CVE-2024-23837Public exploitNetwork attack vector

Service interruption via unbounded folded headers

Published Feb 26, 2024 · Updated Nov 3, 2025

Resource exhaustion in Open Information Security Foundation LibHTP before 0.5.46 allows remote attackers to interrupt HTTP parsing. Request and response header parsers repeatedly append continuation-line bytes with bstr_add_mem without bounding the folded field, causing quadratic reallocation. Unauthenticated traffic reaching an embedding application's HTTP parser is sufficient, and a sustained folded header can stall traffic inspection.

CVSS severity7.5
High
EPSS probability1.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in Open Information Security Foundation LibHTP before 0.5.46 allows remote attackers to interrupt HTTP parsing. Request and response header parsers repeatedly append continuation-line bytes with bstr_add_mem without bounding the folded field, causing quadratic reallocation. Unauthenticated traffic reaching an embedding application's HTTP parser is sufficient, and a sustained folded header can stall traffic inspection.

The record

CVE
CVE-2024-23837
Published
Feb 26, 2024
Updated
Nov 3, 2025
Vendor
Fedora Project
Product
Fedora Linux
Classifications
CWE-770, T1499.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 26, 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

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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=38
  2. Affected versionversion=39

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Fedora Project · Fedora Linuxversion=38; version=39
Open Information Security Foundation · LibHTPversion=0 <0.5.46; version=< 0.5.46

Published CVSS scores

7.5GitHub, Inc.CVSS: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

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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-770Allocation of Resources Without Limits or Throttling
T1499.003Application Exhaustion Flood

Public exploit references

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Technologies

Your stack

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Your stack

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