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CVE-2021-35594

INDEX BUILT · 2026-09-20

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Vulnerability in the MySQL Cluster product of Oracle MySQL (component: Cluster: General)

CVE-2021-355944 of 4 sources documented this
34

rank 34 = 13 + 16 + 0 + 5 + 0

rank@v1 · scheduled

Someone is already using it

CISA KEV catalog · public proof-of-concept · FIRST EPSS

EPSS 0.51136  ·  without this subject the record ranks 21

What it costs you if it fires

NVD CVSS base score, then the CNA's own

CVSS 6.3, from NVD  ·  without this subject the record ranks 18

It is getting worse, not staying still

FIRST EPSS series, rescorings and bad loads removed

no persisting rise in 365 days  ·  without this subject the record ranks 34

How much of the world it touches

NVD CPE configurations

4 products in the CPE ranges  ·  without this subject the record ranks 29

Someone else already set the date

CISA KEV remediation due date

no CISA due date  ·  without this subject the record ranks 34

Unaudited dollar value2 of 3 inputs carry a receipt
Exposure$2.55Mover the next 30 days, if this record is yours
Movement+$1.64Mon 2025-07-21, the last material move, 1 year before this reading
Basisassumeda published average, not your estate

$2.55M = $4.99M incident cost x 1 exposure x 0.51136 likelihood

udv@v1 · unaudited · wrong for you until you say what you run

$4.99M is the cost of a breach that happened, from IBM Cost of a Data Breach Report 2026, global average. It is not the value of any asset of yours. That average already covers breaches of every severity, so scaling it by exposure understates a partial-impact record. That is an assumption, not a measurement. Your own asset value goes in the decision record.

Hindsight · the state

0.51136EPSSNOT IN KEVas of 2026-09-20
Severity6.3 MEDIUMreceipt
Harmtotal lossreceipt
Exploitationnone in held sources
Defenseno fix version held
Movementrisenreceipt
PLATEAU10Minimal movement since 2026-06-15, 59 days at 0.51, as of 2026-08-13. arc-rules@v1

Foresight · where to check next

No weakness class or product neighbourhood is held for this record, so this index cannot name anywhere to check next. That is an absence in the record, not a finding about the software.

Color is a claim, not decoration:the hostile worldthe defenseno signal

Running Oracle Corporation MySQL Cluster? Check your version

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Harm, if it fires from the vector and the weakness

Written for the ticket you're about to file.

Reachreachable from an adjacent network · high privileges required · user interaction required · high attack complexityreceipt
ImpactComplete confidentiality, integrity and availability lossreceipt
Scored fromCVSS v3.1 · the CNA's vectorreceipt
Weakness classCWE-129 Improper Validation of Array Indexreceipt
Published consequencesCWE-129: Integrity, Availability: DoS: Crash, Exit, or Restart; Integrity: Modify Memory; Confidentiality, Integrity: Modify Memory, Read Memory…[email protected]

CISA KEV & Federal Remediation Deadline from the record and CISA

The fix, and how long it's been waiting.

Fixed inNo fix version in held sources, as the index stood on 13 Aug 2026.
Patch available sinceNo dated patch-availability record in held sources. The index holds reference URLs without dates and only the current revision of the CVE record, so the day a fix first existed cannot be derived. Only the versions it landed in.

Exploit Status & Known PoCs a ladder, not a score

Current rung: Nothing observed in held sources.

  • RUNG 1Nothing observed in held sources
  • RUNG 2Proof-of-concept published
  • RUNG 3Exploited in the wild · CISA KEV listed
  • RUNG 4Ransomware campaign use known

Authority who says so

CVSS, the CNA6.3 MEDIUMreceipt
CVSS, NVD6.3 MEDIUMreceipt
Exploit probability0.51136 · top 1% of all CVEsreceipt
Blast breadth1 product across 1 vendorderived
Assigned byoraclereceipt
Recorded changes26 · last 19 Sep 2026derived

Affected & Fixed Versions as published

Affected productOracle Corporation MySQL Clusterreceipt
Published rangesoracle mysql cluster >= 7.4.0 <= 7.4.33; oracle mysql cluster >= 7.5.0 <= 7.5.23; oracle mysql cluster >= 7.6.0 <= 7.6.19; oracle mysql cluster >= 8.0.0 <= 8.0.26receipt

A rung lights from a row in the index, never from an assessment. "Held sources" is the true scope of the claim: this index reads the CVE record, NVD, CISA KEV, FIRST's EPSS and public proof-of-concept repositories, and it does not observe attacks.

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What it is stated by the CNA

Vulnerability in the MySQL Cluster product of Oracle MySQL (component: Cluster: General). Supported versions that are affected are 7.4.33 and prior, 7.5.23 and prior, 7.6.19 and prior and 8.0.26 and prior. Difficult to exploit vulnerability allows high privileged attacker with access to the physical communication segment attached to the hardware where the MySQL Cluster executes to compromise MySQL Cluster. Successful attacks require human interaction from a person other than the attacker. Successful attacks of this vulnerability can result in takeover of MySQL Cluster. CVSS 3.1 Base Score 6.3 (Confidentiality, Integrity and Availability impacts). receipt

Read the rest of the CNA's description

CVSS Vector: (CVSS:3.1/AV:A/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:H).

NVD's analysis a second authority

severity
6.3 CVSS:3.1/AV:A/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:H
weakness
CWE-129
affected versions
oracle mysql cluster >= 7.4.0 <= 7.4.33; oracle mysql cluster >= 7.5.0 <= 7.5.23; oracle mysql cluster >= 7.6.0 <= 7.6.19; and 1 more, listed in full below
also scored by
[email protected] 6.3 CVSS:3.1/AV:A/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:H

check it yourself oracle.com zerodayinitiative.com security.netapp.com receipt

Dated events

2023-03-07EPSS moved 0.01 to 0.082025-07-21EPSS moved 0.07 to 0.392026-06-15EPSS moved 0.39 to 0.50

Movement the material steps

21 Oct 20210.00624
7 Mar 20230.08478 · scoring model v2023.03.01
17 Mar 20250.02165 · scoring model v2025.03.14
21 Jul 20250.39342 · crossed 0.10
15 Jun 20260.50034 · crossed 0.50 · scoring model v2026.06.15
13 Aug 20260.51136
Show all 26 observations
21 Oct 20210.00624
23 Oct 20210.00833
6 Jan 20220.0363
4 Feb 20220.01412
1 Apr 20220.0089
7 Mar 20230.08478
13 May 20230.07452
28 May 20230.05403
11 Jun 20230.03887
21 Mar 20240.03604
30 Apr 20240.03545
28 Aug 20240.03870
6 Nov 20240.02869
6 Jan 20250.02688
22 Feb 20250.02850
17 Mar 20250.02165
29 Mar 20250.05502
30 Mar 20250.02443
20 Apr 20250.05217
13 May 20250.05699
14 May 20250.06539
21 Jul 20250.39342
18 Nov 20250.42881
21 Nov 20250.39342
15 Jun 20260.50034
13 Aug 20260.51136

26 observations held. A highlighted step crossed a promotion threshold. A step marked with a scoring model moved because the instrument was replaced, not because the vulnerability changed. receipt

The full biography

EPSS 0.51136Published2021-10-20Index as of2026-08-13

The record had been public for 4 years, 9 months when this index was last written.

Published 2021-10-20 receipt · Index as of 2026-08-13 derived

Siblings and hubs

Records related to this one

Its defect family

oracle corporation mysql cluster

Grouped by shared product and weakness, not by shared vulnerability. Each record's own state is on its own page.

Family membership: held values

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What usually comes next

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