What is the CVSS score of CVE-2023-2758?

CVE-2023-2758 has a CVSS 3.1 base score of 5.3 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L. EPSS exploitation probability: 1.0%.

Is there a public PoC exploit available for CVE-2023-2758?

Yes, a public proof-of-concept exploit is available for CVE-2023-2758. Prioritise patching immediately. EPSS: 1.0%.

Conprosys Hmi System CVE-2023-2758

MEDIUM

Improper Control of Interaction Frequency (CWE-799)

2023-05-31 vulnreport@tenable.com

Denial Of Service Conprosys Hmi System Contec

5.3

CVSS 3.1 · NVD

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Vulnerability Assessment

Weakness	CWE CWE-799 OWASP Top 10:2025 A06:2025 - Insecure Design ASVS 5.0 V2 - Validation and Business Logic Interaction frequency control
Impact	CVSS score of 5.3 (MEDIUM). Attack characteristics: network attack vector, low complexity, no privileges required, no user interaction not required. Public proof-of-concept exploit code is available.
Exploit ScenarioDerived	This vulnerability can be exploited remotely over the network. Successful exploitation could compromise the medium-severity affected system.

This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).

No patch listed yet 1.0% exploitation probability (EPSS)

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AnalysisAI

A denial of service vulnerability exists in Contec CONPROSYS HMI System versions 3.5.2 and prior. Rated medium severity (CVSS 5.3), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

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 under CWE-799. A denial of service vulnerability exists in Contec CONPROSYS HMI System versions 3.5.2 and prior. When there is a time-zone mismatch in certain configuration files, a remote, unauthenticated attacker may deny logins for an extended period of time. Affected products include: Contec Conprosys Hmi System.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 5.3 MEDIUM

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

Low

DescriptionNVD

A denial of service vulnerability exists in Contec CONPROSYS HMI System versions 3.5.2 and prior. When there is a time-zone mismatch in certain configuration files, a remote, unauthenticated attacker may deny logins for an extended period of time.

Threat Intelligence Overview

EPSS Score

1.0%

Top 40% exploitable

Exploit

POC

Public exploit code exists

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 MEDIUM

CISA KEV No

Public POC Yes

EPSS 1.0%

Patch available No

Active threat No

Deciding rule

MEDIUM severity (CVSS 4.0-6.9)

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

Poc

System Exposure· derived

Open

Automatable· derived

Yes

Human Impact· derived

Medium

Priority Score

Low Medium High Critical

KEV: 0

EPSS: +1

CVSS: +26

PoC: +20

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Denial of Service MEDIUM

Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.

Affected Products (CPE)NVD

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

More in Conprosys Hmi System

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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-2023-28657 HIGH This Week

8.8 Jun 01

Improper access control vulnerability exists in CONPROSYS HMI System (CHS) versions prior to 3.5.3. Rated high 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

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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

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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-799 – Improper Control of Interaction Frequency

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8.7

8.7

8.7

8.7

8.2

8.1

Same technique Denial Of Service

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CVE-2015-5119 CRITICAL POC

9.8

CVE-2011-2462 CRITICAL POC

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CVE-2011-0611 HIGH POC

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CVE-2012-1889 HIGH POC

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CVE-2012-0507 CRITICAL POC

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CVE-2014-1761 HIGH POC

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CVE-2015-5122 CRITICAL POC

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CVE-2011-0609 HIGH POC

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References

Advisories & patches

REF https://jvn.jp/en/vu/JVNVU93372935/index.html

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