CVE-2021-42645

Name: CVE-2021-42645
Creator: NVD / NIST
Published: 2022-05-10T12:15:08.477+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 10/10EPSS 4.19%

Last modified Jun 17, 2026

CVE-2021-42645 is a critical-severity vulnerability rated 10/10 on the CVSS scale. CMSimple_XH 1.7.4 is affected by a remote code execution (RCE) vulnerability. To exploit this vulnerability, an attacker must use the "File" parameter to upload a PHP payload to get a reverse shell from the vulnerable host.. EPSS estimates a 4.19% chance of exploitation in the next 30 days.

Description

CMSimple_XH 1.7.4 is affected by a remote code execution (RCE) vulnerability. To exploit this vulnerability, an attacker must use the "File" parameter to upload a PHP payload to get a reverse shell from the vulnerable host.

Metrics

CVSS 3.1

10/10

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

EPSS Probability

4.19%

89.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-434

Affected Software

Vendor	Product	Versions
Cmsimple-Xh	Cmsimple Xh	1.7.4

References

https://github.com/Net-hunter121/CMSimple_XH-Unauth-RCEExploit, Third Party Advisory
https://github.com/cmsimple-xh/cmsimple-xh/releases/tag/1.7.5Release Notes, Third Party Advisory
https://github.com/Net-hunter121/CMSimple_XH-Unauth-RCEExploit, Third Party Advisory
https://github.com/cmsimple-xh/cmsimple-xh/releases/tag/1.7.5Release Notes, Third Party Advisory

Timeline

Published: May 10, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-42645?

How severe is CVE-2021-42645?

CVE-2021-42645 has a CVSS score of 10/10 (CRITICAL severity). The EPSS model estimates a 4.19% probability of exploitation in the next 30 days.

How do I fix CVE-2021-42645?

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-2021-42645?

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

Scan your code now

Source: NVD / NIST