Deserialization in Apache Nifi
CVE-2025-66524
Apache NiFi 1.20.0 through 2.6.0 include the GetAsanaObject Processor, which requires integration with a configurable Distribute Map Cache Client Service for storing and retrieving state information. The GetAsanaObject Processor used generic Java Object serialization and deserialization without filtering. Unfiltered Java object deserialization does not provide protection against crafted state information stored in the cache server configured for GetAsanaObject. Exploitation requires an Apache NiFi system running with the GetAsanaObject Processor, and direct access to the configured cache server. Upgrading to Apache NiFi 2.7.0 is the recommended mitigation, which replaces Java Object serialization with JSON serialization. Removing the GetAsanaObject Processor located in the nifi-asana-processors-nar bundle also prevents exploitation.
Vulnerability class: Insecure Deserialization
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.005 (42.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 42nd percentile — 42.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
- Apache Nifi — versions 2.7.0
- Apache Software Foundation Nifi — versions 1.20.0
Weakness classification (CWE)
References
- lists.apache.org/thread/k9h004ydjg7opdvxr0nfywtzf33z60d7 (vendor-advisory, Mailing List, Issue Tracking, Vendor Advisory)
- af854a3a-2127-422b-91ae-364da2661108 (Mailing List)
Frequently asked questions
- What is CVE-2025-66524?
- CVE-2025-66524 is a high-severity vulnerability in Apache Nifi, classified under Deserialization of Untrusted Data. CVSS score: 8.8/10. Published 2025-12-19.
- How severe is CVE-2025-66524?
- High severity. CVSS v3 base score is 8.8 out of 10.