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CVE Record

CVE-2021-2471: Vulnerability in the MySQL Connectors product of Oracle MySQL (component: Connector/J).

Vulnerability in the MySQL Connectors product of Oracle MySQL (component: Connector/J). Supported versions that are affected are 8.0.26 and prior. Difficult to exploit vulnerability allows high privileged attacker with network access via multiple protocols to compromise MySQL Connectors. Successful attacks of this vulnerability can result in unauthorized access to critical data or complete access to all MySQL Connectors accessible data and unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of MySQL Connectors. CVSS 3.1 Base Score 5.9 (Confidentiality and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:H).

MediumCVSS 5.9Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2021-2471 affects Oracle MySQL Connector/J in MySQL Connectors 8.0.26 and prior. It is difficult to exploit and requires a highly privileged network attacker, but a successful attack could expose critical connector-accessible data and cause repeated crashes or hangs.

Executive priority

Treat as a scheduled remediation item, not an emergency, unless sensitive data systems still run affected Connector/J versions. The business risk is data exposure and application availability loss if a privileged attacker can reach the environment.

Technical view

Oracle describes a Connector/J vulnerability with CVSS 3.1 score 5.9: AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:H. The stated impacts are confidentiality and availability, with no integrity impact. No CWE is provided in the source bundle.

Likely exposure

Exposure is most likely in Java applications using MySQL Connector/J 8.0.26 or earlier, especially where the connector accesses sensitive databases. Systems using newer, vendor-supported Connector/J versions may not be affected, but the bundle does not name a fixed version.

Exploitation context

The source bundle does not cite active exploitation, and CISA KEV status is false. Exploitation requires high privileges, network access, no user interaction, and high attack complexity, which reduces broad opportunistic risk.

Researcher notes

The public bundle is sparse: it names Oracle MySQL Connector/J, affected versions, privileges, attack complexity, and impact classes, but not root cause, CWE, exploit details, or a specific fixed version. Avoid extrapolating beyond Oracle guidance.

Mitigation direction

  • Inventory Java applications using MySQL Connector/J.
  • Identify any Connector/J versions 8.0.26 or prior.
  • Review Oracle Critical Patch Update guidance for this CVE.
  • Apply Oracle-supported Connector/J updates per vendor guidance.
  • Prioritize systems handling sensitive or regulated data.

Validation and detection

  • Check dependency manifests and runtime artifacts for Connector/J versions.
  • Confirm affected applications no longer use 8.0.26 or prior.
  • Verify deployment artifacts match approved dependency versions.
  • Review monitoring for connector hangs or repeated crashes.
Prepared
Confidence
medium
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-2021-2471 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
5.9 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/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
5.9CVSS 3.1MediumCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:H0.75.2Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

5.9Medium
CVSS 3.1 vector shape for CVE-2021-2471Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/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 Connectors8.0.26 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.