high7.5
CVE-2025-3891
A flaw was found in the mod_auth_openidc module for Apache httpd.
Impact
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.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Apache | Http Server | All versions |
| Redhat | Enterprise Linux | Versions 7.0, 8.0, 9.0 |
| Debian | Debian Linux | Version 11.0 |
Weakness classification
References
- NVD record
- CVE.org record
- 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-2025:4597
- https://access.redhat.com/errata/RHSA-2025:9396
- https://access.redhat.com/security/cve/CVE-2025-3891
- https://bugzilla.redhat.com/show_bug.cgi?id=2361633
- 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