CVE-2024-20923Network attack vector

Information disclosure through undisclosed JavaFX flaw

Published Feb 17, 2024 · Updated Nov 4, 2025

Information disclosure in JavaFX in Oracle Java SE 8u391 allows remote attackers to read a subset of accessible data. Oracle has not disclosed the specific JavaFX locus or the incorrect operation that exposes the data. Exploitation requires a user to run untrusted code in a sandboxed Java Web Start application or applet; trusted-code server deployments are not affected.

CVSS severity3.1
Low
EPSS probability0.60%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in JavaFX in Oracle Java SE 8u391 allows remote attackers to read a subset of accessible data. Oracle has not disclosed the specific JavaFX locus or the incorrect operation that exposes the data. Exploitation requires a user to run untrusted code in a sandboxed Java Web Start application or applet; trusted-code server deployments are not affected.

The record

CVE
CVE-2024-20923
Published
Feb 17, 2024
Updated
Nov 4, 2025
Vendor
Oracle Corporation
Product
Java Platform, Standard Edition (Java SE)
Classifications
CWE-693, T1005
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 17, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 4, 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=Oracle GraalVM Enterprise Edition:20.3.12
  2. Affected versionversion=Oracle GraalVM Enterprise Edition:21.3.8
  3. Affected versionversion=Oracle Java SE:8u391

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Oracle Corporation · Java Platform, Standard Edition (Java SE)version=Oracle GraalVM Enterprise Edition:20.3.12; version=Oracle GraalVM Enterprise Edition:21.3.8; version=Oracle Java SE:8u391

Published CVSS scores

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

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-693Protection Mechanism Failure
T1005Data from Local System

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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