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CVE Record

CVE-2021-2387: Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Optimizer).

Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Optimizer). Supported versions that are affected are 8.0.25 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-2021-2387 is a denial-of-service issue in Oracle MySQL Server. An attacker who already has high privileges and network access can cause the database server to hang or repeatedly crash, disrupting applications that depend on it.

Executive priority

Treat this as a moderate availability risk. It is unlikely to be the first path into an environment, but it can disrupt business services if a privileged account is compromised or misused.

Technical view

Oracle identifies the affected component as MySQL Server: Optimizer. Supported affected versions are MySQL Server 8.0.25 and prior. CVSS 3.1 is 4.9 with network attack vector, low complexity, high privileges required, no user interaction, and high availability impact only.

Likely exposure

Exposure is most likely on systems running Oracle MySQL Server 8.0.25 or earlier where highly privileged database access is reachable over the network. NetApp also published an advisory, so environments using NetApp products should review that vendor guidance.

Exploitation context

The source bundle does not show CISA KEV listing or confirmed active exploitation. Oracle describes the issue as easily exploitable, but only by a high-privileged attacker with network access via multiple protocols.

Researcher notes

No CWE, exploit details, or exact fixed version are provided in the bundle. Avoid assuming confidentiality or integrity impact; the cited CVSS vector indicates availability-only impact with high privileges required.

Mitigation direction

  • Review Oracle July 2021 CPU guidance for the supported update path.
  • Upgrade affected MySQL Server instances using vendor-supported fixes.
  • Restrict network access to MySQL services to trusted systems.
  • Review and minimize high-privilege MySQL accounts.
  • Check NetApp guidance if NetApp products embed or depend on MySQL.

Validation and detection

  • Inventory MySQL Server instances and record exact versions.
  • Flag MySQL Server 8.0.25 and earlier as affected.
  • Confirm Oracle CPU or later vendor fix is applied.
  • Review privileged database accounts with network access.
  • Monitor for unexplained MySQL hangs or repeatable crashes.
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-2021-2387 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-2021-2387Attack 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 Server8.0.25 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.