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.

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploitation none

Automatable yes

Technical Impact partial

Affected Vendors & Products

Vendors Products
Apache
  • Http Server
Debian
  • Debian Linux
Redhat
  • Enterprise Linux
  • Rhel Aus
  • Rhel E4s
  • Rhel Eus
  • Rhel Tus

Configuration 1 [-]

cpe:2.3:a:apache:http_server:-:*:*:*:*:*:*:*

Configuration 2 [-]

OR cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:-:*:*:*
cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*

Configuration 3 [-]

cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*
Package CPE Advisory Released Date
Red Hat Enterprise Linux 8
mod_auth_openidc:2.3-8100020250426100353.489197e6 cpe:/a:redhat:enterprise_linux:8 RHSA-2025:4597 2025-05-06T00:00:00Z
Red Hat Enterprise Linux 9
mod_auth_openidc-0:2.4.10-1.el9_6.2 cpe:/a:redhat:enterprise_linux:9 RHSA-2025:9396 2025-06-23T00:00:00Z
References
Link Providers
https://access.redhat.com/errata/RHSA-2025:10002 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2025:10003 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2025:10004 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2025:10006 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2025:10007 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2025:10008 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2025:10010 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2025:4597 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2025:9396 cve-icon cve-icon
https://access.redhat.com/security/cve/CVE-2025-3891 cve-icon cve-icon
https://bugzilla.redhat.com/show_bug.cgi?id=2361633 cve-icon cve-icon
https://lists.debian.org/debian-lts-announce/2025/05/msg00007.html cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2025-3891 cve-icon
https://www.cve.org/CVERecord?id=CVE-2025-3891 cve-icon
History

Tue, 01 Jul 2025 02:00:00 +0000

Type Values Removed Values Added
First Time appeared Redhat rhel Aus
Redhat rhel E4s
Redhat rhel Eus
Redhat rhel Tus
CPEs cpe:/a:redhat:rhel_aus:8.2::appstream
cpe:/a:redhat:rhel_aus:8.4::appstream
cpe:/a:redhat:rhel_aus:8.6::appstream
cpe:/a:redhat:rhel_e4s:8.6::appstream
cpe:/a:redhat:rhel_e4s:8.8::appstream
cpe:/a:redhat:rhel_e4s:9.0::appstream
cpe:/a:redhat:rhel_e4s:9.2::appstream
cpe:/a:redhat:rhel_eus:9.4::appstream
cpe:/a:redhat:rhel_tus:8.6::appstream
cpe:/a:redhat:rhel_tus:8.8::appstream
Vendors & Products Redhat rhel Aus
Redhat rhel E4s
Redhat rhel Eus
Redhat rhel Tus
References

Tue, 24 Jun 2025 02:30:00 +0000

Type Values Removed Values Added
CPEs cpe:/a:redhat:enterprise_linux:9

Mon, 23 Jun 2025 18:45:00 +0000

Type Values Removed Values Added
CPEs cpe:/o:redhat:enterprise_linux:9 cpe:/a:redhat:enterprise_linux:9::appstream
References

Tue, 10 Jun 2025 19:00:00 +0000

Type Values Removed Values Added
Metrics threat_severity

Moderate

 threat_severity

Important

Fri, 06 Jun 2025 10:15:00 +0000

Type Values Removed Values Added
CPEs cpe:/o:redhat:enterprise_linux:10
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'}

 cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

Mon, 12 May 2025 20:00:00 +0000

Type Values Removed Values Added
First Time appeared Apache
Apache http Server
Debian
Debian debian Linux
Weaknesses NVD-CWE-noinfo
CPEs cpe:2.3:a:apache:http_server:-:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:-:*:*:*
cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*
Vendors & Products Apache
Apache http Server
Debian
Debian debian Linux

Thu, 08 May 2025 11:45:00 +0000

Type Values Removed Values Added
References

Wed, 07 May 2025 15:00:00 +0000

Type Values Removed Values Added
CPEs cpe:/a:redhat:enterprise_linux:8

Wed, 07 May 2025 02:30:00 +0000

Type Values Removed Values Added
CPEs cpe:/o:redhat:enterprise_linux:8 cpe:/a:redhat:enterprise_linux:8::appstream
References

Fri, 02 May 2025 02:45:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

 threat_severity

Moderate

Tue, 29 Apr 2025 14:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Tue, 29 Apr 2025 12:15:00 +0000

Type Values Removed Values Added
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.
Title Mod_auth_openidc: dos via empty post in mod_auth_openidc with oidcpreservepost enabled
First Time appeared Redhat
Redhat enterprise Linux
Weaknesses CWE-248
CPEs cpe:/o:redhat:enterprise_linux:7
cpe:/o:redhat:enterprise_linux:8
cpe:/o:redhat:enterprise_linux:9
Vendors & Products Redhat
Redhat enterprise Linux
References
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'}
cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2025-07-01T01:53:32.168Z

Reserved: 2025-04-23T06:53:53.124Z

Link: CVE-2025-3891

cve-icon Vulnrichment

Updated: 2025-05-08T11:02:57.903Z

cve-icon NVD

Status : Modified

Published: 2025-04-29T12:15:32.137

Modified: 2025-07-01T02:15:21.967

Link: CVE-2025-3891

cve-icon Redhat

Severity : Important

Publid Date: 2025-04-29T11:37:07Z

Links: CVE-2025-3891 - Bugzilla