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CVE Record

CVE-2021-35546: 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 8.0.26 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

This is a denial-of-service flaw in Oracle MySQL Server. An attacker who already has high privileges and network access can make the database hang or repeatedly crash. It does not indicate data theft or data modification, but affected business systems can lose database availability.

Executive priority

Schedule remediation in normal vulnerability management timelines, accelerating for critical databases or broadly reachable administrative networks. The main business risk is database outage, not data compromise, and exploitation requires high privileges.

Technical view

CVE-2021-35546 affects MySQL Server 8.0.26 and prior in Server: Replication. CVSS 3.1 is 4.9, AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H. The impact is availability only, with complete DoS possible after successful exploitation by a high-privileged network attacker.

Likely exposure

Internet or internal network reachable MySQL Server deployments running 8.0.26 or earlier are in scope, especially where privileged database accounts can access replication/server functions. Exposure is lower where administrative network access is tightly restricted.

Exploitation context

The source bundle does not show CISA KEV listing or other cited evidence of active exploitation. The flaw is described as easily exploitable, but it requires high privileges and network access. Treat it as operationally important for critical database services.

Researcher notes

Evidence is limited to vendor/CVE descriptions and downstream advisories. No CWE is listed in the bundle, and no exploit details are provided. Avoid assuming affected configurations beyond MySQL Server 8.0.26 and prior, component Server: Replication.

Mitigation direction

  • Upgrade MySQL Server according to Oracle October 2021 CPU or later vendor guidance.
  • Check downstream vendor advisories if using NetApp, Fedora, or packaged MySQL builds.
  • Restrict MySQL network access to trusted administrative and application hosts.
  • Review and reduce high-privilege MySQL accounts where feasible.
  • Prioritize resilient monitoring and restart handling for critical MySQL services.

Validation and detection

  • Inventory MySQL Server instances and identify versions 8.0.26 or earlier.
  • Confirm whether affected systems use Oracle, Fedora, NetApp, or other vendor packages.
  • Verify privileged MySQL account exposure and network reachability paths.
  • Check change records for Oracle CPU October 2021 or later remediation.
  • Monitor MySQL logs for unexplained hangs, crashes, or repeated restarts.
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-2021-35546 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-2021-35546Attack 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 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.