CVE-2024-24814Public exploitNetwork attack vector

Denial of service via unbounded cookie chunk count

Published Feb 13, 2024 · Updated Apr 10, 2025

Denial of service in OpenIDC mod_auth_openidc 2.0.0 through 2.4.15.1 allows remote attackers to hang or crash Apache via a cookie. The oidc_util_get_chunked_cookie function accepts an unbounded cookie-derived count as its loop limit and searches for that many chunk cookies. The vulnerable path requires OIDCSessionType client-cookie; crafted requests can consume workers until the service hangs or crashes.

CVSS severity7.5
High
EPSS probability1.26%
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 OpenIDC mod_auth_openidc 2.0.0 through 2.4.15.1 allows remote attackers to hang or crash Apache via a cookie. The oidc_util_get_chunked_cookie function accepts an unbounded cookie-derived count as its loop limit and searches for that many chunk cookies. The vulnerable path requires OIDCSessionType client-cookie; crafted requests can consume workers until the service hangs or crashes.

The record

CVE
CVE-2024-24814
Published
Feb 13, 2024
Updated
Apr 10, 2025
Vendor
OpenIDC
Product
mod_auth_openidc
Classifications
CWE-400, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 13, 2024CVE publishedPublication date reported by the CVE source.
  2. Apr 10, 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=>= 2.0.0, < 2.4.15.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

OpenIDC · mod_auth_openidcversion=>= 2.0.0, < 2.4.15.2

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

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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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-400Uncontrolled Resource Consumption
T1499.004Endpoint Denial of Service: Application 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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