Fiserv Originate Loans Peripherals up to 2021.2.4 Print Service deserialization

Summaryinfo

A vulnerability has been found in Fiserv Originate Loans Peripherals up to 2021.2.4 and classified as very critical. The affected element is an unknown function of the component Print Service. The manipulation leads to deserialization. This vulnerability is documented as CVE-2026-21665. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in Fiserv Originate Loans Peripherals up to 2021.2.4 and classified as very critical. This issue affects an unknown part of the component Print Service. The manipulation with an unknown input leads to a deserialization vulnerability. Using CWE to declare the problem leads to CWE-502. The product deserializes untrusted data without sufficiently verifying that the resulting data will be valid. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

The Print Service component of Fiserv Originate Loans Peripherals (formerly Velocity Services) in unsupported version 2021.2.4 (build 4.7.3155.0011) uses deprecated .NET Remoting TCP channels that allow unsafe deserialization of untrusted data. When these services are exposed to an untrusted network in a client-managed deployment, an unauthenticated attacker can achieve remote code execution. Version 2021.2.4 is no longer supported by Fiserv. Customers should upgrade to a currently supported release (2025.1 or later) and ensure that .NET Remoting service ports are not exposed beyond trusted network boundaries. This CVE documents behavior observed in a client-hosted deployment running an unsupported legacy version of Originate Loans Peripherals with .NET Remoting ports exposed to an untrusted network. This is not a default or supported configuration. Customers running legacy versions should upgrade to a currently supported release and ensure .NET Remoting ports are restricted to trusted network segments. The finding does not apply to Fiserv-hosted environments.

The weakness was released by Victor A. Morales. The identification of this vulnerability is CVE-2026-21665 since 01/02/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 02/24/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• Fiserv

Name

• Originate Loans Peripherals

Version

• 2021.2.0
• 2021.2.1
• 2021.2.2
• 2021.2.3
• 2021.2.4

CPE 2.3info

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CPE 2.2info

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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