CVE-2021-31314Public exploitNetwork attack vector

Host takeover via unrestricted PHP file upload

Published Jan 20, 2024 · Updated Jun 20, 2025

Unrestricted file upload in ejinshan Terminal Security System 8.0 and later allows remote attackers to write arbitrary server files via HTTP. The unauthenticated /inter/uploadFile.php endpoint accepts a caller-controlled savepath and PHP file without validating authorization, path, or file type. The uploaded file is not directly web-accessible, but chaining /inter/ajax.php file inclusion executes it as a web shell and grants control of the host.

CVSS severity9.8
Critical
EPSS probability0.74%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unrestricted file upload in ejinshan Terminal Security System 8.0 and later allows remote attackers to write arbitrary server files via HTTP. The unauthenticated /inter/uploadFile.php endpoint accepts a caller-controlled savepath and PHP file without validating authorization, path, or file type. The uploaded file is not directly web-accessible, but chaining /inter/ajax.php file inclusion executes it as a web shell and grants control of the host.

The record

CVE
CVE-2021-31314
Published
Jan 20, 2024
Updated
Jun 20, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-434, T1505.003, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 20, 2024CVE publishedPublication date reported by the CVE source.
  2. Jun 20, 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-434Unrestricted Upload of File with Dangerous Type
T1505.003Server Software Component: Web Shell
T1190Exploit Public-Facing Application

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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