Advisory Details

June 17th, 2025

Delta Electronics COMMGR Insufficient Randomization Authentication Bypass Vulnerability

ZDI-25-397
ZDI-CAN-25049

CVE ID CVE-2025-3495
CVSS SCORE 9.8, AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
AFFECTED VENDORS Delta Electronics
AFFECTED PRODUCTS COMMGR
VULNERABILITY DETAILS

This vulnerability allows remote attackers to bypass authentication on affected installations of Delta Electronics COMMGR. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the PLC simulator service, which listens on TCP port 8895 by default. By conducting a brute force attack at moderate expense, an attacker can find a valid session identifier. 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-25-105-07
DISCLOSURE TIMELINE
  • 2024-11-19 - Vulnerability reported to vendor
  • 2025-06-17 - Coordinated public release of advisory
  • 2025-06-17 - Advisory Updated
CREDIT Anonymous
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