Cisco Identity Services Engine Software up to 3.4.0 IP Access Restriction Feature authentication bypass by assumed-immutable data

Summaryinfo

A vulnerability labeled as problematic has been found in Cisco Identity Services Engine Software. Affected by this vulnerability is an unknown functionality of the component IP Access Restriction Feature. Executing a manipulation can lead to authentication bypass by assumed-immutable data. This vulnerability is registered as CVE-2025-20285. It is possible to launch the attack remotely. No exploit is available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Cisco Identity Services Engine Software. It has been declared as problematic. This vulnerability affects an unknown part of the component IP Access Restriction Feature. The manipulation with an unknown input leads to a authentication bypass by assumed-immutable data vulnerability. The CWE definition for the vulnerability is CWE-302. The authentication scheme or implementation uses key data elements that are assumed to be immutable, but can be controlled or modified by the attacker. As an impact it is known to affect integrity. CVE summarizes:

A vulnerability in the IP Access Restriction feature of Cisco ISE and Cisco ISE-PIC could allow an authenticated, remote attacker to bypass configured IP access restrictions and log in to the device from a disallowed IP address. This vulnerability is due to improper enforcement of access controls that are configured using the IP Access Restriction feature. An attacker could exploit this vulnerability by logging in to the API from an unauthorized source IP address. A successful exploit could allow the attacker to gain access to the targeted device from an IP address that should have been restricted. To exploit this vulnerability, the attacker must have valid administrative credentials.

The advisory is available at sec.cloudapps.cisco.com. This vulnerability was named CVE-2025-20285 since 10/10/2024. The exploitation appears to be easy. The attack can be initiated remotely. The exploitation requires an enhanced level of successful authentication. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 07/22/2025).

The vulnerability scanner Nessus provides a plugin with the ID 242173 (Cisco Identity Services Engine (cisco-sa-ise-multi-3VpsXOxO)), which helps to determine the existence of the flaw in a target environment.

Upgrading eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (242173) and EUVD (EUVD-2025-21709). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

• Policy Management Software

Vendor

• Cisco

Name

• Identity Services Engine Software

Version

• 3.1.0
• 3.1.0 p1
• 3.1.0 p2
• 3.1.0 p3
• 3.1.0 p4
• 3.1.0 p5
• 3.1.0 p6
• 3.1.0 p7
• 3.1.0 p8
• 3.1.0 p9
• 3.1.0 p10
• 3.2.0
• 3.2.0 p1
• 3.2.0 p2
• 3.2.0 p3
• 3.2.0 p4
• 3.2.0 p5
• 3.2.0 p6
• 3.2.0 p7
• 3.3.0
• 3.4.0

License

• commercial

Website

• Vendor: https://www.cisco.com/

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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