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CVE Record

CVE-2020-14777: 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 8.0.21 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 highly privileged attacker crash or hang MySQL Server, causing a complete denial of service. It does not indicate data theft or data tampering in the supplied sources, but it can interrupt applications that depend on MySQL availability.

Executive priority

Treat as a maintenance-priority availability risk. Escalate for databases supporting critical customer, billing, identity, or operational workflows, especially where privileged access is broadly distributed or MySQL is reachable across networks.

Technical view

CVE-2020-14777 affects Oracle MySQL Server Optimizer in supported versions 8.0.21 and prior. The CVSS 3.1 score is 4.9: network reachable, low attack complexity, high privileges required, no user interaction, and high availability impact only.

Likely exposure

Exposure is most relevant where MySQL Server 8.0.21 or earlier is reachable over the network by highly privileged database users or administrators. Systems using vendor-packaged MySQL from Fedora, Gentoo, NetApp-affected products, or Oracle distributions should be checked.

Exploitation context

The supplied bundle does not show CISA KEV listing or confirmed active exploitation. The vulnerability is described as easily exploitable, but only by a high-privileged attacker with network access via multiple protocols.

Researcher notes

Root-cause detail and CWE classification are not provided in the bundle. Analysis should stay focused on version exposure, privilege boundaries, network reachability, and availability monitoring rather than assuming confidentiality or integrity impact.

Mitigation direction

  • Apply Oracle October 2020 CPU or relevant vendor package updates.
  • Review NetApp, Fedora, and Gentoo advisories if those distributions or products are used.
  • Restrict MySQL network access to trusted application and administration hosts.
  • Limit high-privileged database accounts to users and services that require them.
  • Monitor MySQL availability and investigate repeated crashes or hangs.

Validation and detection

  • Inventory MySQL Server versions and flag 8.0.21 or prior.
  • Map internet, VPN, and internal network paths to MySQL services.
  • Identify accounts with high privileges on affected MySQL instances.
  • Verify installed packages align with Oracle or distribution advisory guidance.
  • Review service logs for unexplained optimizer-related crashes or repeated restarts.
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-2020-14777 mapping review

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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
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
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-2020-14777Attack 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 Server8.0.21 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.