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NTAP-20211018-0001 — CVE-2021-27001 Arbitrary Data Modification Vulnerability in Clustered Data ONTAP

Published 2021-10-18 · Updated 2021-10-19 · Status: Final · Exploitation: Not public · Severity: MEDIUM 5.5 · ONTAP affected: Yes

Official advisory: NTAP-20211018-0001 on security.netapp.com ↗. Affected versions, fixed releases, and workarounds live there — this page is a summary.

Product family: ONTAP | ONTAP-relevant | highest CVSS: 5.5

CVEs in this advisory

CVE-2021-27001 — MEDIUM · CVSS 5.5 · site index

What the CVE records say

CVE-2021-27001 — Clustered Data ONTAP versions 9.x prior to 9.5P18, 9.6P16, 9.7P16, 9.8P7 and 9.9.1P2 are susceptible to a vulnerability which could allow an authenticated privileged local attacker to arbitrarily modify Compliance-mode WORM data prior to the end of the retention period.

Impact

Successful exploitation of this vulnerability could lead to arbitrary modification of WORM data prior to the end of the retention period.

Affected products

Clustered Data ONTAP

Official fixes

Clustered Data ONTAP — vendor fix ↗
Clustered Data ONTAP — vendor fix ↗
Clustered Data ONTAP — vendor fix ↗
Clustered Data ONTAP — vendor fix ↗
Clustered Data ONTAP — 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.