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CVE Record

CVE-2021-2429: Vulnerability in the MySQL Server product of Oracle MySQL (component: InnoDB).

Vulnerability in the MySQL Server product of Oracle MySQL (component: InnoDB). Supported versions that are affected are 8.0.25 and prior. Difficult to exploit vulnerability allows unauthenticated 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 5.9 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H).

MediumCVSS 5.9Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2021-2429 is a MySQL Server availability vulnerability in InnoDB. An unauthenticated network attacker may be able to make affected MySQL servers hang or crash repeatedly. It does not indicate data theft or data modification, but it can disrupt database-dependent applications.

Executive priority

Treat as a moderate availability risk. Prioritize remediation for internet-reachable or business-critical databases because successful exploitation could interrupt applications, but current sources do not support data compromise or active exploitation claims.

Technical view

Oracle lists MySQL Server 8.0.25 and prior as affected. The issue is in the InnoDB component, exploitable over the network via multiple protocols with high attack complexity, no credentials, and no user interaction. CVSS 3.1 is 5.9, with impact limited to availability.

Likely exposure

Exposure is most likely where Oracle MySQL Server 8.0.25 or earlier is reachable over a network, especially from untrusted segments. Systems using vendor appliances or platforms that embed MySQL should be checked against their supplier advisories.

Exploitation context

The bundle does not show CISA KEV listing or cited evidence of active exploitation. ZDI published an advisory, indicating coordinated disclosure, but the available evidence only supports potential denial of service, not confirmed exploitation in the wild.

Researcher notes

Key constraints are AV:N/AC:H/PR:N/UI:N with A:H only. The source bundle does not include a CWE, root-cause detail, exploit procedure, or exact fixed version. Keep analysis focused on InnoDB denial of service in supported MySQL versions 8.0.25 and prior.

Mitigation direction

  • Apply Oracle July 2021 CPU guidance or a later vendor-supported MySQL update.
  • Check vendor advisories for products that embed or bundle MySQL Server.
  • Restrict MySQL network access to trusted hosts and application tiers.
  • Use monitoring and restart procedures to reduce outage duration.

Validation and detection

  • Inventory MySQL Server instances and record exact versions.
  • Flag Oracle MySQL Server 8.0.25 and earlier for remediation review.
  • Confirm whether Oracle July 2021 CPU or later fixes are applied.
  • Review database availability logs for unexplained hangs or repeat crashes.
  • Verify MySQL ports are not exposed to untrusted networks.
Prepared
Confidence
high
Sources
5

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-2021-2429 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
5.9 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:H/PR:N/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
4Source 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
5.9CVSS 3.1MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H2.23.6Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

5.9Medium
CVSS 3.1 vector shape for CVE-2021-2429Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:H/PR:N/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.