CVE-2026-21665Network attack vector

Unauthenticated code execution via unsafe remoting deserialization

Published Feb 23, 2026 · Updated Feb 23, 2026

Unsafe deserialization in Fiserv Originate Loans Peripherals Print Service 2021.2.4 allows remote attackers to execute arbitrary code. The deprecated .NET Remoting TCP channels deserialize attacker-supplied object streams without a safe type boundary, allowing attacker-controlled object behavior. Exploitation requires a client-managed legacy deployment with remoting ports exposed to an untrusted network; default, supported, and Fiserv-hosted deployments are not affected.

CVSS severity7.7
High
EPSS probability0.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unsafe deserialization in Fiserv Originate Loans Peripherals Print Service 2021.2.4 allows remote attackers to execute arbitrary code. The deprecated .NET Remoting TCP channels deserialize attacker-supplied object streams without a safe type boundary, allowing attacker-controlled object behavior. Exploitation requires a client-managed legacy deployment with remoting ports exposed to an untrusted network; default, supported, and Fiserv-hosted deployments are not affected.

The record

CVE
CVE-2026-21665
Published
Feb 23, 2026
Updated
Feb 23, 2026
Vendor
Fiserv
Product
Originate Loans Peripherals Print Service
Classifications
CWE-502, CAPEC-586, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 23, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 23, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2021.2.4 <2021.2.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Fiserv · Originate Loans Peripherals Print Serviceversion=2021.2.4 <2021.2.4

Published CVSS scores

7.7HackerOneCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data
CAPEC-586Object Injection
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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