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CVE-2025-3891· NVD / CVE Program· CNA redhat

Mod_auth_openidc: dos via empty post in mod_auth_openidc with oidcpreservepost enabled

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.

HighCVSS 7.5 · v3.1—No exploit Fix available
Published
Apr 29, 2025
Updated
Jun 29, 2026
EPSS
1.6% · 74th percentile
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Report tools

JSON

Action score

30

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 1.6%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · redhat
7.5
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Affected systems

VendorProduct
apachehttp server
redhatenterprise linux
debiandebian linux

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Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • apache http serverall versions

Versions reported by the vendor

Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.

  • github.com/OpenIDC/mod_auth_openidc mod_auth_openidc

    • 2.0.0 and later · before 2.4.13.1affected · semver

  • Red Hat Red Hat Enterprise Linux 10

    • all versionsaffected

  • Red Hat Red Hat Enterprise Linux 7

    • all versionsunknown

  • Red Hat Red Hat Enterprise Linux 8

    • 8100020250426100353.489197e6 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support

    • 8020020250612174445.4cda2c84 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support

    • 8040020250618101351.522a0ee4 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support

    • 8060020250617090503.ad008a3a and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 8.6 Telecommunications Update Service

    • 8060020250617090503.ad008a3a and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions

    • 8060020250617090503.ad008a3a and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service

    • 8080020250617090716.63b34585 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions

    • 8080020250617090716.63b34585 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 9

    • 0:2.4.10-1.el9_6.2 and laternot affected · rpm

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:8cjosebefore 0.6.1-4.module_el8.9.0+3631+0ced13d70.6.1-4.module_el8.9.0+3631+0ced13d7
AlmaLinux:8cjosebefore 0.6.1-4.module_el8.10.0+3881+234adf820.6.1-4.module_el8.10.0+3881+234adf82
AlmaLinux:8cjose-develbefore 0.6.1-4.module_el8.10.0+3881+234adf820.6.1-4.module_el8.10.0+3881+234adf82
AlmaLinux:8cjose-develbefore 0.6.1-4.module_el8.9.0+3631+0ced13d70.6.1-4.module_el8.9.0+3631+0ced13d7
AlmaLinux:8mod_auth_openidcbefore 2.4.9.4-8.module_el8.10.0+3988+526f02752.4.9.4-8.module_el8.10.0+3988+526f0275
AlmaLinux:9mod_auth_openidcbefore 2.4.10-1.el9_6.22.4.10-1.el9_6.2
Debian:11libapache2-mod-auth-openidcbefore 2.4.9.4-0+deb11u62.4.9.4-0+deb11u6
Debian:12libapache2-mod-auth-openidcbefore 2.4.12.3-2+deb12u42.4.12.3-2+deb12u4
Debian:13libapache2-mod-auth-openidcbefore 2.4.14.2-12.4.14.2-1
Red Hat:enterprise_linux:8::appstreamcjosebefore 0:0.6.1-4.module+el8.10.0+21813+b5444eb80:0.6.1-4.module+el8.10.0+21813+b5444eb8
Red Hat:enterprise_linux:8::appstreamcjose-debuginfobefore 0:0.6.1-4.module+el8.10.0+21813+b5444eb80:0.6.1-4.module+el8.10.0+21813+b5444eb8
Red Hat:enterprise_linux:8::appstreamcjose-debugsourcebefore 0:0.6.1-4.module+el8.10.0+21813+b5444eb80:0.6.1-4.module+el8.10.0+21813+b5444eb8
Red Hat:enterprise_linux:8::appstreamcjose-develbefore 0:0.6.1-4.module+el8.10.0+21813+b5444eb80:0.6.1-4.module+el8.10.0+21813+b5444eb8
Red Hat:enterprise_linux:8::appstreammod_auth_openidcbefore 0:2.4.9.4-8.module+el8.10.0+23056+decb09b10:2.4.9.4-8.module+el8.10.0+23056+decb09b1
Red Hat:enterprise_linux:8::appstreammod_auth_openidc-debuginfobefore 0:2.4.9.4-8.module+el8.10.0+23056+decb09b10:2.4.9.4-8.module+el8.10.0+23056+decb09b1
Red Hat:enterprise_linux:8::appstreammod_auth_openidc-debugsourcebefore 0:2.4.9.4-8.module+el8.10.0+23056+decb09b10:2.4.9.4-8.module+el8.10.0+23056+decb09b1
Red Hat:enterprise_linux:9::appstreammod_auth_openidcbefore 0:2.4.10-1.el9_6.20:2.4.10-1.el9_6.2
Red Hat:enterprise_linux:9::appstreammod_auth_openidc-debuginfobefore 0:2.4.10-1.el9_6.20:2.4.10-1.el9_6.2
Red Hat:enterprise_linux:9::appstreammod_auth_openidc-debugsourcebefore 0:2.4.10-1.el9_6.20:2.4.10-1.el9_6.2
Red Hat:rhel_aus:8.2::appstreamcjosebefore 0:0.6.1-3.module+el8.2.0+19461+3a40b6ee0:0.6.1-3.module+el8.2.0+19461+3a40b6ee
Red Hat:rhel_aus:8.2::appstreamcjose-debuginfobefore 0:0.6.1-3.module+el8.2.0+19461+3a40b6ee0:0.6.1-3.module+el8.2.0+19461+3a40b6ee
Red Hat:rhel_aus:8.2::appstreamcjose-debugsourcebefore 0:0.6.1-3.module+el8.2.0+19461+3a40b6ee0:0.6.1-3.module+el8.2.0+19461+3a40b6ee
Red Hat:rhel_aus:8.2::appstreamcjose-develbefore 0:0.6.1-3.module+el8.2.0+19461+3a40b6ee0:0.6.1-3.module+el8.2.0+19461+3a40b6ee
Red Hat:rhel_aus:8.2::appstreammod_auth_openidcbefore 0:2.4.9.4-2.module+el8.2.0+23265+3c1fe64f0:2.4.9.4-2.module+el8.2.0+23265+3c1fe64f

+41

Same product

apache: all records

Other highest-scoring records for the same primary product.

  • CVE-2021-42013Path Traversal and Remote Code Execution in Apache HTTP Server 2.4.49 and 2.4.50 (incomplete fix of CVE-2021-41773)KEV
    99Now
  • CVE-2021-41773Path traversal and file disclosure vulnerability in Apache HTTP Server 2.4.49KEV
    99Now
  • CVE-2024-38475Apache HTTP Server weakness in mod_rewrite when first segment of substitution matches filesystem path.KEV
    96Now
  • CVE-2019-0211In Apache HTTP Server 2.4 releases 2.4.17 to 2.4.38, with MPM event, worker or prefork, code executing in less-privileged child processes orKEV
    81Now
  • CVE-2021-44790Possible buffer overflow when parsing multipart content in mod_lua of Apache HTTP Server 2.4.51 and earlier
    68This week
  • CVE-2010-0425modules/arch/win32/mod_isapi.c in mod_isapi in the Apache HTTP Server 2.0.37 through 2.0.63, 2.2.0 through 2.2.14, and 2.3.x before 2.3.7, w
    68This week

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
github.com/OpenIDC/mod_auth_openidc mod_auth_openidc2.4.13.1Vendor (CNA)
almalinux:cjose0.6.1-4.module_el8.9.0+3631+0ced13d7 · AlmaLinux:8Package registry (OSV)
almalinux:cjose-devel0.6.1-4.module_el8.9.0+3631+0ced13d7 · AlmaLinux:8Package registry (OSV)
almalinux:mod_auth_openidc2.4.9.4-8.module_el8.10.0+3988+526f0275 · AlmaLinux:8Package registry (OSV)
debian:libapache2-mod-auth-openidc2.4.12.3-2+deb12u4 · Debian:12Package registry (OSV)
opensuse:apache2-mod_auth_openidc2.3.8-150600.16.11.1 · openSUSE:Leap 15.6Package registry (OSV)
red hat:cjose0:0.6.1-3.module+el8.6.0+19463+7d2e1f9c · Red Hat:rhel_aus:8.6::appstreamPackage registry (OSV)
red hat:cjose-debuginfo0:0.6.1-3.module+el8.6.0+19463+7d2e1f9c · Red Hat:rhel_aus:8.6::appstreamPackage registry (OSV)
red hat:cjose-debugsource0:0.6.1-3.module+el8.6.0+19463+7d2e1f9c · Red Hat:rhel_aus:8.6::appstreamPackage registry (OSV)
red hat:cjose-devel0:0.6.1-3.module+el8.6.0+19463+7d2e1f9c · Red Hat:rhel_aus:8.6::appstreamPackage registry (OSV)
red hat:mod_auth_openidc0:2.4.9.4-1.el9_0.3 · Red Hat:rhel_e4s:9.0::appstreamPackage registry (OSV)
red hat:mod_auth_openidc-debuginfo0:2.4.9.4-1.el9_0.3 · Red Hat:rhel_e4s:9.0::appstreamPackage registry (OSV)
red hat:mod_auth_openidc-debugsource0:2.4.9.4-1.el9_0.3 · Red Hat:rhel_e4s:9.0::appstreamPackage registry (OSV)
rocky linux:cjose0:0.6.1-4.module+el8.9.0+1384+4b58c166 · Rocky Linux:8Package registry (OSV)
rocky linux:mod_auth_openidc0:2.4.9.4-8.module+el8.10.0+1976+99abe5eb · Rocky Linux:8Package registry (OSV)
suse:apache2-mod_auth_openidc2.3.8-150600.16.11.1 · SUSE:Linux Enterprise Module for Server Applications 15 SP6Package registry (OSV)
suse:apache2-mod_auth_openidc2.4.0-7.22.1 · SUSE:Linux Enterprise Server 12 SP5-LTSSPackage registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-248 · Uncaught Exception

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

We use this product, ask for help

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records