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CVE Record

CVE-2021-35591: Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: DML).

Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: DML). 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-2021-35591 is a MySQL Server flaw that can let a highly privileged remote attacker crash or hang the database service. It is not described as exposing data or changing data, but outages can affect applications that depend on MySQL availability.

Executive priority

Treat as a planned remediation item for systems where MySQL availability matters. Escalate priority for internet-adjacent, shared, or business-critical databases, especially where many administrators or automation accounts hold high privileges.

Technical view

Oracle describes the issue in MySQL Server DML, affecting supported MySQL Server versions 8.0.26 and prior. The CVSS vector is network reachable, low complexity, no user interaction, high privileges required, unchanged scope, and high availability impact only.

Likely exposure

Exposure is most likely where MySQL Server 8.0.26 or earlier is reachable over the network by users or services holding high MySQL privileges. Fedora-packaged MySQL/MariaDB-related deployments and NetApp products should be checked against their advisories.

Exploitation context

The supplied sources do not show CISA KEV listing or active exploitation. The vulnerability is described as easily exploitable after the attacker already has high privileges and network access, limiting broad opportunistic risk but leaving insider, compromised-admin, and service-account scenarios relevant.

Researcher notes

The available record gives component, version range, CVSS, and availability impact, but not root-cause details or a named workaround. Avoid assuming exploit availability. Validation should focus on version/package state, privilege boundaries, and whether dependent vendor products inherit exposure.

Mitigation direction

  • Apply Oracle's October 2021 Critical Patch Update or later fixed MySQL Server release.
  • Apply the cited Fedora security updates where Fedora packages are used.
  • Check the NetApp advisory for product-specific impact and guidance.
  • Restrict MySQL network access to trusted hosts while remediation is pending.
  • Review high-privilege MySQL accounts and remove unnecessary access.

Validation and detection

  • Inventory MySQL Server instances and record exact versions.
  • Confirm affected instances are upgraded beyond 8.0.26 or vendor-fixed builds.
  • Check whether NetApp products in use reference this CVE.
  • Review database availability logs for unexplained hangs or repeated crashes.
  • Confirm privileged MySQL accounts are limited and monitored.
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.

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CVE-2021-35591 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
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
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-2021-35591Attack 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.