Denial of Service Vulnerability in mod_auth_openidc for Apache HTTP Server
CVE-2025-3891

7.5HIGH

Key Information:

Vendor

Red Hat
Status
Red Hat Enterprise Linux 8
Red Hat Enterprise Linux 8.2 Advanced Update Support
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
Vendor
CVE Published:
29 April 2025

What is CVE-2025-3891?

A flaw has been identified in the mod_auth_openidc module for the Apache HTTP Server that permits a remote, unauthenticated attacker to induce a denial of service. This vulnerability arises when the OIDCPreservePost directive is enabled, allowing the attacker to send an empty POST request that causes the server to crash consistently, leading to significant availability issues.

Affected Version(s)

Red Hat Enterprise Linux 8 8100020250426100353.489197e6

Red Hat Enterprise Linux 8.2 Advanced Update Support 8020020250612174445.4cda2c84

Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support 8040020250618101351.522a0ee4

References

https://access.redhat.com/errata/RHSA-2025:10002
vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2025:10003
vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2025:10004
vendor-advisoryx_refsource_REDHAT

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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CVE-2025-3891 : Denial of Service Vulnerability in mod_auth_openidc for Apache HTTP Server