---
id: CVE-2025-53042
title: >-
  Vulnerability in the MySQL Server product of Oracle MySQL (component: Server:
  Optimizer)
summary: >-
  Vulnerability in the MySQL Server product of Oracle MySQL (component: Server:
  Optimizer).  Supported versions that are affected are 8.0.0-8.0.43,
  8.4.0-8.4.6 and  9.0.0-9.4.0. Easily exploitable vulnerability allows high
  privileged attac…
severity: medium
cvss: 4.9
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-400
vendor: oracle
product: mysql_server
affected:
  - 'mysql_server >= 8.0.0, <= 8.0.43'
  - 'mysql_server >= 8.4.0, <= 8.4.6'
  - 'mysql_server >= 9.0.0, <= 9.4.0'
published: '2025-10-21'
updated: '2026-09-30'
sourceUpdated: '2026-09-30T23:10:00.237'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-53042'
references:
  - url: 'https://www.oracle.com/security-alerts/cpuoct2025.html'
    label: secalert_us@oracle.com
tags:
  - nvd
epss: 0.0058
epssPercentile: 0.45596
ingestedAt: '2026-09-30T23:29:32.438Z'
---

## Overview

Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Optimizer).  Supported versions that are affected are 8.0.0-8.0.43, 8.4.0-8.4.6 and  9.0.0-9.4.0. Easily exploitable vulnerability allows high privileged attacker with network access via multiple protocols to compromise MySQL Server.  Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of MySQL Server. CVSS 3.1 Base Score 4.9 (Availability impacts).  CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H).

## Affected

- `mysql_server >= 8.0.0, <= 8.0.43`
- `mysql_server >= 8.4.0, <= 8.4.6`
- `mysql_server >= 9.0.0, <= 9.4.0`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.