Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Apache | Http Server | - |
| Redhat | Enterprise Linux | 7.0 |
| Debian | Debian Linux | 11.0 |
Related Weaknesses (CWE)
References
- https://access.redhat.com/errata/RHSA-2025:10002
- https://access.redhat.com/errata/RHSA-2025:10003
- https://access.redhat.com/errata/RHSA-2025:10004
- https://access.redhat.com/errata/RHSA-2025:10006
- https://access.redhat.com/errata/RHSA-2025:10007
- https://access.redhat.com/errata/RHSA-2025:10008
- https://access.redhat.com/errata/RHSA-2025:10010
- https://access.redhat.com/errata/RHSA-2025:4597Third Party Advisory
- https://access.redhat.com/errata/RHSA-2025:9396
- https://access.redhat.com/security/cve/CVE-2025-3891Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2361633Issue Tracking
- https://github.com/OpenIDC/mod_auth_openidc/commit/6a0b5f66c87184dfe0e4400f6bdd4
- https://github.com/OpenIDC/mod_auth_openidc/security/advisories/GHSA-x7cf-8wgv-5
- https://lists.debian.org/debian-lts-announce/2025/05/msg00007.htmlMailing ListThird Party Advisory
FAQ
What is CVE-2025-3891?
CVE-2025-3891 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 OIDCPrese...
How severe is CVE-2025-3891?
CVE-2025-3891 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-3891?
Check the references section above for vendor advisories and patch information. Affected products include: Apache Http Server, Redhat Enterprise Linux, Debian Debian Linux.