Mod_auth_openidc: dos via empty post in mod_auth_openidc with oidcpreservepost enabled
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.5epss 1.4%
exploitation probability
1.4%top 30% of all CVEs
observed exploitation
nono source reports it
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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
mod_auth_openidcRed Hat · Red Hat Enterprise Linux 10Red Hat · Red Hat Enterprise Linux 7Red Hat · Red Hat Enterprise Linux 8Red Hat · Red Hat Enterprise Linux 8.2 Advanced Update SupportRed Hat · Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportRed Hat · Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update SupportRed Hat · Red Hat Enterprise Linux 8.6 Telecommunications Update ServiceRed Hat · Red Hat Enterprise Linux 8.6 Update Services for SAP SolutionsRed Hat · Red Hat Enterprise Linux 8.8 Telecommunications Update ServiceRed Hat · Red Hat Enterprise Linux 8.8 Update Services for SAP SolutionsRed Hat · Red Hat Enterprise Linux 9Red Hat · Red Hat Enterprise Linux 9.0 Update Services for SAP SolutionsRed Hat · Red Hat Enterprise Linux 9.2 Update Services for SAP SolutionsRed Hat · Red Hat Enterprise Linux 9.4 Extended Update SupportReferences
https://access.redhat.com/errata/RHSA-2025:10002https://access.redhat.com/errata/RHSA-2025:10003https://access.redhat.com/errata/RHSA-2025:10004https://access.redhat.com/errata/RHSA-2025:10006https://access.redhat.com/errata/RHSA-2025:10007https://access.redhat.com/errata/RHSA-2025:10008https://access.redhat.com/errata/RHSA-2025:10010https://access.redhat.com/errata/RHSA-2025:4597https://access.redhat.com/errata/RHSA-2025:9396https://access.redhat.com/security/cve/CVE-2025-3891https://bugzilla.redhat.com/show_bug.cgi?id=2361633https://github.com/OpenIDC/mod_auth_openidc/commit/6a0b5f66c87184dfe0e4400f6bdd46a82dc0ec2b