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CVE Record

CVE-2021-2383: 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-2021-2383 is a MySQL Server availability flaw in the optimizer. An attacker already holding high database privileges and network access could make MySQL hang or repeatedly crash. The main business risk is service outage, not data theft or tampering, based on the supplied CVSS details.

Executive priority

Prioritize remediation on production or customer-facing MySQL systems where outages would affect revenue, operations, or SLAs. This is not a top-tier emergency from the supplied evidence, but it should be patched through normal vulnerability management because complete service denial is possible.

Technical view

Oracle lists affected MySQL Server versions as 8.0.25 and prior, component Server: Optimizer. CVSS 3.1 is 4.9: network reachable, low attack complexity, high privileges required, no user interaction, unchanged scope, no confidentiality or integrity impact, high availability impact.

Likely exposure

Exposure is most likely where MySQL Server 8.0.25 or earlier remains deployed and reachable by users or services with high database privileges. Internet exposure increases operational concern, but the privilege requirement limits broad unauthenticated risk.

Exploitation context

The bundle does not show CISA KEV listing or cited evidence of active exploitation. The described attacker must already have high privileges and network access over supported MySQL protocols. Treat this mainly as an outage-risk vulnerability.

Researcher notes

Evidence is limited to advisory-level detail. The root issue is in MySQL Server optimizer behavior, but the bundle provides no CWE, proof-of-concept, fixed version number, or exploit telemetry. Avoid assumptions beyond high-privileged network-triggered denial of service.

Mitigation direction

  • Apply Oracle MySQL security updates from the July 2021 CPU or later vendor guidance.
  • Upgrade affected MySQL Server 8.0.25 and prior deployments to a supported fixed release.
  • Apply relevant downstream vendor updates, including Fedora or NetApp guidance where applicable.
  • Restrict MySQL network access to trusted application and administration paths.
  • Review and reduce high-privileged MySQL accounts to operational necessity only.

Validation and detection

  • Inventory MySQL Server versions and flag 8.0.25 or earlier.
  • Confirm whether MySQL is reachable over network paths by privileged users or services.
  • Review privileged MySQL accounts, service accounts, and administrative access patterns.
  • Verify installed packages or builds against Oracle and downstream vendor advisories.
  • Check monitoring for unexplained MySQL hangs, crashes, or repeated restarts.
Prepared
Confidence
high
Sources
6

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-2021-2383 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
5Source 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-2021-2383Attack 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.