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CVE Record

CVE-2021-2179: Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Group Replication Plugin).

Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Group Replication Plugin). 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-2021-2179 is a denial-of-service issue in Oracle MySQL Server's Group Replication Plugin. An already high-privileged attacker with network access could make MySQL hang or crash repeatedly. The main business risk is database availability, not data theft or tampering based on the provided CVSS data.

Executive priority

Treat this as a patch-and-hardening item for systems where MySQL availability is business-critical. It is not shown as actively exploited and requires high privileges, but it can still cause full database denial of service.

Technical view

Oracle lists affected MySQL Server versions as 5.7.33 and prior, and 8.0.23 and prior. The vulnerability is network-reachable, low complexity, requires high privileges, and impacts availability only. The affected component is Server: Group Replication Plugin. No CWE, root-cause detail, or exploit procedure is provided in the source bundle.

Likely exposure

Exposure is most likely in environments running affected MySQL versions with Group Replication enabled or installed, where privileged database or service accounts can connect over permitted network protocols.

Exploitation context

The source bundle does not show CISA KEV listing or cited evidence of active exploitation. Exploitation requires high privileges, which reduces broad external risk, but a malicious insider or compromised privileged account could still disrupt service.

Researcher notes

The public bundle gives impact, affected versions, CVSS, and component, but not root cause or a named fixed version. Avoid assuming confidentiality or integrity impact. Prioritize version validation, plugin exposure, privilege boundaries, and vendor-specific advisory mapping.

Mitigation direction

  • Identify MySQL Server instances at 5.7.33 or earlier and 8.0.23 or earlier.
  • Review Oracle April 2021 CPU guidance for applicable MySQL fixes.
  • Apply Fedora, NetApp, or other vendor package updates where relevant.
  • Restrict MySQL network access to trusted administration and application paths.
  • Review privileged MySQL accounts and remove unnecessary access.

Validation and detection

  • Inventory MySQL versions across production, staging, and backup environments.
  • Confirm whether the Group Replication Plugin is installed or enabled.
  • Verify vendor advisory status for Oracle, Fedora, NetApp, or appliance builds.
  • Check monitoring history for unexplained MySQL hangs or repeated crashes.
  • Confirm privileged account access is limited and traceable.
Prepared
Confidence
medium
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-2021-2179 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-2021-2179Attack 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.