CVE-2021-2304Network attack vector

Authenticated database modification and service interruption

Published Apr 22, 2021 · Updated Sep 26, 2024

A stored-procedure flaw in Oracle MySQL Server 8.0.23 and earlier allows remote authenticated users to crash the server or alter data. Oracle identifies the affected locus only as Server: Stored Procedure and has not published the malformed operation or input that triggers the failure or unauthorized writes. Exploitation requires high database privileges and network access over MySQL protocols; consequences are limited to hangs or repeatable crashes and updates, inserts, or deletions of accessible data.

CVSS severity5.5
Medium
EPSS probability1.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A stored-procedure flaw in Oracle MySQL Server 8.0.23 and earlier allows remote authenticated users to crash the server or alter data. Oracle identifies the affected locus only as Server: Stored Procedure and has not published the malformed operation or input that triggers the failure or unauthorized writes. Exploitation requires high database privileges and network access over MySQL protocols; consequences are limited to hangs or repeatable crashes and updates, inserts, or deletions of accessible data.

The record

CVE
CVE-2021-2304
Published
Apr 22, 2021
Updated
Sep 26, 2024
Vendor
Oracle Corporation
Product
MySQL Server
Classifications
T1565.001, T1499
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Apr 22, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 26, 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=8.0.23 and prior

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Oracle Corporation · MySQL Serverversion=8.0.23 and prior

Published CVSS scores

5.5Oracle CorporationCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:H
5.5NIST NVDAV:N/AC:L/Au:S/C:N/I:P/A:P

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1565.001Stored Data Manipulation
T1499Endpoint Denial of Service

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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