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CVE Record

CVE-2021-35608: 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 8.0.26 and prior. Difficult to exploit 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 5.3 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H).

MediumCVSS 5.3Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2021-35608 is a denial-of-service issue in Oracle MySQL Server’s Group Replication Plugin. An attacker with low privileges and network access could cause MySQL Server to hang or repeatedly crash. The impact is service availability, not data theft or modification, based on the supplied CVSS vector.

Executive priority

Treat as a moderate availability risk. Prioritize internet-reachable, business-critical, or replication-dependent MySQL systems. This does not appear to be a confidentiality breach issue from the supplied evidence, but outages can still affect revenue and operations.

Technical view

Oracle lists supported MySQL Server versions 8.0.26 and prior as affected in the Server: Group Replication Plugin component. CVSS 3.1 is 5.3 with network attack vector, high attack complexity, low privileges, no user interaction, unchanged scope, and high availability impact only.

Likely exposure

Exposure is most likely where MySQL Server 8.0.26 or earlier is deployed and reachable by authenticated low-privilege users over supported network protocols. Environments using Group Replication deserve priority review. Fedora and NetApp advisories indicate downstream packaging or product-specific exposure should also be checked.

Exploitation context

The supplied sources do not show active exploitation, and the CVE is not marked as CISA KEV. Oracle describes exploitation as difficult and requiring low privileges plus network access. Successful exploitation can cause a complete denial of service through hangs or repeatable crashes.

Researcher notes

Key constraints are high attack complexity, low privileges required, network reachability, and availability-only impact. The public bundle does not provide exploit details, proof of active exploitation, or complete downstream product impact, so validation should stay focused on affected versions and vendor-specific advisories.

Mitigation direction

  • Apply Oracle’s October 2021 CPU guidance or a later supported MySQL Server update.
  • Apply relevant Fedora package updates where MySQL is managed through Fedora packages.
  • Check NetApp advisory coverage for any NetApp products using affected MySQL components.
  • Restrict MySQL network exposure to trusted hosts and required users only.
  • Review vendor guidance before changing Group Replication Plugin configuration.

Validation and detection

  • Inventory MySQL Server versions and flag 8.0.26 or earlier.
  • Identify whether the Group Replication Plugin is deployed or enabled.
  • Review MySQL access paths for low-privilege users with network reachability.
  • Check package manager history for Fedora MySQL security updates.
  • Review monitoring for unexplained MySQL hangs or repeated crashes.
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-2021-35608 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
5.3 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:H/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
5.3CVSS 3.1MediumCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H1.63.6Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

5.3Medium
CVSS 3.1 vector shape for CVE-2021-35608Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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