CVE-2021-34257

Name: CVE-2021-34257
Creator: NVD / NIST
Published: 2022-03-31T16:15:07.513+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 1.71%

Last modified Jun 17, 2026

CVE-2021-34257 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. Multiple Remote Code Execution (RCE) vulnerabilities exist in WPanel 4 4.3.1 and below via a malicious PHP file upload to (1) Dashboard's Avatar image, (2) Posts Folder image, (3) Pages Folder image and (4) Gallery Folder image.. EPSS estimates a 1.71% chance of exploitation in the next 30 days.

Description

Multiple Remote Code Execution (RCE) vulnerabilities exist in WPanel 4 4.3.1 and below via a malicious PHP file upload to (1) Dashboard's Avatar image, (2) Posts Folder image, (3) Pages Folder image and (4) Gallery Folder image.

Metrics

CVSS 3.1

8.8/10

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

EPSS Probability

1.71%

74.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-434

Affected Software

Vendor	Product	Versions
Wpanel Cms Project	Wpanel Cms	<= 4.3.1

References

https://github.com/Sentinal920/WPanel4-Authenticated-RCEExploit, Third Party Advisory
https://latestpcsolution.wordpress.com/2021/06/05/wpanel4-cms-authenticated-rce/Exploit, Third Party Advisory
https://github.com/Sentinal920/WPanel4-Authenticated-RCEExploit, Third Party Advisory
https://latestpcsolution.wordpress.com/2021/06/05/wpanel4-cms-authenticated-rce/Exploit, Third Party Advisory

Timeline

Published: Mar 31, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-34257?

How severe is CVE-2021-34257?

CVE-2021-34257 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 1.71% probability of exploitation in the next 30 days.

How do I fix CVE-2021-34257?

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-2021-34257?

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

Scan your code now

Source: NVD / NIST