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CVE Record

CVE-2021-2305: Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: DML).

Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: DML). 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. 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).

MediumCVSS 4.9Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This flaw can let a highly privileged remote user crash or hang MySQL Server, causing a complete denial of service. It does not indicate data theft or data alteration. Business urgency depends on whether affected MySQL 8.0.23 or earlier servers are exposed to privileged users over the network.

Executive priority

Treat as a targeted availability risk for business-critical MySQL services. Prioritize systems where outages would disrupt operations and where high-privileged database access is broadly distributed or reachable over networks.

Technical view

CVE-2021-2305 affects Oracle MySQL Server 8.0.23 and prior in the Server: DML component. CVSS 3.1 is 4.9: AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H. The reported impact is repeatable crash or hang of MySQL Server availability.

Likely exposure

Exposure is most likely where MySQL Server 8.0.23 or earlier is reachable over network protocols by users with high database privileges. Internet exposure matters less than privileged account exposure, because the vulnerability requires high privileges.

Exploitation context

The source bundle does not show CISA KEV listing or cited active exploitation. The flaw is described as easily exploitable, but only by a high-privileged attacker with network access through multiple protocols.

Researcher notes

Public details are limited. No CWE is listed in the bundle. The vulnerability is in Server: DML, requires high privileges, and affects availability only. Avoid assuming unauthenticated exploitation, data compromise, or a specific fixed version beyond vendor guidance.

Mitigation direction

  • Inventory MySQL Server instances and identify versions 8.0.23 and prior.
  • Review Oracle April 2021 CPU guidance for the applicable remediation.
  • Apply vendor-supported updates or mitigations from Oracle and downstream vendors.
  • Restrict network access to MySQL from only trusted administrative paths.
  • Review and reduce high-privileged MySQL accounts where operationally possible.

Validation and detection

  • Confirm each MySQL Server version and map it against affected 8.0.23 and prior releases.
  • Verify whether any NetApp-managed products include affected MySQL components.
  • Review privileged account access paths to MySQL over network protocols.
  • Check database logs and monitoring for unexplained hangs, crashes, or restart loops.
  • Confirm remediation status against Oracle and vendor advisory documentation.
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-2021-2305 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
4.9 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/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
4.9CVSS 3.1MediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H1.23.6Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

4.9Medium
CVSS 3.1 vector shape for CVE-2021-2305Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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