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CVE Record

CVE-2021-2146: Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Options).

Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Options). Supported versions that are affected are 5.7.33 and prior and 8.0.23 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-2021-2146 is a MySQL Server denial-of-service issue. An attacker who already has high privileges and network access can make affected MySQL versions hang or crash repeatedly. The published impact is service outage, not data theft.

Executive priority

Treat this as a targeted availability risk for critical database services. It is not described as data compromise, but privileged misuse or credential compromise could turn it into a service outage. Prioritize systems supporting revenue, customer access, or operational workflows.

Technical view

Oracle describes a vulnerability in MySQL Server, component Server: Options, affecting 5.7.33 and prior and 8.0.23 and prior. It is network reachable across multiple protocols, low complexity, requires high privileges, no user interaction, and impacts availability only. CVSS 3.1 score is 4.9.

Likely exposure

Exposure is likely limited to organizations running affected MySQL Server 5.7 or 8.0 versions where highly privileged database users can connect over the network. Check direct installs, packaged distributions, and vendor appliances that bundle MySQL.

Exploitation context

The source bundle does not show CISA KEV listing or active exploitation. The attacker must already have high privileges, but successful exploitation can cause complete MySQL denial of service through hangs or repeatable crashes.

Researcher notes

The CVSS vector is AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H. Evidence supports a network-reachable, high-privilege MySQL Server availability flaw. The bundle does not include exploit details, CWE mapping, proof of active exploitation, or detailed root-cause information.

Mitigation direction

  • Apply Oracle's April 2021 Critical Patch Update guidance for MySQL Server.
  • Update Fedora, NetApp, or other downstream packages per vendor advisories.
  • Restrict privileged MySQL accounts to necessary administrators and service identities.
  • Limit network access to MySQL from trusted hosts only.
  • Monitor vendor guidance if exact fixed builds differ by distribution or appliance.

Validation and detection

  • Inventory MySQL Server versions and identify 5.7.33 or earlier and 8.0.23 or earlier.
  • Confirm whether any downstream products bundle affected MySQL Server builds.
  • Review privileged MySQL accounts with network login capability.
  • Check database availability logs for unexplained hangs or repeated crashes.
  • Verify remediation against Oracle, Fedora, NetApp, or applicable vendor advisories.
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-2021-2146 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-2021-2146Attack 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 Server5.7.33 and prior, 8.0.23 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.