HIGH

CVE-2021-37770

CVSS v3

7.2

HIGH

EPSS Score

1.3 %

exploit probability, as of 2026-10-19

CISA KEV

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Neither OSV.dev nor the vendor advisories we read list affected versions for CVE-2021-37770 yet.

Full record on NVD

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.

Technical details

Published: 2022-06-30

Frequently asked questions

What is CVE-2021-37770?

Is CVE-2021-37770 actively exploited?

Active exploitation of CVE-2021-37770 has not been confirmed. Its EPSS score was 1.3% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-37770?

CVE-2021-37770 has a CVSS v3 base score of 7.2 (HIGH severity).

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