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CVE Record

CVE-2021-2478: 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 8.0.26 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

CVE-2021-2478 can let a highly privileged network user crash or hang Oracle MySQL Server, causing a complete denial of service. It does not indicate data theft or tampering. Business urgency depends on how critical the database is and how tightly privileged database access is controlled.

Executive priority

Treat as a service-availability risk, not a data breach signal. Prioritize systems supporting revenue, customer operations, or internal platforms where MySQL downtime would be material, especially if privileged database access is broad.

Technical view

The issue affects Oracle MySQL Server 8.0.26 and prior, component Server:DML. CVSS 3.1 is 4.9: network reachable, low complexity, high privileges required, no user interaction, availability impact high, confidentiality and integrity unaffected.

Likely exposure

Exposure is likely limited to environments running Oracle MySQL Server 8.0.26 or prior where privileged users or services can connect over supported network protocols. Embedded or vendor-packaged MySQL should be checked against the vendor advisories in the source bundle.

Exploitation context

The source bundle does not show CISA KEV listing or other cited evidence of active exploitation. Exploitation requires high privileges, reducing opportunistic risk, but successful abuse can repeatedly crash or hang the database service.

Researcher notes

Evidence supports affected versions, CVSS vector, privilege requirement, and denial-of-service impact. The bundle does not provide root cause detail, exploit procedure, or an exact fixed version, so validation should rely on Oracle and downstream vendor advisories.

Mitigation direction

  • Apply Oracle's relevant CPU or current vendor-supported MySQL update.
  • Check NetApp and Linux distribution advisories for packaged or embedded MySQL exposure.
  • Restrict MySQL network access to trusted hosts and applications.
  • Review and minimize high-privilege database accounts.
  • Monitor MySQL availability and crash patterns until remediation is complete.

Validation and detection

  • Inventory Oracle MySQL Server versions and flag 8.0.26 or prior.
  • Identify applications and users with high-privilege MySQL access.
  • Confirm whether vendor-packaged MySQL is covered by NetApp or Fedora advisories.
  • Review database logs and monitoring for repeated crashes or hangs.
  • Verify remediation against Oracle or downstream vendor release guidance.
Prepared
Confidence
high
Sources
7

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-2021-2478 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
6Source 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-2021-2478Attack 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 Server8.0.26 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.