---
title: "CVE-2026-91664: Oracle Essbase - Denial of Service"
description: "Oracle Essbase 21.8.3.0.0 contains a denial of service caused by unauthenticated network access via TCP, letting attackers cause a hang or repeated crash, exploit requires network access."
url: https://panop.io/threat-heartbeat/CVE-2026-91664/
---

# CVE-2026-91664 Oracle Essbase - Denial of Service

Oracle Essbase 21.8.3.0.0 contains a denial of service caused by unauthenticated network access via TCP, letting attackers cause a hang or repeated crash, exploit requires network access.

CVSS base score 7.5 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-91664)

## Details

Type

Denial of Service

Impact

Denial Of Service

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Published

20 October 2026

Updated

21 October 2026

## Vendor fix

Update to the latest available version beyond 21.8.3.0.0.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-91664](https://nvd.nist.gov/vuln/detail/CVE-2026-91664)
- [https://www.oracle.com/security-alerts/cpuoct2026.html](https://www.oracle.com/security-alerts/cpuoct2026.html)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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