Advisory Details

October 1st, 2025

Delta Electronics DIALink Directory Traversal Authentication Bypass Vulnerability

ZDI-25-927
ZDI-CAN-26843

CVE ID CVE-2025-58320
CVSS SCORE 7.3, AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
AFFECTED VENDORS Delta Electronics
AFFECTED PRODUCTS DIALink
VULNERABILITY DETAILS

This vulnerability allows remote attackers to overwrite configuration files on affected installations of Delta Electronics DIALink. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the web service, which listens on TCP port 7631 by default. The issue results from the lack of proper validation of a user-supplied path prior to using it in file operations. An attacker can leverage this vulnerability to bypass authentication on the system.

ADDITIONAL DETAILS Delta Electronics has issued an update to correct this vulnerability. More details can be found at:
https://www.cisa.gov/news-events/ics-advisories/icsa-25-259-07
DISCLOSURE TIMELINE
  • 2025-05-22 - Vulnerability reported to vendor
  • 2025-10-01 - Coordinated public release of advisory
  • 2025-10-01 - Advisory Updated
CREDIT Anonymous
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