What’s Vulnerable › Vulnerabilities

CVE-2023-2758: Contec CONPROSYS HMI System (CHS) v3.5.2 Denial of Service

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2023-05-31 · updated 2026-06-17
• Weakness: CWE-799

Description

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

• Contec Co., Ltd. CONPROSYS HMI System (CHS): before 3.5.3 — fixed in 3.5.3

How to fix

Upgrade to a fixed version: Contec Co., Ltd. CONPROSYS HMI System (CHS) 3.5.3. Check the vendor advisory for mitigations.

References

• https://jvn.jp/en/vu/JVNVU93372935/index.html
• https://www.tenable.com/security/research/tra-2023-21
• https://jvn.jp/en/vu/JVNVU93372935/index.html
• https://www.tenable.com/security/research/tra-2023-21

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