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Fencer Vulns
high 7.5

CVE-2023-28625 json

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

published 2023-04-03 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-32293

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.3%
EPSS 1.3% chance of exploitation in 30 days, percentile 70%
public exploits
0
none known

Summary

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`.

Patch / fix

  • openidc mod_auth_openidc 2.4.13.2
  • libapache2-mod-auth-openidc Debian 14, Debian 13, Debian 12 2.4.12.3-2

debian advisories DEBIAN-CVE-2023-28625

  • cjose RHEL 8 0.6.1-4.module+el8.9.0+19469+5b493da9
  • mod_auth_openidc RHEL 8 2.4.9.4-5.module+el8.9.0+18723+672ccf5d
  • mod_auth_openidc RHEL 9 2.4.9.4-4.el9

red hat advisories RHSA-2023:6940RHSA-2023:6365

  • apache2-mod_auth_openidc SLE Module for Server Applications 15 SP7, SLE Module for Server Applications 15 SP6, openSUSE Leap 15.6 2.4.17.1-150600.16.14.1
  • apache2-mod_auth_openidc SLES for SAP 15 SP3, SLES for SAP 15 SP2, SLES for SAP 15 SP1 +14 more 2.3.8-150100.3.25.1
  • apache2-mod_auth_openidc SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES 12 SP5 +4 more 2.4.0-7.9.1

suse advisories SUSE-SU-2025:4532-1SUSE-SU-2023:1849-1SUSE-SU-2023:1837-1

  • cjose AlmaLinux 8 0.6.1-4.module_el8.9.0+3631+0ced13d7
  • mod_auth_openidc AlmaLinux 8 2.4.9.4-5.module_el8.9.0+3631+0ced13d7
  • mod_auth_openidc AlmaLinux 9 2.4.9.4-4.el9

almalinux advisories ALSA-2023:6940ALSA-2023:6365

  • cjose Rocky Linux 8 0.6.1-4.module+el8.9.0+1384+4b58c166
  • mod_auth_openidc Rocky Linux 8 2.4.9.4-5.module+el8.9.0+1384+4b58c166

rocky linux advisories RLSA-2023:6940

  • mod_auth_openidc CBL-Mariner 2.0 2.4.14.2-1

azure linux advisories AZL-26772

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2023-28625 updated cvss 7.5

mod_auth_openidc: NULL pointer dereference when OIDCStripCookies is set and a crafted Cookie header is supplied

  • Red Hat Enterprise Linux AppStream (v. 8) cjose 0.6.1-4.module+el8.9.0+19469+5b493da9, mod_auth_openidc 2.4.9.4-5.module+el8.9.0+18723+672ccf5d
    fixed: vendor fix RHSA-2023:6940
  • Red Hat Enterprise Linux AppStream (v. 9) mod_auth_openidc 2.4.9.4-4.el9
    fixed: vendor fix RHSA-2023:6365
  • Red Hat Enterprise Linux 7 mod_auth_openidc
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
20 mo ago

Exploit prediction

1.32% chance of exploitation in the next 30 days, higher than 70% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • OpenIDC mod_auth_openidc

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.