CVE-2021-22858Network attack vector

Authenticated code execution via unrestricted file upload

Published Feb 17, 2021 · Updated Sep 17, 2024

Unrestricted file upload in ChanGate Property Management System 1.00 allows remote authenticated users to execute code on the hosting server. Account-level access reaches upload fields whose misconfigured file-type filter accepts unrestricted executable files. A valid low-privilege account is required; a successful upload grants access to the hosting machine and permits arbitrary command or file execution.

CVSS severity8.8
High
EPSS probability1.23%
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 ChanGate Property Management System 1.00 allows remote authenticated users to execute code on the hosting server. Account-level access reaches upload fields whose misconfigured file-type filter accepts unrestricted executable files. A valid low-privilege account is required; a successful upload grants access to the hosting machine and permits arbitrary command or file execution.

The record

CVE
CVE-2021-22858
Published
Feb 17, 2021
Updated
Sep 17, 2024
Vendor
ChanGate EnterPrise Co., Ltd
Product
Property Management System
Classifications
CWE-287, CWE-434, T1068
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 17, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=1.00

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

ChanGate EnterPrise Co., Ltd · Property Management Systemversion=0 <=1.00

Published CVSS scores

8.8TWCERT/CCCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
6.5NIST NVDAV: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-287Improper Authentication
CWE-434Unrestricted Upload of File with Dangerous Type
T1068Exploitation for Privilege Escalation

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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