CVE-2025-21495Network attack vector

Authenticated hang or repeated crash

Published Jan 21, 2025 · Updated Jan 23, 2025

Denial of service in Oracle MySQL Enterprise Firewall allows remote authenticated users to hang or repeatedly crash affected servers. Oracle has not disclosed the Firewall component's faulty operation or the crafted input that reaches it. Exploitation requires high database privileges, network access over the MySQL protocol, and high attack complexity; no confidentiality or integrity impact is reported.

CVSS severity4.4
Medium
EPSS probability0.54%
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 Enterprise Firewall allows remote authenticated users to hang or repeatedly crash affected servers. Oracle has not disclosed the Firewall component's faulty operation or the crafted input that reaches it. Exploitation requires high database privileges, network access over the MySQL protocol, and high attack complexity; no confidentiality or integrity impact is reported.

The record

CVE
CVE-2025-21495
Published
Jan 21, 2025
Updated
Jan 23, 2025
Vendor
Oracle Corporation
Product
MySQL Enterprise Firewall
Classifications
CWE-770, T1499
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Jan 21, 2025CVE publishedPublication date reported by the CVE source.
  2. Jan 23, 2025Record 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=* <=8.0.40
  2. Affected versionversion=* <=8.4.3
  3. Affected versionversion=* <=9.1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Oracle Corporation · MySQL Enterprise Firewallversion=* <=8.0.40; version=* <=8.4.3; version=* <=9.1.0

Published CVSS scores

4.4Oracle CorporationCVSS:3.1/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.

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)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
T1499Endpoint Denial of Service

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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