CVE-2025-66524Network attack vector

Code execution via unfiltered cached-object deserialization

Published Dec 19, 2025 · Updated Dec 19, 2025

Unsafe deserialization in Apache NiFi 1.20.0 through 2.6.0 allows attackers to execute code through crafted cache state. GenericObjectSerDe.deserialize passes cache-supplied bytes to ObjectInputStream.readObject without a class filter. Exploitation requires a running GetAsanaObject Processor and direct access to its configured cache server; code executes in the NiFi process.

CVSS severity7.5
High
EPSS probability0.51%
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 Apache NiFi 1.20.0 through 2.6.0 allows attackers to execute code through crafted cache state. GenericObjectSerDe.deserialize passes cache-supplied bytes to ObjectInputStream.readObject without a class filter. Exploitation requires a running GetAsanaObject Processor and direct access to its configured cache server; code executes in the NiFi process.

The record

CVE
CVE-2025-66524
Published
Dec 19, 2025
Updated
Dec 19, 2025
Vendor
The Apache Software Foundation
Product
Apache NiFi
Classifications
CWE-502, T1190
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Dec 19, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 19, 2025Record 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=1.20.0 <=2.6.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

The Apache Software Foundation · Apache NiFiversion=1.20.0 <=2.6.0

Published CVSS scores

8.8National Institute of Standards and TechnologyCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.5Apache Software FoundationCVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:N/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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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