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CVE Record

CVE-2021-2193: 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 8.0.23 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

CVE-2021-2193 is a MySQL Server availability flaw in the Optimizer component. An attacker who already has high privileges and network access to MySQL can make the server hang or repeatedly crash. The business risk is database downtime, not data theft or tampering based on the provided sources.

Executive priority

Handle through prioritized patch management, faster for production databases or externally reachable management networks. This is not presented as an emergency remote takeover issue, but downtime risk can be material for business-critical MySQL services.

Technical view

Oracle reports affected MySQL Server versions are 8.0.23 and prior. The CVSS vector is AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H, meaning network-reachable exploitation is easy but requires high privileges. Successful exploitation causes complete denial of service through hangs or repeatable crashes.

Likely exposure

Exposure is most relevant where MySQL Server 8.0.23 or earlier remains deployed, especially if reachable over network protocols by administrators, database operators, or highly privileged application accounts.

Exploitation context

The source bundle does not show CISA KEV listing or cited evidence of active exploitation. The required high privilege level limits opportunistic abuse, but a compromised privileged account could turn this into a database outage.

Researcher notes

The public details identify Oracle MySQL Server Optimizer as the affected component but do not provide CWE, root-cause detail, exploit procedure, or named fixed version in the bundle. Avoid assuming confidentiality or integrity impact; sources describe availability impact only.

Mitigation direction

  • Apply Oracle April 2021 CPU guidance or later vendor-supported MySQL updates.
  • Update Fedora or other distribution packages using the relevant vendor advisories.
  • Restrict MySQL network access to trusted hosts and administrative paths.
  • Review and reduce high-privilege MySQL accounts where operationally possible.
  • Check NetApp guidance if MySQL is embedded in affected NetApp environments.

Validation and detection

  • Inventory MySQL Server versions and flag 8.0.23 and prior.
  • Confirm the installed package includes the relevant vendor security update.
  • Identify MySQL instances reachable over network protocols.
  • Review accounts with high MySQL privileges and their usage paths.
  • Check monitoring for unexplained MySQL hangs or repeatable crashes.
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-2021-2193 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-2021-2193Attack 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.