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CVE Record

CVE-2021-35597: Vulnerability in the MySQL Client product of Oracle MySQL (component: C API).

Vulnerability in the MySQL Client product of Oracle MySQL (component: C API). Supported versions that are affected are 8.0.26 and prior. Easily exploitable vulnerability allows low privileged attacker with network access via multiple protocols to compromise MySQL Client. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of MySQL Client. CVSS 3.1 Base Score 6.5 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H).

MediumCVSS 6.5Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2021-35597 is a denial-of-service flaw in Oracle MySQL Client’s C API. An attacker with low privileges and network access could make affected clients hang or crash repeatedly. The impact is operational disruption, not data theft or modification, based on the provided CVSS vector.

Executive priority

Treat this as a moderate availability risk. It is most urgent where MySQL client libraries support critical business workflows, batch jobs, monitoring, or application connectivity. There is no sourced evidence of data compromise or active exploitation in the provided bundle.

Technical view

The vulnerability affects Oracle MySQL Client C API in supported versions 8.0.26 and prior. It is network-reachable, low complexity, requires low privileges, and no user interaction. Successful exploitation can cause a hang or frequently repeatable crash of MySQL Client. CVSS 3.1 score is 6.5, with high availability impact only.

Likely exposure

Exposure is likely where Oracle MySQL Client or C API components version 8.0.26 or earlier are installed or bundled with applications. Systems using distribution packages or vendor appliances should be checked against Oracle, Fedora, and NetApp advisories.

Exploitation context

The provided sources do not establish active exploitation, and the CVE is not listed as KEV. The attack requires network access and low privileges via multiple protocols, but the public bundle does not include exploit details or proof-of-concept evidence.

Researcher notes

Key evidence is limited to CVE metadata and vendor advisories. No CWE, root-cause detail, exploit primitive, or exact fixed version is present in the bundle. Analysis should stay focused on version exposure, client-library dependency mapping, and vendor advisory confirmation.

Mitigation direction

  • Review Oracle’s October 2021 CPU guidance for the applicable MySQL client update path.
  • Apply relevant Fedora package updates where Fedora-distributed MySQL/MariaDB packages are in scope.
  • Check NetApp advisory coverage for affected products or bundled MySQL components.
  • Prioritize upgrades for client libraries used by critical applications or automation.
  • Monitor affected clients for repeated crashes or hangs until patched.

Validation and detection

  • Inventory MySQL Client and C API library versions across servers, containers, and build images.
  • Confirm whether installed versions are 8.0.26 or earlier.
  • Identify applications dynamically or statically linked against affected MySQL client libraries.
  • Verify vendor advisories for fixed package versions before closing remediation.
  • Review operational logs for unexplained MySQL client crashes or availability incidents.
Prepared
Confidence
medium
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-2021-35597 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
6.5 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:L/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
6.5CVSS 3.1MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H2.83.6Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

6.5Medium
CVSS 3.1 vector shape for CVE-2021-35597Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:L/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.