CVE-2023-36478Public exploitNetwork attack vector

Memory exhaustion via HPACK length integer overflow

Published Oct 10, 2023 · Updated Feb 13, 2025

Denial of service in Eclipse Jetty 9.3.0 through 9.4.52, 10.0.0 through 10.0.15, and 11.0.0 through 11.0.15 allows remote attackers to exhaust memory. MetaDataBuilder.checkSize multiplies a Huffman-coded length by four before dividing by three, allowing integer wraparound to bypass the header-size limit. An unauthenticated HTTP/2 client can trigger gigabyte-scale allocations in Huffman.decode until garbage-collection timing, concurrency, and available memory cause the server to stop serving requests.

CVSS severity7.5
High
EPSS probability3.75%
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 Eclipse Jetty 9.3.0 through 9.4.52, 10.0.0 through 10.0.15, and 11.0.0 through 11.0.15 allows remote attackers to exhaust memory. MetaDataBuilder.checkSize multiplies a Huffman-coded length by four before dividing by three, allowing integer wraparound to bypass the header-size limit. An unauthenticated HTTP/2 client can trigger gigabyte-scale allocations in Huffman.decode until garbage-collection timing, concurrency, and available memory cause the server to stop serving requests.

The record

CVE
CVE-2023-36478
Published
Oct 10, 2023
Updated
Feb 13, 2025
Vendor
The Eclipse Foundation
Product
Eclipse Jetty
Classifications
CWE-400, CWE-190, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 10, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 13, 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=>= 10.0.0, < 10.0.16
  2. Affected versionversion=>= 11.0.0, < 11.0.16
  3. Affected versionversion=>= 9.3.0, < 9.4.53

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Eclipse Foundation · Eclipse Jettyversion=>= 10.0.0, < 10.0.16; version=>= 11.0.0, < 11.0.16; version=>= 9.3.0, < 9.4.53

Published CVSS scores

7.5GitHubCVSS:3.1/AV:N/AC:L/PR:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
CWE-190Integer Overflow or Wraparound
T1499.004Application or System Exploitation

Public exploit references

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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