CVE-2021-38243Public exploitNetwork attack vector

Unauthenticated code execution via template variable overwrite

Published Sep 26, 2023 · Updated Jun 18, 2025

Remote code execution in XunRuiCMS 4.5.1 and earlier allows remote attackers to execute arbitrary code via a crafted GET request. The unauthenticated API template route lets GET parameters overwrite phpCMF_dir, select api_related.html, and pass a chosen callable to call_user_func_array. No account or user interaction is required; successful exploitation runs commands with the web server process permissions and can compromise hosted content and data.

CVSS severity9.8
Critical
EPSS probability1.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Remote code execution in XunRuiCMS 4.5.1 and earlier allows remote attackers to execute arbitrary code via a crafted GET request. The unauthenticated API template route lets GET parameters overwrite phpCMF_dir, select api_related.html, and pass a chosen callable to call_user_func_array. No account or user interaction is required; successful exploitation runs commands with the web server process permissions and can compromise hosted content and data.

The record

CVE
CVE-2021-38243
Published
Sep 26, 2023
Updated
Jun 18, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-94, T1190, T1059
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 26, 2023CVE publishedPublication date reported by the CVE source.
  2. Jun 18, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
T1190Exploit Public-Facing Application
T1059Command and Scripting Interpreter

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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