CVE-2021-43464Network attack vector

Remote code execution via eval in background field

Published Apr 4, 2022 · Updated Aug 4, 2024

Remote code execution in the background field of Intelliants Subrion CMS 4.2.1 allows remote authenticated users to execute code. The field-update handler evaluates modified background-field data with PHP eval(), treating attacker-controlled content as executable code. Exploitation requires a low-privilege authenticated account and network access, and successful execution can compromise confidentiality, integrity, and availability.

CVSS severity8.8
High
EPSS probability1.42%
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 the background field of Intelliants Subrion CMS 4.2.1 allows remote authenticated users to execute code. The field-update handler evaluates modified background-field data with PHP eval(), treating attacker-controlled content as executable code. Exploitation requires a low-privilege authenticated account and network access, and successful execution can compromise confidentiality, integrity, and availability.

The record

CVE
CVE-2021-43464
Published
Apr 4, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-78, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 4, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record 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 privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.8NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
6.5NVDAV:N/AC:L/Au:S/C:P/I:P/A:P

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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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