Mod_auth_openidc: dos via empty post in mod_auth_openidc with oidcpreservepost enabled
Summary
| CVE | CVE-2025-3891 |
|---|---|
| State | PUBLISHED |
| Assigner | redhat |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2025-04-29 12:15:32 UTC |
| Updated | 2026-06-29 21:16:36 UTC |
| Description | 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. |
Risk And Classification
Primary CVSS: v3.1 7.5 HIGH from [email protected]
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS: 0.012140000 probability, percentile 0.647880000 (date 2026-07-01)
Problem Types: CWE-248 | NVD-CWE-noinfo | CWE-248 Uncaught Exception
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | [email protected] | Secondary | 7.5 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| 3.1 | [email protected] | Secondary | 7.5 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| 3.1 | CNA | CVSS | 7.5 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
LowPrivileges Required
NoneUser Interaction
NoneScope
UnchangedConfidentiality
NoneIntegrity
NoneAvailability
HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD Known Affected Configurations (CPE 2.3)
| Type | Vendor | Product | Version | Update | Edition | Language |
|---|---|---|---|---|---|---|
| Application | Apache | Http Server | - | All | All | All |
| Operating System | Debian | Debian Linux | 11.0 | All | All | All |
| Operating System | Redhat | Enterprise Linux | 7.0 | All | All | All |
| Operating System | Redhat | Enterprise Linux | 8.0 | All | All | All |
| Operating System | Redhat | Enterprise Linux | 9.0 | All | All | All |
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Red Hat | Red Hat Enterprise Linux 8 | unaffected 8100020250426100353.489197e6 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 8.2 Advanced Update Support | unaffected 8020020250612174445.4cda2c84 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support | unaffected 8040020250618101351.522a0ee4 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support | unaffected 8060020250617090503.ad008a3a * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 8.6 Telecommunications Update Service | unaffected 8060020250617090503.ad008a3a * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 8.6 Update Services For SAP Solutions | unaffected 8060020250617090503.ad008a3a * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 8.8 Telecommunications Update Service | unaffected 8080020250617090716.63b34585 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 8.8 Update Services For SAP Solutions | unaffected 8080020250617090716.63b34585 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 9 | unaffected 0:2.4.10-1.el9_6.2 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 9.0 Update Services For SAP Solutions | unaffected 0:2.4.9.4-1.el9_0.3 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 9.2 Update Services For SAP Solutions | unaffected 0:2.4.9.4-1.el9_2.3 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 9.4 Extended Update Support | unaffected 0:2.4.9.4-4.el9_4.2 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 10 | Not specified | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 7 | Not specified | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| access.redhat.com/errata/RHSA-2025:10004 | [email protected] | access.redhat.com | |
| access.redhat.com/errata/RHSA-2025:10008 | [email protected] | access.redhat.com | |
| access.redhat.com/errata/RHSA-2025:4597 | [email protected] | access.redhat.com | Third Party Advisory |
| access.redhat.com/errata/RHSA-2025:10007 | [email protected] | access.redhat.com | |
| access.redhat.com/errata/RHSA-2025:10010 | [email protected] | access.redhat.com | |
| bugzilla.redhat.com/show_bug.cgi | [email protected] | bugzilla.redhat.com | Issue Tracking |
| access.redhat.com/errata/RHSA-2025:10006 | [email protected] | access.redhat.com | |
| github.com/OpenIDC/mod_auth_openidc/security/advisories/GHSA-x7cf-8wgv-5j86 | [email protected] | github.com | |
| access.redhat.com/errata/RHSA-2025:9396 | [email protected] | access.redhat.com | |
| github.com/OpenIDC/mod_auth_openidc/commit/6a0b5f66c87184dfe0e4400f6bdd4... | [email protected] | github.com | |
| access.redhat.com/security/cve/CVE-2025-3891 | [email protected] | access.redhat.com | Third Party Advisory |
| access.redhat.com/errata/RHSA-2025:10002 | [email protected] | access.redhat.com | |
| access.redhat.com/errata/RHSA-2025:10003 | [email protected] | access.redhat.com | |
| lists.debian.org/debian-lts-announce/2025/05/msg00007.html | af854a3a-2127-422b-91ae-364da2661108 | lists.debian.org | Mailing List, Third Party Advisory |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
Additional Advisory Data
| Source | Time | Event |
|---|---|---|
| CNA | 2025-04-22T11:16:32.159Z | Reported to Red Hat. |
| CNA | 2025-04-29T11:37:07.680Z | Made public. |
There are currently no legacy QID mappings associated with this CVE.