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CVE-2023-28625· NVD / CVE Program· CNA GitHub_M

mod_auth_openidc core dump when OIDCStripCookies is set and an empty Cookie header is supplied

mod_auth_openidc is an authentication and authorization module for the Apache 2.x HTTP server that implements the OpenID Connect Relying Party functionality. In versions 2.0.0 through 2.4.13.1, when `OIDCStripCookies` is set and a crafted cookie supplied, a NULL pointer dereference would occur, resulting in a segmentation fault. This could be used in a Denial-of-Service attack and thus presents an availability risk. Version 2.4.13.2 contains a patch for this issue. As a workaround, avoid using `OIDCStripCookies`.

HighCVSS 7.5 · v3.1—No exploit Fix available
Published
Apr 3, 2023
Updated
Jun 17, 2026
EPSS
1.3% · 70th percentile
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Report tools

JSON

Action score

30

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 1.3%

CISA SSVC decision

Exploitation
none
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.

Noroxi analysis

No Noroxi analysis for this record yet

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Affected systems

VendorProduct
openidcmod auth openidc

Affected versions

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

  • openidc mod auth openidc2.0.0 and later · before 2.4.13.2

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, < 2.4.13.2affected

Package-level exposure

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

EcosystemPackageAffected rangeFix
AlmaLinux:8cjosebefore 0.6.1-4.module_el8.9.0+3631+0ced13d70.6.1-4.module_el8.9.0+3631+0ced13d7
AlmaLinux:8cjose-develbefore 0.6.1-4.module_el8.9.0+3631+0ced13d70.6.1-4.module_el8.9.0+3631+0ced13d7
AlmaLinux:8mod_auth_openidcbefore 2.4.9.4-5.module_el8.9.0+3631+0ced13d72.4.9.4-5.module_el8.9.0+3631+0ced13d7
AlmaLinux:9mod_auth_openidcbefore 2.4.9.4-4.el92.4.9.4-4.el9
Debian:10libapache2-mod-auth-openidcbefore 2.3.10.2-1+deb10u22.3.10.2-1+deb10u2
Debian:11libapache2-mod-auth-openidcbefore 2.4.9.4-0+deb11u32.4.9.4-0+deb11u3
Debian:12libapache2-mod-auth-openidcbefore 2.4.12.3-22.4.12.3-2
Red Hat:enterprise_linux:8::appstreamcjosebefore 0:0.6.1-4.module+el8.9.0+19469+5b493da90:0.6.1-4.module+el8.9.0+19469+5b493da9
Red Hat:enterprise_linux:8::appstreamcjose-debuginfobefore 0:0.6.1-4.module+el8.9.0+19469+5b493da90:0.6.1-4.module+el8.9.0+19469+5b493da9
Red Hat:enterprise_linux:8::appstreamcjose-debugsourcebefore 0:0.6.1-4.module+el8.9.0+19469+5b493da90:0.6.1-4.module+el8.9.0+19469+5b493da9
Red Hat:enterprise_linux:8::appstreamcjose-develbefore 0:0.6.1-4.module+el8.9.0+19469+5b493da90:0.6.1-4.module+el8.9.0+19469+5b493da9
Red Hat:enterprise_linux:8::appstreammod_auth_openidcbefore 0:2.4.9.4-5.module+el8.9.0+18723+672ccf5d0:2.4.9.4-5.module+el8.9.0+18723+672ccf5d
Red Hat:enterprise_linux:8::appstreammod_auth_openidc-debuginfobefore 0:2.4.9.4-5.module+el8.9.0+18723+672ccf5d0:2.4.9.4-5.module+el8.9.0+18723+672ccf5d
Red Hat:enterprise_linux:8::appstreammod_auth_openidc-debugsourcebefore 0:2.4.9.4-5.module+el8.9.0+18723+672ccf5d0:2.4.9.4-5.module+el8.9.0+18723+672ccf5d
Red Hat:enterprise_linux:9::appstreammod_auth_openidcbefore 0:2.4.9.4-4.el90:2.4.9.4-4.el9
Red Hat:enterprise_linux:9::appstreammod_auth_openidc-debuginfobefore 0:2.4.9.4-4.el90:2.4.9.4-4.el9
Red Hat:enterprise_linux:9::appstreammod_auth_openidc-debugsourcebefore 0:2.4.9.4-4.el90:2.4.9.4-4.el9
SUSE:Linux Enterprise Module for Server Applications 15 SP4apache2-mod_auth_openidcbefore 2.3.8-150100.3.25.12.3.8-150100.3.25.1
SUSE:Linux Enterprise Module for Server Applications 15 SP4apache2-mod_auth_openidcbefore 2.3.8-150100.3.25.12.3.8-150100.3.25.1
SUSE:Linux Enterprise Module for Server Applications 15 SP6apache2-mod_auth_openidcbefore 2.4.17.1-150600.16.14.12.4.17.1-150600.16.14.1
SUSE:Linux Enterprise Module for Server Applications 15 SP6apache2-mod_auth_openidcbefore 2.4.17.1-150600.16.14.12.4.17.1-150600.16.14.1
SUSE:OpenStack Cloud 9apache2-mod_auth_openidcbefore 2.4.0-7.9.12.4.0-7.9.1

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 att
    32Monitor
  • CVE-2021-32785Format string bug in the Redis cache implementation
    31Monitor
  • CVE-2021-20718mod_auth_openidc 2.4.0 to 2.4.7 allows a remote attacker to cause a denial-of-service (DoS) condition via unspecified vectors.
    31Monitor
  • CVE-2024-24814Denial of service when manipulating mod_auth_openidc_session_chunks cookie in mod_auth_openidc
    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 / packageFixed versionSource
almalinux:cjose0.6.1-4.module_el8.9.0+3631+0ced13d7 · AlmaLinux:8Package registry (OSV)
almalinux:cjose-devel0.6.1-4.module_el8.9.0+3631+0ced13d7 · AlmaLinux:8Package registry (OSV)
almalinux:mod_auth_openidc2.4.9.4-4.el9 · AlmaLinux:9Package registry (OSV)
debian:libapache2-mod-auth-openidc2.4.12.3-2 · Debian:12Package registry (OSV)
opensuse:apache2-mod_auth_openidc2.3.8-150100.3.25.1 · openSUSE:Leap 15.4Package registry (OSV)
red hat:cjose0:0.6.1-4.module+el8.9.0+19469+5b493da9 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:cjose-debuginfo0:0.6.1-4.module+el8.9.0+19469+5b493da9 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:cjose-debugsource0:0.6.1-4.module+el8.9.0+19469+5b493da9 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:cjose-devel0:0.6.1-4.module+el8.9.0+19469+5b493da9 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:mod_auth_openidc0:2.4.9.4-4.el9 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:mod_auth_openidc-debuginfo0:2.4.9.4-4.el9 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:mod_auth_openidc-debugsource0:2.4.9.4-4.el9 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
suse:apache2-mod_auth_openidc2.3.8-150100.3.25.1 · SUSE:Linux Enterprise Module for Server Applications 15 SP4Package registry (OSV)
suse:apache2-mod_auth_openidc2.4.0-7.9.1 · SUSE:OpenStack Cloud 9Package 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.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

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

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

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-476 · NULL Pointer Dereference

CVSS vector

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

nvd-primary

Attack context

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

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

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

References

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

All records