CVE-2021-2385Known exploitationNetwork attack vector

High-impact replication flaw enables crash and data modification

Published Jul 20, 2021 · Updated Sep 26, 2024

Integrity and availability vulnerability in Oracle MySQL MySQL Server 5.7.34 and earlier and 8.0.25 and earlier allows remote authenticated users to disrupt the server or modify data via the MySQL replication protocol. Oracle identifies the vulnerable locus only as the Server: Replication component and does not publicly describe the specific faulty operation on untrusted input. Exploitation requires high privileges and network access; successful attacks can hang or repeatedly crash the server and permit unauthorized updates, inserts, or deletes.

CVSS severity5.0
Medium
EPSS probability1.87%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integrity and availability vulnerability in Oracle MySQL MySQL Server 5.7.34 and earlier and 8.0.25 and earlier allows remote authenticated users to disrupt the server or modify data via the MySQL replication protocol. Oracle identifies the vulnerable locus only as the Server: Replication component and does not publicly describe the specific faulty operation on untrusted input. Exploitation requires high privileges and network access; successful attacks can hang or repeatedly crash the server and permit unauthorized updates, inserts, or deletes.

The record

CVE
CVE-2021-2385
Published
Jul 20, 2021
Updated
Sep 26, 2024
Vendor
Oracle Corporation
Product
MySQL Server
Classifications
T1210
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Jul 20, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 26, 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=5.7.34 and prior
  2. Affected versionversion=8.0.25 and prior

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Oracle Corporation · MySQL Serverversion=5.7.34 and prior; version=8.0.25 and prior

Published CVSS scores

5.0Oracle CorporationCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/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.

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

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 exploitationReported
Public exploitUnconfirmed

Weakness, pattern, technique

T1210Exploitation of Remote Services

Public exploit references

No public exploit references are available in this record.

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Reported exploitation

Technologies

Your stack

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Your stack

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