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Vulnerability · Published Apr 29, 2025 · Assigned by redhat

CVE-2025-3891Mod_auth_openidc: dos via empty post in mod_auth_openidc with oidcpreservepost enabled

High 7.5

In plain English

A high-severity security flaw in mod_auth_openidc. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.6% (higher than 76% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.5High
Exploit odds (30 days)1.6%top 24.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:8cjose0.6.1-4.module_el8.9.0+3631+0ced13d7ALSA-2025:4597
AlmaLinux:8cjose0.6.1-4.module_el8.10.0+3881+234adf82ALSA-2025:4597
AlmaLinux:8cjose-devel0.6.1-4.module_el8.9.0+3631+0ced13d7ALSA-2025:4597
AlmaLinux:8cjose-devel0.6.1-4.module_el8.10.0+3881+234adf82ALSA-2025:4597
AlmaLinux:8mod_auth_openidc2.4.9.4-8.module_el8.10.0+3988+526f0275ALSA-2025:4597
AlmaLinux:9mod_auth_openidc2.4.10-1.el9_6.2ALSA-2025:9396
Debian:12libapache2-mod-auth-openidc2.4.12.3-2+deb12u4DEBIAN-CVE-2025-3891
Debian:12libapache2-mod-auth-openidc2.4.12.3-2+deb12u4DSA-5917-1
Debian:13libapache2-mod-auth-openidc2.4.14.2-1DEBIAN-CVE-2025-3891
Debian:14libapache2-mod-auth-openidc2.4.14.2-1DEBIAN-CVE-2025-3891
Rocky Linux:8cjose0:0.6.1-4.module+el8.9.0+1384+4b58c166RLSA-2025:4597
Rocky Linux:8mod_auth_openidc0:2.4.9.4-8.module+el8.10.0+1976+99abe5ebRLSA-2025:4597
Rocky Linux:9mod_auth_openidc0:2.4.10-1.el9_6.2RLSA-2025:9396
Ubuntu:22.04:LTSlibapache2-mod-auth-openidcno fix listedUBUNTU-CVE-2025-3891
Ubuntu:24.04:LTSlibapache2-mod-auth-openidcno fix listedUBUNTU-CVE-2025-3891
Ubuntu:25.10libapache2-mod-auth-openidcno fix listedUBUNTU-CVE-2025-3891
Ubuntu:26.04:LTSlibapache2-mod-auth-openidcno fix listedUBUNTU-CVE-2025-3891
Ubuntu:26.10libapache2-mod-auth-openidcno fix listedUBUNTU-CVE-2025-3891

Affected products (as reported)

VendorProductVersions
mod_auth_openidc 2.0.0 – before 2.4.13.1
Red Hat Red Hat Enterprise Linux 8 see references
Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support see references
Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support see references
Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support see references
Red Hat Red Hat Enterprise Linux 8.6 Telecommunications Update Service see references
Red Hat Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions see references
Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service see references
Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions see references
Red Hat Red Hat Enterprise Linux 9 see references
Red Hat Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions see references
Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions see references
Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support see references
Red Hat Red Hat Enterprise Linux 10 see references
Red Hat Red Hat Enterprise Linux 7 see references

Weakness: CWE-248 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References