CVE-2024-21144Network attack vector

Service slowdown via improper Pack200 header validation

Published Jul 16, 2024 · Updated Mar 25, 2025

Improper Pack200 header validation in Oracle Java SE and GraalVM Enterprise Edition allows remote attackers to cause a service slowdown. The Pack200 loader accepts malformed header values without adequate validation, causing disproportionate processing time while loading a crafted archive. Exploitation requires sandboxed Java Web Start or applet code from an untrusted source; servers loading only trusted code are unaffected.

CVSS severity3.7
Low
EPSS probability1.06%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper Pack200 header validation in Oracle Java SE and GraalVM Enterprise Edition allows remote attackers to cause a service slowdown. The Pack200 loader accepts malformed header values without adequate validation, causing disproportionate processing time while loading a crafted archive. Exploitation requires sandboxed Java Web Start or applet code from an untrusted source; servers loading only trusted code are unaffected.

The record

CVE
CVE-2024-21144
Published
Jul 16, 2024
Updated
Mar 25, 2025
Vendor
Oracle Corporation
Product
Java Platform, Standard Edition (Java SE)
Classifications
T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 16, 2024CVE publishedPublication date reported by the CVE source.
  2. Mar 25, 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:20.3.14
  2. Affected versionversion=Oracle GraalVM Enterprise Edition:21.3.10
  3. Affected versionversion=Oracle Java SE:11.0.23
  4. Affected versionversion=Oracle Java SE:8u411
  5. Affected versionversion=Oracle Java SE:8u411-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:20.3.14; version=Oracle GraalVM Enterprise Edition:21.3.10; version=Oracle Java SE:11.0.23; version=Oracle Java SE:8u411; version=Oracle Java SE:8u411-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

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

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Your stack

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