CVE-2020-21005

Name: CVE-2020-21005
Creator: NVD / NIST
Published: 2021-06-03T14:15:08.613+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 0.81%

Last modified Jun 17, 2026

CVE-2020-21005 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. WellCMS 2.0 beta3 is vulnerable to File Upload. A user can log in to the CMS background and upload a picture. EPSS estimates a 0.81% chance of exploitation in the next 30 days.

Description

WellCMS 2.0 beta3 is vulnerable to File Upload. A user can log in to the CMS background and upload a picture. Because the upload file type is controllable, the user can modify the upload file type to get webshell.

Metrics

CVSS 3.1

6.5/10

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

EPSS Probability

0.81%

52.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-434

Affected Software

Vendor	Product	Versions	Update
Wellcms	Wellcms	2.0	Beta3

References

http://www.wellcms.cn/read-27.html&&Vendor Advisory
https://github.com/Computer2200/-/issues/4Exploit, Third Party Advisory
http://www.wellcms.cn/read-27.html&&Vendor Advisory
https://github.com/Computer2200/-/issues/4Exploit, Third Party Advisory

Timeline

Published: Jun 3, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-21005?

How severe is CVE-2020-21005?

CVE-2020-21005 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.81% probability of exploitation in the next 30 days.

How do I fix CVE-2020-21005?

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-2020-21005?

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

Scan your code now

Source: NVD / NIST