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CVE Record

CVE-2020-14769: 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 5.6.49 and prior, 5.7.31 and prior and 8.0.21 and prior. Easily exploitable vulnerability allows low 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 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

This MySQL Server flaw can let an authenticated, low-privileged network user crash or hang the database. The business impact is service availability: applications depending on the affected MySQL instance may become unavailable until the database recovers or is restarted.

Executive priority

Treat this as a moderate-priority availability issue. It is not described as data theft or privilege escalation, but database downtime can still disrupt revenue systems, customer portals, and operational workflows.

Technical view

CVE-2020-14769 affects Oracle MySQL Server Optimizer in 5.6.49 and prior, 5.7.31 and prior, and 8.0.21 and prior. Oracle rates it CVSS 6.5: network exploitable, low complexity, low privileges required, no user interaction, availability impact only.

Likely exposure

Exposure is most likely where affected MySQL Server versions are reachable over the network and untrusted or broadly distributed database accounts exist. Downstream Linux and vendor advisories indicate packaged deployments should also be checked against their vendor update status.

Exploitation context

The source bundle does not cite active exploitation, and KEV is false. The described attack requires network access and valid low-privileged access to MySQL, with the result limited to denial of service through a hang or repeatable crash.

Researcher notes

No CWE, exploit proof, root cause detail, or exact fixed version is provided in the bundle. Focus analysis on authenticated network denial of service in Server: Optimizer and validate remediation against Oracle CPU October 2020 plus applicable downstream advisories.

Mitigation direction

  • Upgrade MySQL using Oracle CPU October 2020 guidance or downstream vendor packages.
  • Prioritize externally reachable, shared, or business-critical MySQL servers.
  • Restrict MySQL network access to trusted application hosts and administration paths.
  • Review and remove unnecessary low-privileged MySQL accounts.
  • Check NetApp, Fedora, and Gentoo advisories where those distributions or platforms are used.

Validation and detection

  • Inventory MySQL Server versions and flag 5.6.49, 5.7.31, 8.0.21, and earlier.
  • Confirm package updates from Oracle or the relevant operating system vendor are installed.
  • Review database exposure through firewall, security group, and listener configuration.
  • Check MySQL logs and service monitoring for unexplained crashes or hangs.
  • Verify application owners know which services depend on affected database instances.
Prepared
Confidence
high
Sources
8

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-2020-14769 mapping review

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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
7Source 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-2020-14769Attack 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 Server5.6.49 and prior, 5.7.31 and prior, 8.0.21 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.