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NTAP-20230818-0006 — CVE-2023-30861 Flask Vulnerability in NetApp Products

Published 2023-08-18 · Updated 2025-05-29 · Status: Final · Exploitation: Public · Severity: HIGH 7.5 · ONTAP affected: Yes

Official advisory: NTAP-20230818-0006 on security.netapp.com ↗. Affected versions, fixed releases, and workarounds live there — this page is a summary.

Product family: SolidFire / NetApp HCI · ONTAP | ONTAP-relevant | highest CVSS: 7.5

CVEs in this advisory

CVE-2023-30861 — HIGH · CVSS 7.5 · site index

What the CVE records say

CVE-2023-30861 — Flask is a lightweight WSGI web application framework. When all of the following conditions are met, a response containing data intended for one client may be cached and subsequently sent by the proxy to other clients. If the proxy also caches `Set-Cookie` headers, it may send one client's `session` cookie to other clients. The severity depends on the application's use of the session and the proxy's behavior regarding cookies. The risk depends on all these conditions being met. 1. The application must be hosted behind a caching proxy that does not strip cookies or ignore responses with cookies. 2. The application sets `session.permanent = True` 3. The application does not access or modify the session at any point during a request. 4. `SESSION_REFRESH_EACH_REQUEST` enabled (the default). 5. The application does not set a `Cache-Control` header to indicate that a page is private or should not be cached. This happens because vulnerable versions of Flask only set the `Vary: Cookie` header when the session is accessed or modified, not when it is refreshed (re-sent to update the expiration) without being accessed or modified. This issue has been fixed in versions 2.3.2 and 2.2.5.

Impact

Successful exploitation of this vulnerability could lead to disclosure of sensitive information.

Affected products

Management Services for Element Software and NetApp HCI
NetApp HCI Compute Node (Bootstrap OS)
ONTAP Select Deploy administration utility

Official fixes

Management Services for Element Software and NetApp HCI — vendor fix ↗
ONTAP Select Deploy administration utility — vendor fix ↗

References

https://github.com/pallets/flask/security/advisories/GHSA-m2qf-hxjv-5gpq ↗

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.