CVE-2023-22339Network attack vector

Private-key disclosure via web-accessible site certificate

Published Jan 20, 2023 · Updated Apr 3, 2025

Improper access control in CONPROSYS HMI System 3.4.5 and earlier allows remote attackers to obtain its HTTPS private key. The web interface exposes the site certificate used for HTTPS authentication, including its private key, without enforcing access restrictions. No authentication or user interaction is required, and possession of the key enables eavesdropping on other CHS communications that use the same HTTPS identity.

CVSS severity7.5
High
EPSS probability1.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in CONPROSYS HMI System 3.4.5 and earlier allows remote attackers to obtain its HTTPS private key. The web interface exposes the site certificate used for HTTPS authentication, including its private key, without enforcing access restrictions. No authentication or user interaction is required, and possession of the key enables eavesdropping on other CHS communications that use the same HTTPS identity.

The record

CVE
CVE-2023-22339
Published
Jan 20, 2023
Updated
Apr 3, 2025
Vendor
CONTEC Co., Ltd.
Product
CONPROSYS HMI System (CHS)
Classifications
CWE-284, T1552.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 20, 2023CVE publishedPublication date reported by the CVE source.
  2. Apr 3, 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?

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

  1. Affected versionversion=Ver.3.4.5 and earlier

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

CONTEC Co., Ltd. · CONPROSYS HMI System (CHS)version=Ver.3.4.5 and earlier

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
7.5NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-284Improper Access Control
T1552.004Unsecured Credentials: Private Keys

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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