CVE-2025-3891

Mod_auth_openidc: dos via empty post in mod_auth_openidc with oidcpreservepost enabled

State: Published
Severity: 7.5 High
Published: Apr 29, 2025
Updated: Jun 29, 2026
Reserved: Apr 23, 2025

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.

Scores

CVSS	Score	Vector	Source
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	redhat

Weaknesses

CWE-248 Uncaught Exception

Affected Products

Product	Versions
mod_auth_openidc	2.0.0 to before 2.4.13.1Affected
Red Hat Enterprise Linux 8Red Hat	8100020250426100353.489197e6 and laterNot affected
Red Hat Enterprise Linux 8.2 Advanced Update SupportRed Hat	8020020250612174445.4cda2c84 and laterNot affected
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportRed Hat	8040020250618101351.522a0ee4 and laterNot affected
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update SupportRed Hat	8060020250617090503.ad008a3a and laterNot affected
Red Hat Enterprise Linux 8.6 Telecommunications Update ServiceRed Hat	8060020250617090503.ad008a3a and laterNot affected
Red Hat Enterprise Linux 8.6 Update Services for SAP SolutionsRed Hat	8060020250617090503.ad008a3a and laterNot affected
Red Hat Enterprise Linux 8.8 Telecommunications Update ServiceRed Hat	8080020250617090716.63b34585 and laterNot affected
Red Hat Enterprise Linux 8.8 Update Services for SAP SolutionsRed Hat	8080020250617090716.63b34585 and laterNot affected
Red Hat Enterprise Linux 9Red Hat	0:2.4.10-1.el9_6.2 and laterNot affected
Red Hat Enterprise Linux 9.0 Update Services for SAP SolutionsRed Hat	0:2.4.9.4-1.el9_0.3 and laterNot affected
Red Hat Enterprise Linux 9.2 Update Services for SAP SolutionsRed Hat	0:2.4.9.4-1.el9_2.3 and laterNot affected
Red Hat Enterprise Linux 9.4 Extended Update SupportRed Hat	0:2.4.9.4-4.el9_4.2 and laterNot affected
Red Hat Enterprise Linux 10Red Hat
Red Hat Enterprise Linux 7Red Hat

References

RHSA-2025:10002vendor-advisory
RHSA-2025:10003vendor-advisory
RHSA-2025:10004vendor-advisory
RHSA-2025:10006vendor-advisory
RHSA-2025:10007vendor-advisory
RHSA-2025:10008vendor-advisory
RHSA-2025:10010vendor-advisory
RHSA-2025:4597vendor-advisory
RHSA-2025:9396vendor-advisory
https://access.redhat.com/security/cve/CVE-2025-3891vdb-entry
RHBZ#2361633issue-tracking
https://github.com/OpenIDC/mod_auth_openidc/commit/6a0b5f66c87184dfe0e4400f6bdd46a82dc0ec2b
https://github.com/OpenIDC/mod_auth_openidc/security/advisories/GHSA-x7cf-8wgv-5j86
https://lists.debian.org/debian-lts-announce/2025/05/msg00007.html

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