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CVE Record

CVE-2021-35641: 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. 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-2021-35641 is a MySQL Server denial-of-service issue. A highly privileged user with network access could cause the database server to hang or crash repeatedly. The main business risk is service disruption, not data theft or modification, based on the provided CVSS and description.

Executive priority

Treat as a scheduled remediation priority unless the affected database is business-critical, exposed to many privileged users, or already showing instability. The issue can cause complete service disruption but requires high privileges.

Technical view

Oracle identifies the affected component as MySQL Server Optimizer. Supported MySQL Server versions 8.0.26 and prior are affected. The CVSS vector is AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H, meaning network reachable, low complexity, high privileges required, and availability-only impact.

Likely exposure

Exposure is most likely where Oracle MySQL Server 8.0.26 or earlier is still deployed and accessible to privileged database users over network protocols.

Exploitation context

The provided bundle does not show CISA KEV listing or cited evidence of active exploitation. Exploitation requires high privileges, reducing broad internet-scale risk, but a compromised or malicious privileged account could disrupt database availability.

Researcher notes

Focus validation on version exposure, privilege boundaries, and availability telemetry. The public bundle does not provide root cause details, exploit specifics, CWE classification, or a named workaround beyond vendor advisory remediation.

Mitigation direction

  • Apply Oracle October 2021 CPU guidance or a later supported MySQL release.
  • Check NetApp guidance if MySQL is bundled or used in NetApp-supported environments.
  • Restrict network access to MySQL services to trusted administrative paths.
  • Limit and review highly privileged MySQL accounts.
  • Monitor database availability until remediation is complete.

Validation and detection

  • Inventory MySQL Server instances and identify versions 8.0.26 or earlier.
  • Confirm patch level against Oracle CPU October 2021 guidance.
  • Review privileged MySQL account membership and recent access patterns.
  • Check logs and monitoring for repeated hangs, crashes, or restart loops.
  • Verify any NetApp advisory applicability in managed environments.
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-2021-35641 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
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
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-2021-35641Attack 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 Server8.0.26 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.