CVE-2021-42645

CRITICALNVD 10.010.0—

10.0

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.

CVSS v3: 10.0
EG Score: 10.0(medium)
EPSS: 91.7%
KEV: Not listed

Published

May 10, 2022

Last Modified

November 21, 2024

Advisory Details (2)

Auto-updated May 23, 2026

No patch confirmed yet.

generic

Release CMSimple_XH 1.7.5 · cmsimple-xh/cmsimple-xh · GitHub

https://github.com/cmsimple-xh/cmsimple-xh/releases/tag/1.7.5

generic

GitHub - Net-hunter121/CMSimple_XH-Unauth-RCE: hh · GitHub

https://github.com/Net-hunter121/CMSimple_XH-Unauth-RCE

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-434Unrestricted Upload of File with Dangerous Type

Data Freshness Timeline

(refreshed 11× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-04 13:10 UTCepss_batch
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2026-06-02 20:11 UTCepss_batch
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Frequently asked(5)

What is CVE-2021-42645?

CVE-2021-42645 is a critical vulnerability published on May 10, 2022. 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.

When was CVE-2021-42645 disclosed?

CVE-2021-42645 was first published in the National Vulnerability Database on May 10, 2022, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-42645 actively exploited?

CVE-2021-42645 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 91.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-42645?

CVE-2021-42645 has a CVSS v3 base score of 10.0 (NVD).

How do I remediate CVE-2021-42645?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-42645, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2021-42645

📅 Published

🔄 Last Modified

📋 Advisory Details (2)