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CVE Record

CVE-2021-2001: 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 5.6.50 and prior, 5.7.30 and prior and 8.0.17 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-2021-2001 is a MySQL Server flaw that can let a high-privileged network attacker crash or hang the database. It is not described as data theft or data modification. Business impact is service disruption for applications relying on affected MySQL versions.

Executive priority

Treat as a planned availability-risk patch unless affected MySQL servers support critical services or have broad privileged access exposure. Prioritize faster for internet-adjacent databases, shared platforms, or environments with weak credential hygiene.

Technical view

Oracle describes this as a MySQL Server Optimizer vulnerability affecting 5.6.50 and prior, 5.7.30 and prior, and 8.0.17 and prior. The CVSS vector is AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H, meaning network-reachable, low complexity, high privilege required, and availability-only impact.

Likely exposure

Exposure is most likely where affected MySQL Server versions are reachable over a network by high-privileged users, service accounts, or compromised admin credentials. Downstream distribution or appliance packages should be checked separately against Fedora, Gentoo, NetApp, and Oracle guidance.

Exploitation context

The provided sources do not show CISA KEV listing or active exploitation evidence. Exploitation requires high privileges but is described as easy once that access exists, with outcome limited to denial of service through hang or repeatable crash.

Researcher notes

The source bundle provides CVSS and affected version ranges but no CWE, proof-of-concept, exploit details, or precise fixed version mapping. Keep analysis focused on availability impact and privilege-gated exposure.

Mitigation direction

  • Upgrade affected MySQL Server deployments according to Oracle CPU guidance.
  • Apply relevant Fedora, Gentoo, or NetApp vendor updates where applicable.
  • Restrict MySQL network access to trusted hosts and services.
  • Review and reduce high-privileged MySQL accounts.
  • Monitor MySQL crashes, hangs, and unexpected restarts.

Validation and detection

  • Inventory MySQL Server versions across production and staging.
  • Flag versions 5.6.50, 5.7.30, 8.0.17, and earlier.
  • Identify internet-facing or broadly reachable MySQL listeners.
  • Review high-privileged database users and service accounts.
  • Confirm vendor package status for downstream distributions or appliances.
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-2021-2001 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-2021-2001Attack 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 Server5.6.50 and prior, 5.7.30 and prior, 8.0.17 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.