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NTAP-20240503-0008 — CVE-2023-6516 ISC BIND Vulnerability in NetApp Products

Published 2024-05-03 · Updated 2025-05-29 · Status: Final · Exploitation: Public · Severity: HIGH 7.5 · ONTAP affected: Yes

Official advisory: NTAP-20240503-0008 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 · ONTAP | ONTAP-relevant | highest CVSS: 7.5

CVEs in this advisory

CVE-2023-6516 — HIGH · CVSS 7.5 · site index

What the CVE records say

CVE-2023-6516 — To keep its cache database efficient, `named` running as a recursive resolver occasionally attempts to clean up the database. It uses several methods, including some that are asynchronous: a small chunk of memory pointing to the cache element that can be cleaned up is first allocated and then queued for later processing. It was discovered that if the resolver is continuously processing query patterns triggering this type of cache-database maintenance, `named` may not be able to handle the cleanup events in a timely manner. This in turn enables the list of queued cleanup events to grow infinitely large over time, allowing the configured `max-cache-size` limit to be significantly exceeded. This issue affects BIND 9 versions 9.16.0 through 9.16.45 and 9.16.8-S1 through 9.16.45-S1.

Impact

Successful exploitation of this vulnerability could lead to Denial of Service (DoS). <br><br> Active IQ Unified Manager for VMware vSphere:<br> Affected only in versions 9.12 and 9.13.

Affected products

Active IQ Unified Manager for VMware vSphere
NetApp HCI Baseboard Management Controller (BMC) - H300S/H500S/H700S/H410S
NetApp HCI Baseboard Management Controller (BMC) - H410C
NetApp HCI Compute Node (Bootstrap OS)
ONTAP tools for VMware vSphere 10

Official fixes

Active IQ Unified Manager for VMware vSphere — vendor fix ↗
ONTAP tools for VMware vSphere 10 — vendor fix ↗

References

https://kb.isc.org/docs/cve-2023-6516 ↗

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.