NVD / CVE Program· CNA GitHub_M

CVE-2024-24814: Denial of service when manipulating mod_auth_openidc_session_chunks cookie in mod_auth_openidc

HighCVSS 7.5 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 30/100)

The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
Probability of exploitation in the next 30 days: 1.2% (FIRST EPSS); higher than 69.7% of all records.
Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
According to CISA the attack is automatable: targets can be found by mass scanning.
Fixed version: OpenIDC mod_auth_openidc 2.4.15.2.

Low priority for now. Upgrade to OpenIDC mod_auth_openidc 2.4.15.2 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

mod_auth_openidc is an OpenID Certified™ authentication and authorization module for the Apache 2.x HTTP server that implements the OpenID Connect Relying Party functionality. In affected versions missing input validation on mod_auth_openidc_session_chunks cookie value makes the server vulnerable to a denial of service (DoS) attack. An internal security audit has been conducted and the reviewers found that if they manipulated the value of the mod_auth_openidc_session_chunks cookie to a very large integer, like 99999999, the server struggles with the request for a long time and finally gets back with a 500 error. Making a few requests of this kind caused our server to become unresponsive. Attackers can craft requests that would make the server work very hard (and possibly become unresponsive) and/or crash with minimal effort. This issue has been addressed in version 2.4.15.2. Users are advised to upgrade. There are no known workarounds for this vulnerability.

Published: Feb 13, 2024
Updated: Jun 17, 2026
EPSS: 1.2% · 69th percentile
CWE: CWE-400

Report tools

JSON

Action score

Monitor

Low priority for now.

CVSS: 30 / 40 · 7.5 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 1.2%

CISA SSVC decision

Exploitation: proof of concept
Automatable: yes
Technical impact: partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: 7.5
CNA · GitHub_M: 7.5; agree

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

Not in KEV: no record of exploitation in the wild
No public exploit code on record
A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

Vendor	Product	CPE
openidc	mod auth openidc	cpe:2.3:a:openidc:mod_auth_openidc
debian	debian linux	cpe:2.3:o:debian:debian_linux
fedoraproject	fedora	cpe:2.3:o:fedoraproject:fedora

Versions reported by the vendor

Affected version ranges reported by the assigning authority (GitHub_M). Independent of NVD's CPE analysis and usually ahead of it.

OpenIDC mod_auth_openidc
- >= 2.0.0, < 2.4.15.2affected

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

debian debian linux10.0
fedoraproject fedora39
openidc mod auth openidc2.0.0 and later · up to 2.4.15.1 inclusive

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

Ecosystem	Package	Affected range	Fix
AlmaLinux:8	cjose	before 0.6.1-4.module_el8.9.0+3631+0ced13d7	0.6.1-4.module_el8.9.0+3631+0ced13d7
AlmaLinux:8	cjose	before 0.6.1-4.module_el8.10.0+3881+234adf82	0.6.1-4.module_el8.10.0+3881+234adf82
AlmaLinux:8	cjose-devel	before 0.6.1-4.module_el8.10.0+3881+234adf82	0.6.1-4.module_el8.10.0+3881+234adf82
AlmaLinux:8	cjose-devel	before 0.6.1-4.module_el8.9.0+3631+0ced13d7	0.6.1-4.module_el8.9.0+3631+0ced13d7
AlmaLinux:8	mod_auth_openidc	before 2.4.9.4-6.module_el8.10.0+3881+234adf82	2.4.9.4-6.module_el8.10.0+3881+234adf82
AlmaLinux:9	mod_auth_openidc	before 2.4.10-1.el9	2.4.10-1.el9
Debian:10	libapache2-mod-auth-openidc	before 2.3.10.2-1+deb10u4	2.3.10.2-1+deb10u4
Debian:12	libapache2-mod-auth-openidc	before 2.4.12.3-2+deb12u1	2.4.12.3-2+deb12u1
Debian:13	libapache2-mod-auth-openidc	before 2.4.15.7-1	2.4.15.7-1
openSUSE:Leap 15.5	apache2-mod_auth_openidc	before 2.3.8-150100.3.28.1	2.3.8-150100.3.28.1
openSUSE:Leap 15.6	apache2-mod_auth_openidc	before 2.3.8-150600.16.5.1	2.3.8-150600.16.5.1
openSUSE:Leap 15.6	apache2-mod_auth_openidc	before 2.4.17.1-150600.16.14.1	2.4.17.1-150600.16.14.1
openSUSE:Tumbleweed	apache2-mod_auth_openidc	before 2.4.15.3-1.1	2.4.15.3-1.1
Red Hat:enterprise_linux:8::appstream	cjose	before 0:0.6.1-4.module+el8.10.0+21813+b5444eb8	0:0.6.1-4.module+el8.10.0+21813+b5444eb8
Red Hat:enterprise_linux:8::appstream	cjose-debuginfo	before 0:0.6.1-4.module+el8.10.0+21813+b5444eb8	0:0.6.1-4.module+el8.10.0+21813+b5444eb8
Red Hat:enterprise_linux:8::appstream	cjose-debugsource	before 0:0.6.1-4.module+el8.10.0+21813+b5444eb8	0:0.6.1-4.module+el8.10.0+21813+b5444eb8
Red Hat:enterprise_linux:8::appstream	cjose-devel	before 0:0.6.1-4.module+el8.10.0+21813+b5444eb8	0:0.6.1-4.module+el8.10.0+21813+b5444eb8
Red Hat:enterprise_linux:8::appstream	mod_auth_openidc	before 0:2.4.9.4-6.module+el8.10.0+21813+b5444eb8	0:2.4.9.4-6.module+el8.10.0+21813+b5444eb8
Red Hat:enterprise_linux:8::appstream	mod_auth_openidc-debuginfo	before 0:2.4.9.4-6.module+el8.10.0+21813+b5444eb8	0:2.4.9.4-6.module+el8.10.0+21813+b5444eb8
Red Hat:enterprise_linux:8::appstream	mod_auth_openidc-debugsource	before 0:2.4.9.4-6.module+el8.10.0+21813+b5444eb8	0:2.4.9.4-6.module+el8.10.0+21813+b5444eb8
Red Hat:enterprise_linux:9::appstream	mod_auth_openidc	before 0:2.4.10-1.el9	0:2.4.10-1.el9
Red Hat:enterprise_linux:9::appstream	mod_auth_openidc-debuginfo	before 0:2.4.10-1.el9	0:2.4.10-1.el9
Red Hat:enterprise_linux:9::appstream	mod_auth_openidc-debugsource	before 0:2.4.10-1.el9	0:2.4.10-1.el9
Rocky Linux:8	cjose	before 0:0.6.1-4.module+el8.9.0+1384+4b58c166	0:0.6.1-4.module+el8.9.0+1384+4b58c166

Same product

openidc: all records

Other highest-scoring records for the same primary product.

CVE-2017-6413The "OpenID Connect Relying Party and OAuth 2.0 Resource Server" (aka mod_auth_openidc) module before 2.1.6 for the Apache HTTP Server does…
35Monitor
CVE-2017-6062The "OpenID Connect Relying Party and OAuth 2.0 Resource Server" (aka mod_auth_openidc) module before 2.1.5 for the Apache HTTP Server does…
35Monitor
CVE-2017-6059Mod_auth_openidc.c in the Ping Identity OpenID Connect authentication module for Apache (aka mod_auth_openidc) before 2.14 allows remote…
32Monitor

Published before and after this one in the same product

← EarlierCVE-2021-39191Sep 3, 2021 · URL Redirection to Untrusted Site ('Open Redirect') in mod_auth_openidc
25Monitor
← EarlierCVE-2022-23527Dec 14, 2022 · Open Redirect in oidc_validate_redirect_url()
24Monitor
← EarlierCVE-2023-28625Apr 3, 2023 · mod_auth_openidc core dump when OIDCStripCookies is set and an empty Cookie header is supplied
30Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / package	Fixed version	Source
OpenIDC mod_auth_openidc	2.4.15.2 · description	Vendor (CNA)
almalinux:cjose	0.6.1-4.module_el8.9.0+3631+0ced13d7 · AlmaLinux:8	Package registry (OSV)
almalinux:cjose-devel	0.6.1-4.module_el8.9.0+3631+0ced13d7 · AlmaLinux:8	Package registry (OSV)
almalinux:mod_auth_openidc	2.4.9.4-6.module_el8.10.0+3881+234adf82 · AlmaLinux:8	Package registry (OSV)
debian:libapache2-mod-auth-openidc	2.4.12.3-2+deb12u1 · Debian:12	Package registry (OSV)
opensuse:apache2-mod_auth_openidc	2.3.8-150100.3.28.1 · openSUSE:Leap 15.5	Package registry (OSV)
red hat:cjose	0:0.6.1-4.module+el8.10.0+21813+b5444eb8 · Red Hat:enterprise_linux:8::appstream	Package registry (OSV)
red hat:cjose-debuginfo	0:0.6.1-4.module+el8.10.0+21813+b5444eb8 · Red Hat:enterprise_linux:8::appstream	Package registry (OSV)
red hat:cjose-debugsource	0:0.6.1-4.module+el8.10.0+21813+b5444eb8 · Red Hat:enterprise_linux:8::appstream	Package registry (OSV)
red hat:cjose-devel	0:0.6.1-4.module+el8.10.0+21813+b5444eb8 · Red Hat:enterprise_linux:8::appstream	Package registry (OSV)
red hat:mod_auth_openidc	0:2.4.9.4-6.module+el8.10.0+21813+b5444eb8 · Red Hat:enterprise_linux:8::appstream	Package registry (OSV)
red hat:mod_auth_openidc-debuginfo	0:2.4.9.4-6.module+el8.10.0+21813+b5444eb8 · Red Hat:enterprise_linux:8::appstream	Package registry (OSV)
red hat:mod_auth_openidc-debugsource	0:2.4.9.4-6.module+el8.10.0+21813+b5444eb8 · Red Hat:enterprise_linux:8::appstream	Package registry (OSV)
rocky linux:cjose	0:0.6.1-4.module+el8.9.0+1384+4b58c166 · Rocky Linux:8	Package registry (OSV)
rocky linux:mod_auth_openidc	0:2.4.9.4-6.module+el8.10.0+1846+b7dcd2c3 · Rocky Linux:8	Package registry (OSV)
suse:apache2-mod_auth_openidc	2.3.8-150100.3.28.1 · SUSE:Linux Enterprise Module for Server Applications 15 SP5	Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

OpenIDC/mod_auth_openidccommit 4022c12

Not on record for this CVE: EPSS history · researcher credit · variant or chain candidate · public bounty program.

Technical details

Attack conditions

Anyone who can reach it over the internet can trigger it.
No account or password is required.
No user action is required.
No special conditions are required; it is repeatable.

If successful

Confidentiality: none
Integrity: none
Availability: high · the service can be disrupted

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality impact: None
Integrity impact: None
Availability impact: High

Weakness class (CWE)

CWE-400 · Uncontrolled Resource Consumption

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

nvd-primary

Root cause

Code that parses nested structures sets no depth or size limit. A small input can turn into a disproportionate processing load.

The bug in code

The whole CWE-400 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1function expand(node) {
2  return node.children.map(expand);
3}

Fixed

1const MAX_DEPTH = 32;
2function expand(node, depth = 0) {
3  if (depth > MAX_DEPTH) throw new Error("too deep");
4  return node.children.map((c) => expand(c, depth + 1));
5}

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Attack patterns (CAPEC)

ATT&CK techniques

Endpoint Denial of ServiceT1499

Change log (1)

Fix✗ → ✓Sep 28, 2026, 10:46 PM UTC

For records you follow, these changes also arrive as notifications. →

References

github.com/OpenIDC/mod_auth_openidc/commit/4022c12f314bd89d127d1be008b1a80a08e1203d

Show all references (2 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records