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Delta Electronics reports DIALink vulnerabilities

Source Decision Insights Threat Desk Published September 16, 2025 Companies 5
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5 companies named across 10 categories, one of 20 articles referencing DELTA. Previous coverage: Fujitsu's AI efficiency technology and Gigamon Insights launch (Sep 2025).

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1. EXECUTIVE SUMMARY

2. RISK EVALUATION

Successful exploitation of these vulnerabilities could allow an attacker to bypass authentication.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

The following versions of Delta Electronics DIALink are affected:

  • DIALink: Versions V1.6.0.0 and prior

3.2 VULNERABILITY OVERVIEW

3.2.1 IMPROPER LIMITATION OF A PATHNAME TO A RESTRICTED DIRECTORY ('PATH TRAVERSAL') CWE-22

Delta Electronics DIALink has an Improper Limitation of a Pathname to a Restricted Directory vulnerability which could allow an attacker to bypass authentication.

CVE-2025-58320 has been assigned to this vulnerability. A CVSS v3.1 base score of 7.3 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L).

A CVSS v4 score has also been calculated for CVE-2025-58320. A base score of 6.9 has been calculated; the CVSS vector string is (AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N).

3.2.2 IMPROPER LIMITATION OF A PATHNAME TO A RESTRICTED DIRECTORY ('PATH TRAVERSAL') CWE-22

Delta Electronics DIALink has an Improper Limitation of a Pathname to a Restricted Directory vulnerability which could allow an attacker to bypass authentication.

CVE-2025-58321 has been assigned to this vulnerability. A CVSS v3.1 base score of 10 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H).

A CVSS v4 score has also been calculated for CVE-2025-58321. A base score of 10 has been calculated; the CVSS vector string is (AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H).

3.3 BACKGROUND

  • CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing
  • COUNTRIES/AREAS DEPLOYED: Worldwide
  • COMPANY HEADQUARTERS LOCATION: Taiwan

3.4 RESEARCHER

An anonymous researcher working with Trend Micro's Zero Day Initiative reported these vulnerabilities to CISA.

4. MITIGATIONS

Delta Electronics recommends users to download and upgrade to DIALink v1.8.0.0 or later. The latest version can be found at the Delta Download Center.

Delta Electronics has the following general recommendations for users to follow:

  • Don't click on untrusted Internet links or open unsolicited attachments in emails.
  • Avoid exposing control systems and equipment to the Internet.
  • Place systems and devices behind a firewall and isolate them from the business network.
  • When remote access is required, use a secure access method, such as a Virtual Private Network (VPN).

Users are encouraged to see Delta-PCSA-2025-00016_DIALink for more information.

For more information, contact Delta Electronics.

CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.

CISA also provides a section for control systems security recommended practices on the Industrial Control Systems (ICS) webpage on cisa.gov/ics. Several CISA products detailing cyber defense best practices are available for reading and download, including Improving ICS Cybersecurity with Defense-in-Depth Strategies.

CISA encourages organizations to implement recommended cybersecurity strategies for proactive defense of ICS assets.

Additional mitigation guidance and recommended practices are publicly available on the ICS webpage at cisa.gov/ics in the technical information paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies.

Organizations observing suspected malicious activity should follow established internal procedures and report findings to CISA for tracking and correlation against other incidents.

No known public exploitation specifically targeting these vulnerabilities has been reported to CISA at this time.

5. UPDATE HISTORY

  • September 16, 2025: Initial Publication

Blog post, originally published by CISA at cisa.gov.

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