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CVE Record

CVE-2021-35645: 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

This flaw can let an already high-privileged user crash or hang affected MySQL Server systems, causing database downtime. It does not claim data theft or data modification. Business urgency depends on whether MySQL 8.0.26 or earlier is exposed to privileged accounts over the network.

Executive priority

Prioritize remediation for internet-reachable or business-critical MySQL systems with broad privileged access. This is not described as a data breach vulnerability, but repeated database crashes can disrupt applications and operations.

Technical view

CVE-2021-35645 affects Oracle MySQL Server 8.0.26 and prior in the Server: Optimizer component. The CVSS 3.1 vector is AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H, meaning remote reachability but high privileges are required, with impact limited to availability.

Likely exposure

Organizations running Oracle MySQL Server 8.0.26 or earlier are potentially exposed, especially where privileged database users can connect over network protocols. NetApp also issued an advisory, indicating downstream product relevance should be checked through vendor guidance.

Exploitation context

The source bundle does not show active exploitation, and KEV status is false. Exploitation requires high privileges and network access, so the main realistic concern is outage caused by a malicious or compromised privileged database account.

Researcher notes

The record names only availability impact and does not provide CWE details. Avoid assuming confidentiality or integrity impact. The key triage points are affected MySQL version, privileged account exposure, network reachability, and whether vendor advisories apply to bundled deployments.

Mitigation direction

  • Inventory MySQL Server instances and identify versions 8.0.26 or earlier.
  • Review Oracle October 2021 CPU guidance and apply supported security updates.
  • Check NetApp guidance if MySQL is embedded in affected NetApp products.
  • Restrict privileged MySQL access to trusted administrators and application identities.
  • Monitor for unexplained MySQL hangs, crashes, or repeated restarts.

Validation and detection

  • Confirm each MySQL Server version and patch level against Oracle advisory guidance.
  • Verify privileged database accounts cannot connect from unnecessary networks.
  • Review MySQL logs and service uptime for repeated crash or hang patterns.
  • Confirm affected NetApp products are remediated per the NetApp advisory.
  • Document remaining exceptions and compensating access controls.
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-2021-35645 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-2021-35645Attack 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.