CVE-2022-21556Network attack vector

Data modification and repeated server crashes

Published Jul 19, 2022 · Updated Sep 24, 2024

Optimizer vulnerability in Oracle MySQL Server 8.0.28 and earlier allows remote authenticated users to modify data or crash the server. Oracle identifies the Server: Optimizer component but has not published the faulty operation or input that triggers the condition. A high-privilege MySQL account and network access via a supported protocol are required; successful exploitation can alter all accessible data and cause a hang or repeatable crash.

CVSS severity6.5
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

Optimizer vulnerability in Oracle MySQL Server 8.0.28 and earlier allows remote authenticated users to modify data or crash the server. Oracle identifies the Server: Optimizer component but has not published the faulty operation or input that triggers the condition. A high-privilege MySQL account and network access via a supported protocol are required; successful exploitation can alter all accessible data and cause a hang or repeatable crash.

The record

CVE
CVE-2022-21556
Published
Jul 19, 2022
Updated
Sep 24, 2024
Vendor
Oracle Corporation
Product
MySQL Server
Classifications
T1499.004
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Jul 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

6.5OracleCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/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

T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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