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CVE Record

CVE-2021-35612: 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 8.0.26 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 as well as unauthorized update, insert or delete access to some of MySQL Server accessible data. CVSS 3.1 Base Score 5.5 (Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:H).

MediumCVSS 5.5Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This MySQL Server flaw can let an already high-privileged network user disrupt the database and modify some accessible data. The main business risk is service interruption, with limited data integrity impact. Sources identify affected supported versions as MySQL Server 8.0.26 and prior.

Executive priority

Treat as a moderate-priority database reliability and integrity issue. Prioritize systems running MySQL Server 8.0.26 or earlier, especially production databases with broad privileged access or weak network segmentation.

Technical view

CVE-2021-35612 affects Oracle MySQL Server's Server: Optimizer component. The CVSS 3.1 vector is AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:H. Successful exploitation may cause hangs, repeatable crashes, and unauthorized update, insert, or delete access to some accessible data.

Likely exposure

Exposure is most relevant for MySQL Server 8.0.26 and prior where high-privileged accounts can connect over network protocols. The source data does not identify lower-privilege exploitation or specific exposed internet-facing scenarios.

Exploitation context

The CVE is not listed as KEV in the provided bundle, and no cited source states active exploitation. Exploitation requires high privileges but is described as easy once that access exists.

Researcher notes

The provided sources do not include root-cause detail, proof-of-concept status, or exact fixed build information. Analysis should stay anchored to Oracle CPU guidance, the CVSS vector, and affected-version statement.

Mitigation direction

  • Inventory MySQL Server instances and identify versions 8.0.26 and prior.
  • Review and apply Oracle's October 2021 Critical Patch Update guidance for MySQL Server.
  • Check NetApp advisory guidance if MySQL is present through affected NetApp products.
  • Restrict network access to MySQL to trusted administration and application paths.
  • Review high-privileged database accounts and remove unnecessary access.

Validation and detection

  • Confirm each MySQL Server version and patch level against Oracle CPU guidance.
  • Verify high-privileged accounts are limited to required users and services.
  • Review database logs for repeated crashes, hangs, or abnormal privileged data changes.
  • Validate network controls block unnecessary MySQL protocol access.
  • For NetApp environments, compare deployed products against the NetApp advisory.
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-2021-35612 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
5.5 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/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
5.5CVSS 3.1MediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:H1.24.2Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

5.5Medium
CVSS 3.1 vector shape for CVE-2021-35612Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/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 Server8.0.26 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.