CVE-2021-37770

Name: CVE-2021-37770
Creator: NVD / NIST
Published: 2022-06-30T15:15:07.947+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.2/10EPSS 1.07%

Last modified Jun 17, 2026

CVE-2021-37770 is a high-severity vulnerability rated 7.2/10 on the CVSS scale. Nucleus CMS v3.71 is affected by a file upload vulnerability. In this vulnerability, we can use upload to change the upload path to the path without the Htaccess file. EPSS estimates a 1.07% chance of exploitation in the next 30 days.

Description

Nucleus CMS v3.71 is affected by a file upload vulnerability. In this vulnerability, we can use upload to change the upload path to the path without the Htaccess file. Upload an Htaccess file and write it to AddType application / x-httpd-php.jpg. In this way, an attacker can upload a picture with shell, treat it as PHP, execute commands, so as to take down website resources.

Metrics

CVSS 3.1

7.2/10

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

EPSS Probability

1.07%

60.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-434

Affected Software

Vendor	Product	Versions
Nucleuscms	Nucleus Cms	3.71

References

https://github.com/NucleusCMS/NucleusCMS/issues/96Exploit, Issue Tracking, Third Party Advisory
https://shimo.im/docs/Ch9CphJt8XwTvQ3dExploit, Third Party Advisory
https://github.com/NucleusCMS/NucleusCMS/issues/96Exploit, Issue Tracking, Third Party Advisory
https://shimo.im/docs/Ch9CphJt8XwTvQ3dExploit, Third Party Advisory

Timeline

Published: Jun 30, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-37770?

How severe is CVE-2021-37770?

CVE-2021-37770 has a CVSS score of 7.2/10 (HIGH severity). The EPSS model estimates a 1.07% probability of exploitation in the next 30 days.

How do I fix CVE-2021-37770?

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-2021-37770?

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

Scan your code now

Source: NVD / NIST