CVE-2024-20918Network attack vector

Data access and modification via undisclosed HotSpot flaw

Published Jan 16, 2024 · Updated Nov 3, 2025

Improper access control in HotSpot in Oracle Java SE 8u391, 8u391-perf, 11.0.21, 17.0.9, and 21.0.1 allows remote attackers to read or modify data. Oracle has not disclosed the affected HotSpot API or the incorrect operation it performs on untrusted input. Exploitation requires a high-complexity path that supplies data to HotSpot APIs through a service, or untrusted code running inside a sandboxed Java client deployment; successful attacks expose or alter Java-accessible data.

CVSS severity7.4
High
EPSS probability0.92%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in HotSpot in Oracle Java SE 8u391, 8u391-perf, 11.0.21, 17.0.9, and 21.0.1 allows remote attackers to read or modify data. Oracle has not disclosed the affected HotSpot API or the incorrect operation it performs on untrusted input. Exploitation requires a high-complexity path that supplies data to HotSpot APIs through a service, or untrusted code running inside a sandboxed Java client deployment; successful attacks expose or alter Java-accessible data.

The record

CVE
CVE-2024-20918
Published
Jan 16, 2024
Updated
Nov 3, 2025
Vendor
Oracle Corporation
Product
Java Platform, Standard Edition (Java SE)
Classifications
CWE-284, T1203, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 16, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 3, 2025Record 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=Oracle GraalVM Enterprise Edition:20.3.12
  2. Affected versionversion=Oracle GraalVM Enterprise Edition:21.3.8
  3. Affected versionversion=Oracle GraalVM Enterprise Edition:22.3.4
  4. Affected versionversion=Oracle GraalVM for JDK:17.0.9
  5. Affected versionversion=Oracle GraalVM for JDK:21.0.1
  6. Affected versionversion=Oracle Java SE:11.0.21
  7. Affected versionversion=Oracle Java SE:17.0.9
  8. Affected versionversion=Oracle Java SE:21.0.1
  9. Affected versionversion=Oracle Java SE:8u391
  10. Affected versionversion=Oracle Java SE:8u391-perf

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 GraalVM Enterprise Edition:22.3.4; version=Oracle GraalVM for JDK:17.0.9; version=Oracle GraalVM for JDK:21.0.1; version=Oracle Java SE:11.0.21; version=Oracle Java SE:17.0.9; version=Oracle Java SE:21.0.1; version=Oracle Java SE:8u391; version=Oracle Java SE:8u391-perf

Published CVSS scores

7.4Oracle CorporationCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-284Improper Access Control
T1203Exploitation for Client Execution
T1190Exploit Public-Facing Application

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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