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NTAP-20251224-0009 — CVE-2025-66471 Urllib3 Vulnerability in NetApp Products

Published 2025-12-24 · Updated 2026-09-23 · Status: Interim · Exploitation: Public · Severity: HIGH 7.5 · ONTAP affected: Yes

Official advisory: NTAP-20251224-0009 on security.netapp.com ↗. Affected versions, fixed releases, and workarounds live there — this page is a summary.

Product family: Active IQ Unified Manager · SolidFire / NetApp HCI · Other NetApp products · ONTAP · NetApp Console / BlueXP | ONTAP-relevant | highest CVSS: 7.5

CVEs in this advisory

CVE-2025-66471 — HIGH · CVSS 7.5 · site index

What the CVE records say

CVE-2025-66471 — urllib3 is a user-friendly HTTP client library for Python. Starting in version 1.0 and prior to 2.6.0, the Streaming API improperly handles highly compressed data. urllib3's streaming API is designed for the efficient handling of large HTTP responses by reading the content in chunks, rather than loading the entire response body into memory at once. When streaming a compressed response, urllib3 can perform decoding or decompression based on the HTTP Content-Encoding header (e.g., gzip, deflate, br, or zstd). The library must read compressed data from the network and decompress it until the requested chunk size is met. Any resulting decompressed data that exceeds the requested amount is held in an internal buffer for the next read operation. The decompression logic could cause urllib3 to fully decode a small amount of highly compressed data in a single operation. This can result in excessive resource consumption (high CPU usage and massive memory allocation for the decompressed data.

Impact

Successful exploitation of this vulnerability could lead to Denial of Service (DoS).

Affected products

Active IQ Unified Manager for VMware vSphere
Management Services for Element Software and NetApp HCI
NetApp Data Classification
ONTAP Select Deploy administration utility
Active IQ Config Advisor
Active IQ OneCollect
FAS/AFF BIOS - A900/9500
NetApp Console Agent OVA
NetApp NFS Plug-in for VMware VAAI
NetApp SolidFire & HCI Management Node
NetApp SolidFire & HCI Storage Node (Element Software)
NetApp XCP NFS

Official fixes

NetApp Data Classification — vendor fix ↗

References

https://nvd.nist.gov/vuln/detail/CVE-2025-66471 ↗

What to do

Check the affected products listed above against the official advisory's affected-versions table — that is where the exact ONTAP 9 release, ONTAP tool, or management product versions are named.
If affected and a fixed release exists, plan the upgrade — see the ONTAP upgrade runbook.
If exploitation is listed as "active", treat remediation as urgent and review exposure (management LIFs, ONTAP S3, SnapMirror endpoints).
Harden in parallel: security hardening baseline and ransomware protection on ONTAP.