Public vulnerability disclosure
CVE-2025-3891
Mod_auth_openidc: dos via empty post in mod_auth_openidc with oidcpreservepost enabled
publishedCWE-248
A flaw was found in the mod_auth_openidc module for Apache httpd. This flaw allows a remote, unauthenticated attacker to trigger a denial of service by sending an empty POST request when the OIDCPreservePost directive is enabled. The server crashes consistently, affecting availability.
Technical severity7.5 highCVSS 3.1 · CNA: redhat
Published2025-04-29Source updated 2026-11-04
Collected2026-11-042 attributed sources
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
mod_auth_openidc
https://github.com/OpenIDC/mod_auth_openidc |
≥ 2.0.0; < 2.4.13.1 (affected, semver)
Other versions: unaffected |
CNA: redhat |
| Red Hat Enterprise Linux 8 Red Hat mod_auth_openidc:2.3
https://access.redhat.com/downloads/content/package-browser/ |
≥ 8100020250426100353.489197e6; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat Enterprise Linux 8.2 Advanced Update Support Red Hat mod_auth_openidc:2.3
https://access.redhat.com/downloads/content/package-browser/ |
≥ 8020020250612174445.4cda2c84; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support Red Hat mod_auth_openidc:2.3
https://access.redhat.com/downloads/content/package-browser/ |
≥ 8040020250618101351.522a0ee4; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support Red Hat mod_auth_openidc:2.3
https://access.redhat.com/downloads/content/package-browser/ |
≥ 8060020250617090503.ad008a3a; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat Enterprise Linux 8.6 Telecommunications Update Service Red Hat mod_auth_openidc:2.3
https://access.redhat.com/downloads/content/package-browser/ |
≥ 8060020250617090503.ad008a3a; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions Red Hat mod_auth_openidc:2.3
https://access.redhat.com/downloads/content/package-browser/ |
≥ 8060020250617090503.ad008a3a; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat Enterprise Linux 8.8 Telecommunications Update Service Red Hat mod_auth_openidc:2.3
https://access.redhat.com/downloads/content/package-browser/ |
≥ 8080020250617090716.63b34585; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions Red Hat mod_auth_openidc:2.3
https://access.redhat.com/downloads/content/package-browser/ |
≥ 8080020250617090716.63b34585; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat Enterprise Linux 9 Red Hat mod_auth_openidc
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:2.4.10-1.el9_6.2; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions Red Hat mod_auth_openidc
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:2.4.9.4-1.el9_0.3; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions Red Hat mod_auth_openidc
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:2.4.9.4-1.el9_2.3; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat Enterprise Linux 9.4 Extended Update Support Red Hat mod_auth_openidc
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:2.4.9.4-4.el9_4.2; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat Enterprise Linux 10 Red Hat mod_auth_openidc
https://access.redhat.com/downloads/content/package-browser/ |
Range not reported
Other versions: affected |
CNA: redhat |
| Red Hat Enterprise Linux 7 Red Hat mod_auth_openidc
https://access.redhat.com/downloads/content/package-browser/ |
Range not reported
Other versions: unaffected |
CNA: redhat |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 3.1 / 7.5 high |
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | CNA: redhat |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://access.redhat.com/errata/RHSA-2025:10002CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2025:10003CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2025:10004CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2025:10006CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2025:10007CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2025:10008CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2025:10010CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2025:4597CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2025:9396CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2025-3891CNA: redhat · vdb-entry, x_refsource_REDHAT
- https://bugzilla.redhat.com/show_bug.cgi?id=2361633CNA: redhat · issue-tracking, x_refsource_REDHAT
- https://github.com/OpenIDC/mod_auth_openidc/commit/6a0b5f66c87184dfe0e4400f6bdd46a82dc0ec2bCNA: redhat
- https://github.com/OpenIDC/mod_auth_openidc/security/advisories/GHSA-x7cf-8wgv-5j86CNA: redhat
- https://lists.debian.org/debian-lts-announce/2025/05/msg00007.htmlADP: CVE
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