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CVE Record

CVE-2021-2479: Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: DML).

Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: DML). Supported versions that are affected are 8.0.26 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-2021-2479 can let a highly privileged MySQL user crash or hang MySQL Server, causing a denial of service. It does not indicate data theft or data modification, but outage risk matters for systems that depend on MySQL availability.

Executive priority

Prioritize remediation for production MySQL systems where outages would disrupt business services. The flaw requires high privileges, so urgency is lower than unauthenticated remote bugs, but stale database infrastructure should still be updated.

Technical view

Oracle describes a Server:DML vulnerability in MySQL Server 8.0.26 and prior. CVSS 3.1 is 4.9: network reachable, low complexity, high privileges required, no user interaction, availability high, confidentiality and integrity none.

Likely exposure

Exposure is most likely where Oracle MySQL Server 8.0.26 or earlier is still deployed and reachable by highly privileged database users over network protocols.

Exploitation context

The bundle does not show CISA KEV listing or cited active exploitation. The vulnerability is described as easily exploitable once a high-privileged attacker has network access, with impact limited to repeatable crash or hang.

Researcher notes

Key constraints are PR:H and availability-only impact. The source bundle does not include CWE detail, proof-of-concept status, or exploit telemetry. Avoid expanding scope beyond MySQL Server 8.0.26 and prior without vendor confirmation.

Mitigation direction

  • Check Oracle October 2021 CPU guidance for the applicable MySQL update path.
  • Upgrade MySQL Server beyond affected 8.0.26 and prior builds where vendor-supported.
  • Apply relevant distribution packages if using Fedora-maintained MySQL builds.
  • Review NetApp advisory if MySQL is embedded in supported NetApp products.
  • Restrict high-privileged database access to trusted administrators and networks.

Validation and detection

  • Inventory MySQL Server versions and flag 8.0.26 or earlier.
  • Confirm whether hosts use Oracle, Fedora, NetApp, or other vendor packaging.
  • Verify privileged database accounts are limited and monitored.
  • Check change records for October 2021 CPU or later vendor updates.
  • Review database availability monitoring for unexplained crashes or hangs.
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

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CVE-2021-2479 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-2021-2479Attack 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 Server8.0.26 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.