CVE-2025-3891

Mod_auth_openidc: dos via empty post in mod_auth_openidc with oidcpreservepost enabled

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.

Category

7.5
CVSS
Severity: High
CVSS 3.1 •
EPSS 1.24% Top 25%
Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory redhat.com
Affected: Red Hat Red Hat Enterprise Linux 8
Affected: Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support
Affected: Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
Affected: Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
Affected: Red Hat Red Hat Enterprise Linux 8.6 Telecommunications Update Service
Affected: Red Hat Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions
Affected: Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service
Affected: Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
Affected: Red Hat Red Hat Enterprise Linux 9
Affected: Red Hat Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions
Affected: Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions
Affected: Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support
Affected: Red Hat Red Hat Enterprise Linux 10
Affected: Red Hat Red Hat Enterprise Linux 7
Published at:
Updated at:

References

Link Tags
https://access.redhat.com/errata/RHSA-2025:10002 vendor advisory
https://access.redhat.com/errata/RHSA-2025:10003 vendor advisory
https://access.redhat.com/errata/RHSA-2025:10004 vendor advisory
https://access.redhat.com/errata/RHSA-2025:10006 vendor advisory
https://access.redhat.com/errata/RHSA-2025:10007 vendor advisory
https://access.redhat.com/errata/RHSA-2025:10008 vendor advisory
https://access.redhat.com/errata/RHSA-2025:10010 vendor advisory
https://access.redhat.com/errata/RHSA-2025:4597 vendor advisory third party advisory
https://access.redhat.com/errata/RHSA-2025:9396 vendor advisory
https://access.redhat.com/security/cve/CVE-2025-3891 vdb entry third party advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2361633 issue tracking
https://lists.debian.org/debian-lts-announce/2025/05/msg00007.html mailing list third party advisory

Frequently Asked Questions

What is the severity of CVE-2025-3891?
CVE-2025-3891 has been scored as a high severity vulnerability.
How to fix CVE-2025-3891?
To fix CVE-2025-3891, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-3891 being actively exploited in the wild?
It is possible that CVE-2025-3891 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-3891?
CVE-2025-3891 affects Red Hat Red Hat Enterprise Linux 8, Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support, Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support, Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support, Red Hat Red Hat Enterprise Linux 8.6 Telecommunications Update Service, Red Hat Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions, Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service, Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions, Red Hat Red Hat Enterprise Linux 9, Red Hat Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions, Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions, Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support, Red Hat Red Hat Enterprise Linux 10, Red Hat Red Hat Enterprise Linux 7.
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