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 10
Red Hat Enterprise Linux 7
Red Hat Enterprise Linux 9
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

References

https://access.redhat.com/errata/RHSA-2025:4597
vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2025-3891
vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2361633
issue-trackingx_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

.
The Cyber Security Vulnerability Database.