CVE-2020-2921Network attack vector

Authenticated server crash through undisclosed plugin flaw

Published Apr 15, 2020 · Updated Sep 27, 2024

Denial of service in Oracle MySQL Server 8.0.19 and earlier allows remote authenticated users to crash or hang the server. Oracle identifies the affected locus as the Server Group Replication Plugin but does not disclose the operation it performs incorrectly on untrusted input. Exploitation requires high privileges, network access through the MySQL protocol, and a server configured with the Group Replication plugin; impact is limited to service interruption.

CVSS severity4.4
Medium
EPSS probability1.83%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Oracle MySQL Server 8.0.19 and earlier allows remote authenticated users to crash or hang the server. Oracle identifies the affected locus as the Server Group Replication Plugin but does not disclose the operation it performs incorrectly on untrusted input. Exploitation requires high privileges, network access through the MySQL protocol, and a server configured with the Group Replication plugin; impact is limited to service interruption.

The record

CVE
CVE-2020-2921
Published
Apr 15, 2020
Updated
Sep 27, 2024
Vendor
Oracle Corporation
Product
MySQL Server
Classifications
T1499.004
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Apr 15, 2020CVE publishedPublication date reported by the CVE source.
  2. Sep 27, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=8.0.19 and prior

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Oracle Corporation · MySQL Serverversion=8.0.19 and prior

Published CVSS scores

4.4OracleCVSS:3.0/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H

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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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