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CVE Record

CVE-2021-2304: Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Stored Procedure).

Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Stored Procedure). Supported versions that are affected are 8.0.23 and prior. 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 as well as unauthorized update, insert or delete access to some of MySQL Server accessible data. CVSS 3.1 Base Score 5.5 (Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:H).

MediumCVSS 5.5Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This flaw affects Oracle MySQL Server 8.0.23 and earlier. A highly privileged attacker who can reach the database over the network could crash or hang the server and modify some accessible data. The main business risk is service disruption plus limited unauthorized data changes, not data theft.

Executive priority

Treat this as a scheduled remediation priority unless the affected database is internet-reachable or heavily shared by privileged users. Business urgency increases when MySQL supports critical services because successful exploitation can cause repeatable outages.

Technical view

CVE-2021-2304 is in MySQL Server’s Stored Procedure component. Oracle rates it CVSS 5.5 with network attack vector, low complexity, high privileges required, no user interaction, no confidentiality impact, low integrity impact, and high availability impact.

Likely exposure

Exposure is limited to Oracle MySQL Server 8.0.23 and prior. Risk is highest where high-privileged MySQL accounts can connect remotely, including administrative users, automation, or compromised service accounts.

Exploitation context

The provided sources do not show CISA KEV listing or active exploitation. The vulnerability is described as easily exploitable, but it requires high privileges and network access through supported MySQL protocols.

Researcher notes

The source bundle does not provide a CWE, root-cause detail, proof of concept, or named fixed version. Analysis should stay scoped to Oracle MySQL Server Stored Procedure behavior and the documented integrity and availability impacts.

Mitigation direction

  • Apply Oracle April 2021 CPU guidance for affected MySQL Server deployments.
  • Confirm no supported MySQL Server instance remains on 8.0.23 or earlier.
  • Restrict MySQL network access to trusted application and administration paths.
  • Reduce high-privileged MySQL accounts and remove unused administrative credentials.
  • Check NetApp guidance where MySQL exposure may exist through NetApp products.

Validation and detection

  • Inventory MySQL Server instances and record exact versions.
  • Verify production and backup environments are not running 8.0.23 or earlier.
  • Review privileged MySQL accounts with network login capability.
  • Check database availability logs for repeated crashes or hangs.
  • Review change logs for unexpected update, insert, or delete activity.
Prepared
Confidence
high
Sources
4

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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CVE-2021-2304 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
5.5 (3.1)
Known Exploited
No
Published

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

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
0Timeline events
0ADP providers
3Source links

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
5.5CVSS 3.1MediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:H1.24.2Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

5.5Medium
CVSS 3.1 vector shape for CVE-2021-2304Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
Oracle CorporationMySQL Server8.0.23 and priorListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.