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NTAP-20211104-0005 — CVE-2021-3520 lz4 Vulnerability in NetApp Products

Published 2021-11-04 · Updated 2024-05-09 · Status: Final · Exploitation: Public · Severity: CRITICAL 9.8 · ONTAP affected: Yes

Official advisory: NTAP-20211104-0005 on security.netapp.com ↗. Affected versions, fixed releases, and workarounds live there — this page is a summary.

Product family: Active IQ Unified Manager · Cloud Backup / AltaVault / SteelStore · ONTAP | ONTAP-relevant | highest CVSS: 9.8

CVEs in this advisory

CVE-2021-3520 — CRITICAL · CVSS 9.8 · site index

What the CVE records say

CVE-2021-3520 — There's a flaw in lz4. An attacker who submits a crafted file to an application linked with lz4 may be able to trigger an integer overflow, leading to calling of memmove() on a negative size argument, causing an out-of-bounds write and/or a crash. The greatest impact of this flaw is to availability, with some potential impact to confidentiality and integrity as well.

Impact

Successful exploitation of this vulnerability could lead to disclosure of sensitive information, addition or modification of data, or Denial of Service (DoS).

Affected products

Active IQ Unified Manager for VMware vSphere
NetApp Cloud Backup (formerly AltaVault)
ONTAP Select Deploy administration utility

Official fixes

Active IQ Unified Manager for VMware vSphere — vendor fix ↗
ONTAP Select Deploy administration utility — vendor fix ↗

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.