CVE-2022-21438Network attack vector

High-privilege denial of service via optimizer flaw

Published Apr 19, 2022 · Updated Sep 24, 2024

MySQL Server 8.0.28 and earlier contains a denial-of-service vulnerability that allows remote authenticated users to interrupt service via multiple network protocols. The Server Optimizer mishandles crafted optimizer requests, causing the process to hang or repeatedly crash. Exploitation requires high privileges and no user interaction; impact is limited to availability, with no reported confidentiality or integrity loss.

CVSS severity4.9
Medium
EPSS probability1.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

MySQL Server 8.0.28 and earlier contains a denial-of-service vulnerability that allows remote authenticated users to interrupt service via multiple network protocols. The Server Optimizer mishandles crafted optimizer requests, causing the process to hang or repeatedly crash. Exploitation requires high privileges and no user interaction; impact is limited to availability, with no reported confidentiality or integrity loss.

The record

CVE
CVE-2022-21438
Published
Apr 19, 2022
Updated
Sep 24, 2024
Vendor
Oracle Corporation
Product
MySQL Server
Classifications
T1499
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Apr 19, 2022CVE publishedPublication date reported by the CVE source.
  2. Sep 24, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=8.0.28 and prior

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Oracle Corporation · MySQL Serverversion=8.0.28 and prior

Published CVSS scores

4.9Oracle CorporationCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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