What is CVE-2021-42645?

CVE-2021-42645 is a critical-severity vulnerability in Cmsimple-xh Cmsimple_xh, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 10.0/10. Published 2022-05-10.

How severe is CVE-2021-42645?

Critical severity. CVSS v3 base score is 10.0 out of 10.

Arbitrary file upload in Cmsimple-xh Cmsimple_xh

CVE-2021-42645

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.

Vulnerability class: Unrestricted File Upload

EPSS: 0.042 (89.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 10.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.

Affected products

Cmsimple-xh Cmsimple_xh — versions 1.7.4
N/a — versions n/a

Weakness classification (CWE)

CWE-434 — Unrestricted Upload of File with Dangerous Type

References

cve@mitre.org (Exploit, Third Party Advisory, x_refsource_MISC)
cve@mitre.org (Third Party Advisory, x_refsource_MISC, Release Notes)

Frequently asked questions

What is CVE-2021-42645?: CVE-2021-42645 is a critical-severity vulnerability in Cmsimple-xh Cmsimple_xh, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 10.0/10. Published 2022-05-10.
How severe is CVE-2021-42645?: Critical severity. CVSS v3 base score is 10.0 out of 10.