63.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Nucleuscms	Nucleuscms	3.71

References

https://github.com/NucleusCMS/NucleusCMS/issues/95Exploit, Issue Tracking
https://github.com/NucleusCMS/NucleusCMS/issues/95Exploit, Issue Tracking

Timeline

Published: Jun 20, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-21474?

File Upload vulnerability in NucleusCMS v.3.71 allows a remote attacker to execute arbitrary code via the /nucleus/plugins/skinfiles/?dir=rsd parameter.

How severe is CVE-2020-21474?

CVE-2020-21474 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.17% probability of exploitation in the next 30 days.

How do I fix CVE-2020-21474?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-21474?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST