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CVE Record

CVE-2021-2006: 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 8.0.19 and prior. Difficult to exploit 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 5.3 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H).

MediumCVSS 5.3Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2021-2006 is a denial-of-service flaw in Oracle MySQL Client C API versions 8.0.19 and earlier. A successful attack can make the client hang or crash repeatedly. The sources do not show data theft, data modification, or confirmed active exploitation.

Executive priority

Treat as a routine but real availability risk. It is not marked as actively exploited and does not indicate data compromise, but affected client libraries should be updated during normal patch cycles, faster for operationally critical systems.

Technical view

Oracle describes a difficult-to-exploit MySQL Client C API vulnerability reachable over the network by a low-privileged attacker using multiple protocols. Impact is availability only: complete denial of service of the MySQL Client. CVSS is 5.3, with high attack complexity and no user interaction required.

Likely exposure

Exposure is most likely where Oracle MySQL Client C API 8.0.19 or earlier, or downstream vendor packages covered by Fedora, Gentoo, or NetApp advisories, remain in use. Server-side MySQL presence alone is not enough; validate deployed client libraries and vendor-packaged dependencies.

Exploitation context

The provided bundle marks CISA KEV as false and includes no cited evidence of active exploitation. Oracle rates exploitation as difficult, requiring low privileges and network access. The practical business risk is service disruption in applications or tools depending on affected MySQL client components.

Researcher notes

No CWE is supplied in the bundle. The CVSS vector indicates network reachability, high complexity, low privileges, no user interaction, unchanged scope, and availability-only impact. Research should focus on accurate component identification and vendor package lineage, not server-only exposure assumptions.

Mitigation direction

  • Upgrade affected MySQL Client components beyond 8.0.19 using Oracle or vendor guidance.
  • Apply relevant Fedora, Gentoo, or NetApp security updates where those packages or products are used.
  • Prioritize systems where MySQL client crashes would disrupt production workflows.
  • Check vendor advisories for product-specific fixed versions and compensating controls.

Validation and detection

  • Inventory MySQL Client C API and packaged client library versions across servers, workstations, and appliances.
  • Confirm whether any deployed versions are 8.0.19 or earlier.
  • Map findings to Oracle, Fedora, Gentoo, and NetApp advisory applicability.
  • Review monitoring for repeated MySQL client hangs or crashes, without treating that as proof of exploitation.
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

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CVE-2021-2006 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
5.3 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:H/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
5.3CVSS 3.1MediumCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H1.63.6Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

5.3Medium
CVSS 3.1 vector shape for CVE-2021-2006Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:H/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 Server8.0.19 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.