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ICSA-25-259-07: Delta Electronics DIALink ↗ source

September 16, 2025 CISA ICS Advisory

Summary

Successful exploitation of these vulnerabilities could allow an attacker to bypass authentication. CVE-2025-58320: 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: Delta Electronics DIALink has an Improper Limitation of a Pathname to a Restricted Directory vulnerability which could allow an attacker to bypass authentication.

Advisory Details CISA ICS CSAF feed

Advisory ID
ICSA-25-259-07
Status
Final · version 1
Initial release
2025-09-16
Last revised
2025-09-16
Vendor
Delta Electronics
Critical infrastructure sectors
Critical Manufacturing
Deployed
Worldwide
Vendor headquarters
Taiwan

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

Credit: an anonymous researcher (Trend Micro's Zero Day Initiative)

Affected products (1)
  • DIALink — <=V1.6.0.0

From CISA's machine-readable CSAF 2.0 advisory (JSON).

Vulnerabilities as Stated by the Advisory

CVEWeaknessCVSS v3Details
CVE-2025-58321 CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') 10.0 Critical Delta Electronics DIALink has an Improper Limitation of a Pathname to a Restricted Directory vulnerability which could allow an attacker to bypass authentication.

Vendor fix: 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. ↗

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

Mitigation: Don't click on untrusted Internet links or open unsolicited attachments in emails.

Affected, fixed & timeline

Affected:

  • DIALink <=V1.6.0.0

Mitigation: Avoid exposing control systems and equipment to the Internet.

Mitigation: Place systems and devices behind a firewall and isolate them from the business network.

Mitigation: When remote access is required, use a secure access method, such as a virtual private network (VPN).

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

Mitigation: For more information, contact Delta Electronics.

CVE-2025-58320 CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') 7.3 High Delta Electronics DIALink has an Improper Limitation of a Pathname to a Restricted Directory vulnerability which could allow an attacker to bypass authentication.

Vendor fix: 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. ↗

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

Mitigation: Don't click on untrusted Internet links or open unsolicited attachments in emails.

Affected, fixed & timeline

Affected:

  • DIALink <=V1.6.0.0

Mitigation: Avoid exposing control systems and equipment to the Internet.

Mitigation: Place systems and devices behind a firewall and isolate them from the business network.

Mitigation: When remote access is required, use a secure access method, such as a virtual private network (VPN).

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

Mitigation: For more information, contact Delta Electronics.

Scores and weakness types are as CISA or the republishing vendor stated them in this advisory; the linked CVE pages carry the independently enriched CVSS and SSVC assessments.

News Coverage

No coverage found in monitored research blogs or news feeds.

CVEs Referenced in This Publication

CVECVSSAffected
CVE-2025-58321 10.0 Critical Delta Electronics DIALink Delta Electronics DIALink has an Directory Traversal Authentication Bypass Vulnerability.
CVE-2025-58320 7.3 High Delta Electronics DIALink Delta Electronics DIALink has an Directory Traversal Authentication Bypass Vulnerability.

Named by the advisory itself. Each CVE links to its tracked detail page.

Vendors Named in This Publication

Each vendor links to its Known Exploited Vulnerabilities catalog page. Only vendors that appear in the KEV catalog are listed, either because the publication cites one of their KEV entries or because it names them directly.