What is the CVSS score of CVE-2023-28657?

CVE-2023-28657 has a CVSS 3.1 base score of 8.8 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.7%.

Conprosys Hmi System CVE-2023-28657

HIGH

Missing Authorization (CWE-862)

2023-06-01 vultures@jpcert.or.jp

Authentication Bypass Conprosys Hmi System Contec

8.8

CVSS 3.1 · NVD

View

Vulnerability Assessment

Weakness	CWE CWE-862 OWASP Top 10:2025 A01:2025 - Broken Access Control ASVS 5.0 V8 - Authorization Authorization checks on every request MITRE ATT&CK 1 technique across 1 tactic: Privilege Escalation The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Impact	CVSS score of 8.8 (HIGH). Attack characteristics: network attack vector, low complexity, low privileges required, no user interaction not required.
Exploit ScenarioDerived	A remote attacker could access resources or perform actions without proper authorization checks by sending crafted requests to the affected application.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).

No patch listed yet 0.7% exploitation probability (EPSS)

Get an e-mail when this CVE is exploited, patched or re-scored. Free account.

Alert me

AnalysisAI

Improper access control vulnerability exists in CONPROSYS HMI System (CHS) versions prior to 3.5.3. Rated high severity (CVSS 8.8), this vulnerability is remotely exploitable, low attack complexity. No vendor patch available.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Implement role-based access control, validate authorization on every request server-side, apply principle of least privilege.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

This vulnerability is classified as Missing Authorization (CWE-862), which allows attackers to access resources or perform actions without proper authorization checks. Improper access control vulnerability exists in CONPROSYS HMI System (CHS) versions prior to 3.5.3. A user of the PC where the affected product is installed may gain an administrative privilege. As a result, information regarding the product may be obtained and/or altered by the user. Affected products include: Contec Conprosys Hmi System. Version information: prior to 3.5.3..

Know when Conprosys Hmi System gets its next vulnerability

Watch products and get an email when something new is published
Check this CVE against your own stack and servers
Exploit and PoC references, threat intelligence from 22 sources

Continue with Google Continue with GitHub

No credit card · 7-day full trial

Severity by source

NVD PRIMARY 8.8 HIGH

AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

DescriptionNVD

Improper access control vulnerability exists in CONPROSYS HMI System (CHS) versions prior to 3.5.3. A user of the PC where the affected product is installed may gain an administrative privilege. As a result, information regarding the product may be obtained and/or altered by the user.

Threat Intelligence Overview

EPSS Score

0.7%

Top 51% exploitable

Data Quality

2 sources

Confidence: Low

NVD

CVE.org

EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity HIGH

CISA KEV No

Public POC No

EPSS 0.7%

Patch available No

Active threat No

Deciding rule

HIGH severity (CVSS 7.0-8.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Scheduled

Exploitation· derived

None

System Exposure· derived

Open

Automatable· derived

Human Impact· derived

Medium

Priority Score

Low Medium High Critical

KEV: 0

EPSS: +1

CVSS: +44

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Authentication Bypass CRITICAL

Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.

Affected Products (CPE)NVD

cpe:2.3:a:contec:conprosys_hmi_system:*:*:*:*:*:*:*:*

More in Conprosys Hmi System

View all

CVE-2022-44456 CRITICAL Act Now

9.8 Dec 19

CONPROSYS HMI System (CHS) Ver.3.4.4?and earlier allows a remote unauthenticated attacker to execute an arbitrary OS com

CVE-2023-2758 MEDIUM This Month POC

5.3 May 31

A denial of service vulnerability exists in Contec CONPROSYS HMI System versions 3.5.2 and prior. Rated medium severity

CVE-2023-28713 HIGH This Week

8.1 Jun 01

Plaintext storage of a password exists in CONPROSYS HMI System (CHS) versions prior to 3.5.3. Rated high severity (CVSS

CVE-2023-28399 HIGH This Week

7.8 Jun 01

Incorrect permission assignment for critical resource exists in CONPROSYS HMI System (CHS) versions prior to 3.5.3. Rate

CVE-2025-34081 HIGH This Week

7.5 Jul 01

The Contec Co.,Ltd. CONPROSYS HMI System (CHS) exposes a PHP phpinfo() debug page to unauthenticated users that may cont

CVE-2023-22339 HIGH This Week

7.5 Jan 20

Improper access control vulnerability in CONPROSYS HMI System (CHS) Ver.3.4.5 and earlier allows a remote unauthenticate

CVE-2023-22331 HIGH This Week

7.5 Jan 20

Use of default credentials vulnerability in CONPROSYS HMI System (CHS) Ver.3.4.5 and earlier allows a remote unauthentic

CVE-2023-29154 HIGH This Week

7.2 Jun 01

SQL injection vulnerability exists in the CONPROSYS HMI System (CHS) versions prior to 3.5.3. Rated high severity (CVSS

CVE-2023-22324 MEDIUM This Month

6.5 Jan 30

SQL injection vulnerability in the CONPROSYS HMI System (CHS) Ver.3.5.0 and earlier allows a remote authenticated attack

CVE-2025-34080 MEDIUM This Month

6.1 Jul 01

The Contec Co.,Ltd. CONPROSYS HMI System (CHS) is vulnerable to Cross-Site Scripting (XSS) in the getqsetting.php functi

CVE-2023-22373 MEDIUM This Month

5.4 Jan 20

Cross-site scripting vulnerability in CONPROSYS HMI System (CHS) Ver.3.4.5 and earlier allows a remote authenticated att

CVE-2023-22334 MEDIUM This Month

5.3 Jan 20

Use of password hash instead of password for authentication vulnerability in CONPROSYS HMI System (CHS) Ver.3.4.5 and ea

Same weakness CWE-862 – Missing Authorization

View all

CVE-2023-52163 HIGH POC

8.8

CVE-2025-6205 CRITICAL POC

9.1

CVE-2025-20362 HIGH POC

8.6

CVE-2017-9232 CRITICAL POC

9.8

CVE-2023-6875 CRITICAL POC

9.8

CVE-2024-4898 CRITICAL POC

9.8

CVE-2023-32117 CRITICAL POC

9.8

CVE-2020-36719 CRITICAL POC

9.8

Same technique Authentication Bypass

View all

CVE-2015-3306 CRITICAL POC

10.0

CVE-2023-22515 CRITICAL POC

9.8

CVE-2012-4681 CRITICAL POC

9.8

CVE-2013-2465 CRITICAL POC

9.8

CVE-2011-3544 CRITICAL POC

9.8

CVE-2022-40684 CRITICAL POC

9.8

CVE-2025-61882 CRITICAL POC

9.8

CVE-2024-0012 CRITICAL POC

9.3

References

Advisories & patches

ADVISORY https://www.contec.com/api/downloadlogger?download=/-/media/Contec/jp/support/security-info/contec_security_chs_230531_en.pdf ADVISORY https://www.contec.com/jp/api/downloadlogger?download=/-/media/Contec/jp/support/security-info/contec_security_chs_230531_jp.pdf REF https://jvn.jp/en/vu/JVNVU93372935/

Search Externally

GitHub PoC

Exploit-DB PacketStorm Snyk Rapid7 Nuclei Templates Trickest PoC

Back