CVE-2024-21208Network attack vector

Sandboxed client interruption via unbounded HTTP responses

Published Oct 15, 2024 · Updated Nov 3, 2025

Resource exhaustion in Oracle Java SE Networking allows remote attackers to interrupt sandboxed Java clients via crafted HTTP responses. Built-in HTTP handlers failed to cap peer-controlled header sizes, interim response counts, and HPACK indexing requests, enabling excessive resource consumption. Exploitation requires a sandboxed Java Web Start application or applet to load untrusted network content; trusted-code server deployments are not affected.

CVSS severity3.7
Low
EPSS probability1.01%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Resource exhaustion in Oracle Java SE Networking allows remote attackers to interrupt sandboxed Java clients via crafted HTTP responses. Built-in HTTP handlers failed to cap peer-controlled header sizes, interim response counts, and HPACK indexing requests, enabling excessive resource consumption. Exploitation requires a sandboxed Java Web Start application or applet to load untrusted network content; trusted-code server deployments are not affected.

The record

CVE
CVE-2024-21208
Published
Oct 15, 2024
Updated
Nov 3, 2025
Vendor
Oracle Corporation
Product
Java Platform, Standard Edition (Java SE)
Classifications
CWE-203, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 15, 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:20.3.15
  2. Affected versionversion=Oracle GraalVM Enterprise Edition:21.3.11
  3. Affected versionversion=Oracle GraalVM for JDK:17.0.12
  4. Affected versionversion=Oracle GraalVM for JDK:21.0.4
  5. Affected versionversion=Oracle GraalVM for JDK:23
  6. Affected versionversion=Oracle Java SE:11.0.24
  7. Affected versionversion=Oracle Java SE:17.0.12
  8. Affected versionversion=Oracle Java SE:21.0.4
  9. Affected versionversion=Oracle Java SE:23
  10. Affected versionversion=Oracle Java SE:8u421
  11. Affected versionversion=Oracle Java SE:8u421-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:20.3.15; version=Oracle GraalVM Enterprise Edition:21.3.11; version=Oracle GraalVM for JDK:17.0.12; version=Oracle GraalVM for JDK:21.0.4; version=Oracle GraalVM for JDK:23; version=Oracle Java SE:11.0.24; version=Oracle Java SE:17.0.12; version=Oracle Java SE:21.0.4; version=Oracle Java SE:23; version=Oracle Java SE:8u421; version=Oracle Java SE:8u421-perf

Published CVSS scores

3.7Oracle CorporationCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

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-203Observable Discrepancy
T1499.004Application or System Exploitation

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo