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CVE Record

CVE-2021-2354: Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Federated).

Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Federated). Supported versions that are affected are 8.0.25 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-2021-2354 can let a highly privileged network attacker crash or hang MySQL Server. The business impact is availability: affected databases may become unavailable, disrupting applications that depend on them. The sources do not indicate data theft or unauthorized data modification from this vulnerability.

Executive priority

Treat as a medium-priority availability risk. Prioritize internet-exposed or business-critical MySQL systems first, especially where many administrators or service accounts have high privileges.

Technical view

Oracle describes a MySQL Server vulnerability in the Server: Federated component affecting supported versions 8.0.25 and prior. It is network-accessible, low complexity, requires high privileges, and needs no user interaction. CVSS 3.1 is 4.9 with high availability impact only.

Likely exposure

Exposure is most relevant for organizations running Oracle MySQL Server 8.0.25 or earlier where highly privileged database users can access the server over network protocols. Systems with tightly controlled privileged access have lower practical risk.

Exploitation context

The bundle marks KEV as false and provides no cited evidence of active exploitation. The vulnerability is described as easily exploitable, but only by a high-privileged attacker with network access.

Researcher notes

The public data is limited to Oracle, NetApp, Fedora, and CVE metadata. No CWE, proof-of-concept, or exploit-in-the-wild evidence is included. Avoid assuming confidentiality or integrity impact; the stated impact is complete denial of service.

Mitigation direction

  • Review Oracle July 2021 CPU guidance for the applicable MySQL Server fix path.
  • Update affected MySQL Server 8.0.25 or earlier deployments per vendor guidance.
  • Review NetApp and Fedora advisories if using their packaged or dependent products.
  • Restrict network access to MySQL administrative interfaces and privileged accounts.
  • Audit high-privilege database accounts for unnecessary access.

Validation and detection

  • Inventory MySQL Server versions and identify any 8.0.25 or earlier instances.
  • Confirm whether affected systems have received the relevant vendor security update.
  • Check whether MySQL is exposed to untrusted networks or broad internal access.
  • Review privileged database account assignments and recent access patterns.
  • Monitor database availability logs for unexplained hangs or repeated crashes.
Prepared
Confidence
high
Sources
6

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-2021-2354 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
5Source 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-2021-2354Attack 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 Server8.0.25 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.