CVE-2020-21865

Name: CVE-2020-21865
Creator: NVD / NIST
Published: 2021-10-07T21:15:07.253+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 1.94%

Last modified Jun 17, 2026

CVE-2020-21865 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. ThinkPHP50-CMS v1.0 contains a remote code execution (RCE) vulnerability in the component /public/?s=captcha.. EPSS estimates a 1.94% chance of exploitation in the next 30 days.

Description

ThinkPHP50-CMS v1.0 contains a remote code execution (RCE) vulnerability in the component /public/?s=captcha.

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

1.94%

77.6th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Thinkphp50-Cms Project	Thinkphp50-Cms	1.0

References

https://github.com/nnngu/ThinkPHP50-CMS/issues/1Third Party Advisory
https://github.com/nnngu/ThinkPHP50-CMS/issues/1Third Party Advisory

Timeline

Published: Oct 7, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-21865?

ThinkPHP50-CMS v1.0 contains a remote code execution (RCE) vulnerability in the component /public/?s=captcha.

How severe is CVE-2020-21865?

CVE-2020-21865 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.94% probability of exploitation in the next 30 days.

How do I fix CVE-2020-21865?

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-2020-21865?

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

Scan your code now

Source: NVD / NIST