LiveActive security incident?Get immediate response
CVE Record

CVE-2021-2178: Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Replication).

Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Replication). Supported versions that are affected are 5.7.32 and prior and 8.0.22 and prior. Easily exploitable vulnerability allows low 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 6.5 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H).

MediumCVSS 6.5Not KEV-listedUpdated
Discuss exposureBack to CVEs
Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2021-2178 is a MySQL Server vulnerability that can let a low-privileged network user crash or hang the database. The documented impact is denial of service, not data theft or data modification. Business urgency is highest where MySQL availability directly supports customer-facing or operational systems.

Executive priority

Treat as a service availability risk. Prioritize systems where MySQL downtime would interrupt revenue, customer access, or critical operations, especially if reachable by many internal users or external services.

Technical view

Oracle identifies this as a MySQL Server Replication component issue affecting 5.7.32 and prior and 8.0.22 and prior. CVSS 3.1 is 6.5 with network attack vector, low complexity, low privileges required, no user interaction, and high availability impact only.

Likely exposure

Exposure is likely for affected MySQL Server versions reachable over the network by authenticated low-privileged users or services. Internet-exposed databases, shared database platforms, and environments with broad application credentials deserve priority review.

Exploitation context

The supplied sources do not show CISA KEV listing or active exploitation. The CVSS vector indicates easy network exploitation by a low-privileged attacker, but the public bundle does not provide root-cause detail or exploit status.

Researcher notes

The bundle names the affected component and CVSS vector but does not include CWE, root cause, proof-of-concept status, or exact fixed build numbers. Avoid assuming confidentiality or integrity impact; validate remediation through Oracle, Fedora, or downstream vendor advisories.

Mitigation direction

  • Upgrade affected MySQL Server deployments using Oracle April 2021 CPU guidance or trusted distribution packages.
  • Apply relevant Fedora or downstream vendor updates where MySQL is installed from those channels.
  • Restrict MySQL network access to trusted application hosts and administrative networks.
  • Review and remove unnecessary low-privileged MySQL accounts.
  • Check NetApp or appliance vendor guidance before patching bundled MySQL components.

Validation and detection

  • Inventory MySQL Server versions and flag 5.7.32 and prior or 8.0.22 and prior.
  • Confirm whether MySQL is reachable from untrusted networks or broad internal segments.
  • Review user accounts with low privileges that can authenticate over the network.
  • Verify package or vendor advisory status after remediation.
  • Monitor database availability logs for repeated crashes or hangs.
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

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cve · low confidence lookup

CVE-2021-2178 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

Open ATT&CK lookup
Vulnerability profileCVE Program record
Severity
Medium
CVSS
6.5 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:L/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
6.5CVSS 3.1MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H2.83.6Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

6.5Medium
CVSS 3.1 vector shape for CVE-2021-2178Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:L/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 Server5.7.32 and prior, 8.0.22 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.