LiveActive security incident?Get immediate response
CVE Record

CVE-2021-2389: Vulnerability in the MySQL Server product of Oracle MySQL (component: InnoDB).

Vulnerability in the MySQL Server product of Oracle MySQL (component: InnoDB). Supported versions that are affected are 5.7.34 and prior and 8.0.25 and prior. Difficult to exploit vulnerability allows unauthenticated 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 5.9 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H).

MediumCVSS 5.9Not KEV-listedUpdated
Discuss exposureBack to CVEs
Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2021-2389 is a MySQL Server InnoDB vulnerability that can let an unauthenticated network attacker cause MySQL to hang or crash repeatedly. The documented impact is availability loss, not data theft or data modification. Exploitation is rated difficult, but affected database servers can still create business outage risk.

Executive priority

Treat as a service-continuity risk. Remediate through normal vulnerability management, with accelerated handling for externally reachable or mission-critical databases. Current evidence does not support data compromise or active exploitation claims.

Technical view

Oracle describes a remotely reachable vulnerability in MySQL Server InnoDB affecting 5.7.34 and prior and 8.0.25 and prior. CVSS 3.1 is 5.9 with high attack complexity, no privileges, no user interaction, unchanged scope, and high availability impact only.

Likely exposure

Exposure is most likely where MySQL Server versions 5.7.34 or earlier, or 8.0.25 or earlier, are reachable over a network. Internet-facing databases, shared internal database services, and downstream packaged deployments referenced by Fedora or NetApp advisories should be reviewed.

Exploitation context

The provided sources do not show CISA KEV listing or active exploitation. Oracle states exploitation is difficult and requires unauthenticated network access via multiple protocols. Successful exploitation can cause complete denial of service through hangs or frequent repeatable crashes.

Researcher notes

No CWE is provided in the bundle. Root-cause detail and fixed-version specifics are not included here. Analysis should remain limited to availability impact, InnoDB component scope, affected version ranges, high attack complexity, and absence of cited active exploitation evidence.

Mitigation direction

  • Apply Oracle July 2021 CPU guidance or a current supported MySQL release.
  • Use Fedora or NetApp advisory updates where those distributions or products apply.
  • Restrict MySQL network access to trusted application hosts and administration networks.
  • Prioritize externally reachable and business-critical MySQL servers.
  • Monitor MySQL availability and crash patterns until remediation is complete.

Validation and detection

  • Inventory MySQL Server versions across production, staging, and appliances.
  • Flag MySQL 5.7.34 and earlier or 8.0.25 and earlier.
  • Confirm remediation against Oracle, Fedora, or NetApp guidance as applicable.
  • Review database logs for repeated crashes, hangs, or unexplained restarts.
  • Verify network controls limit MySQL access to authorized sources.
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

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cve · low confidence lookup

CVE-2021-2389 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

Open ATT&CK lookup
Vulnerability profileCVE Program record
Severity
Medium
CVSS
5.9 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:H/PR:N/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
5.9CVSS 3.1MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H2.23.6Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

5.9Medium
CVSS 3.1 vector shape for CVE-2021-2389Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:H/PR:N/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 Server5.7.34 and prior, 8.0.25 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.