Cisco Identity Services Engine IpAccessFilter Direct Request Authentication Bypass Vulnerability

July 17th, 2025
ZDI-25-605 ZDI-CAN-26480

CVE ID

CVE-2025-20285

CVSS Score

7.2 AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Affected Vendors

Cisco

Affected Products

Identity Services Engine

Vulnerability Details

This vulnerability allows remote attackers to bypass IP restrictions on affected installations of Cisco Identity Services Engine. Authentication is required to exploit this vulnerability.

The specific flaw exists within the configuration of the web.xml file. The issue results from an incomplete Spring Boot filter mapping. An attacker can leverage this vulnerability to bypass IP restrictions on the system.

Additional Details

Cisco has issued an update to correct this vulnerability. More details can be found at:
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ise-multi-3VpsXOxO

Disclosure Timeline

  • 2025-05-06 - Vulnerability reported to vendor
  • 2025-07-17 - Coordinated public release of advisory
  • 2025-07-17 - Advisory Updated

Credit

Kentaro Kawane of GMO Cybersecurity by Ierae

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