CVE-2021-35621

Cluster takeover via Data Node buffer overflow

Published Oct 20, 2021 · Updated Sep 25, 2024

A buffer overflow in Data Node job processing in Oracle MySQL Cluster allows attackers to take over the affected cluster. Data Node job processing copies user-supplied data into a buffer without first validating its length, enabling an out-of-bounds write. Oracle's assessment requires a high-privileged attacker on an adjacent physical communication segment and human interaction by another person.

CVSS severity6.3
Medium
EPSS probability50.02%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A buffer overflow in Data Node job processing in Oracle MySQL Cluster allows attackers to take over the affected cluster. Data Node job processing copies user-supplied data into a buffer without first validating its length, enabling an out-of-bounds write. Oracle's assessment requires a high-privileged attacker on an adjacent physical communication segment and human interaction by another person.

The record

CVE
CVE-2021-35621
Published
Oct 20, 2021
Updated
Sep 25, 2024
Vendor
Oracle Corporation
Product
MySQL Cluster
Classifications
T1210
Attack vector
adjacent
Privileges
admin

Timeline

How it unfolded

  1. Oct 20, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 25, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=7.4.33 and prior
  2. Affected versionversion=7.5.23 and prior
  3. Affected versionversion=7.6.19 and prior
  4. Affected versionversion=8.0.26 and prior

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesadmin

What is affected?

Oracle Corporation · MySQL Clusterversion=7.4.33 and prior; version=7.5.23 and prior; version=7.6.19 and prior; version=8.0.26 and prior

Published CVSS scores

6.3Oracle CorporationCVSS:3.1/AV:A/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:H
4.0NISTAV:A/AC:H/Au:S/C:P/I:P/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1210Exploitation of Remote Services

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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