Mod_auth_openidc: dos via empty post in mod_auth_openidc with oidcpreservepost enabled
Priority MEDIUM 42CWE-248Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Partial Red Hat: 12 fixed, 1 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-248.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.01604 75th percentileScored 2026-11-07
Fix Partial mod_auth_openidc: 2.4.13.1Red Hat: 9 advisoriesRed Hat: 12 fixed, 1 without a fix
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | mod_auth_openidc | 2.0.0 to before 2.4.13.1 | 2.4.13.1 | Patch available | CNA |
| Red Hat | Red Hat Enterprise Linux 8 | — | 8100020250426100353.489197e6 | Patch available | CNA |
| Red Hat | Red Hat Enterprise Linux 8.2 Advanced Update Support | — | 8020020250612174445.4cda2c84 | Patch available | CNA |
| Red Hat | Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support | — | 8040020250618101351.522a0ee4 | Patch available | CNA |
| Red Hat | Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support | — | 8060020250617090503.ad008a3a | Patch available | CNA |
| Red Hat | Red Hat Enterprise Linux 8.6 Telecommunications Update Service | — | 8060020250617090503.ad008a3a | Patch available | CNA |
| Red Hat | Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions | — | 8060020250617090503.ad008a3a | Patch available | CNA |
| Red Hat | Red Hat Enterprise Linux 8.8 Telecommunications Update Service | — | 8080020250617090716.63b34585 | Patch available | CNA |
| Red Hat | Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions | — | 8080020250617090716.63b34585 | Patch available | CNA |
| Red Hat | Red Hat Enterprise Linux 9 | — | 2.4.10-1.el9_6.2 | Patch available | CNA |
| Red Hat | Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions | — | 2.4.9.4-1.el9_0.3 | Patch available | CNA |
| Red Hat | Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions | — | 2.4.9.4-1.el9_2.3 | Patch available | CNA |
| Red Hat | Red Hat Enterprise Linux 9.4 Extended Update Support | — | 2.4.9.4-4.el9_4.2 | Patch available | CNA |
| Red Hat | Red Hat Enterprise Linux 10 | — | — | No fix listed | CNA |
| Red Hat | Red Hat Enterprise Linux 7 | — | — | Not affected | CNA |
- mod_auth_openidc Vendor— Affected 2.0.0 to before 2.4.13.1 Fixed in 2.4.13.1 Patch available CNA
- Red Hat Enterprise Linux 8 VendorRed Hat Affected — Fixed in 8100020250426100353.489197e6 Patch available CNA
- Red Hat Enterprise Linux 8.2 Advanced Update Support VendorRed Hat Affected — Fixed in 8020020250612174445.4cda2c84 Patch available CNA
- Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support VendorRed Hat Affected — Fixed in 8040020250618101351.522a0ee4 Patch available CNA
- Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support VendorRed Hat Affected — Fixed in 8060020250617090503.ad008a3a Patch available CNA
- Red Hat Enterprise Linux 8.6 Telecommunications Update Service VendorRed Hat Affected — Fixed in 8060020250617090503.ad008a3a Patch available CNA
- Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions VendorRed Hat Affected — Fixed in 8060020250617090503.ad008a3a Patch available CNA
- Red Hat Enterprise Linux 8.8 Telecommunications Update Service VendorRed Hat Affected — Fixed in 8080020250617090716.63b34585 Patch available CNA
- Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions VendorRed Hat Affected — Fixed in 8080020250617090716.63b34585 Patch available CNA
- Red Hat Enterprise Linux 9 VendorRed Hat Affected — Fixed in 2.4.10-1.el9_6.2 Patch available CNA
- Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions VendorRed Hat Affected — Fixed in 2.4.9.4-1.el9_0.3 Patch available CNA
- Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions VendorRed Hat Affected — Fixed in 2.4.9.4-1.el9_2.3 Patch available CNA
- Red Hat Enterprise Linux 9.4 Extended Update Support VendorRed Hat Affected — Fixed in 2.4.9.4-4.el9_4.2 Patch available CNA
- Red Hat Enterprise Linux 10 VendorRed Hat Affected — Fixed in — No fix listed CNA
- Red Hat Enterprise Linux 7 VendorRed Hat Affected — Fixed in — Not affected CNA
CPE configurations NVD · 5
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:apache:http_server:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | Apache |
| cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:* | 7.0 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:-:*:*:* | 8.0 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:* | 9.0 | Vulnerable | Red Hat |
| cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* | 11.0 | Vulnerable | Debian |
- cpe:2.3:a:apache:http_server:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Apache
- cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:* Versions 7.0 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:-:*:*:* Versions 8.0 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Red Hat
- cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* Versions 11.0 Vulnerable ·Debian
Remediation
- Fix · CNA mod_auth_openidc Fixed in 2.4.13.1
Red Hat 9 advisories
- RHSA-2025:10007 Released 2025-07-01 · Red Hat rating Importantmod_auth_openidc security update
- Red Hat Enterprise Linux AppStream EUS (v.9.4) mod_auth_openidc-2.4.9.4-4.el9_4.2
- RHSA-2025:10010 Released 2025-07-01 · Red Hat rating Importantmod_auth_openidc:2.3 security update
- Red Hat Enterprise Linux AppStream E4S (v.8.8) cjose-0.6.1-3.module+el8.8.0+19464+578f4546.ppc64le::mod_auth_openidc:2.3, cjose-0.6.1-3.module+el8.8.0+19464+578f4546.src::mod_auth_openidc:2.3, cjose-0.6.1-3.module+el8.8.0+19464+578f4546.x86_64::mod_auth_openidc:2.3 +5
- Red Hat Enterprise Linux AppStream TUS (v.8.8) cjose-0.6.1-3.module+el8.8.0+19464+578f4546.src::mod_auth_openidc:2.3, cjose-0.6.1-3.module+el8.8.0+19464+578f4546.x86_64::mod_auth_openidc:2.3, cjose-devel-0.6.1-3.module+el8.8.0+19464+578f4546.x86_64::mod_auth_openidc:2.3 +2
- RHSA-2025:10003 Released 2025-07-01 · Red Hat rating Importantmod_auth_openidc:2.3 security update
- Red Hat Enterprise Linux AppStream AUS (v.8.6) cjose-0.6.1-3.module+el8.6.0+19463+7d2e1f9c.src::mod_auth_openidc:2.3, cjose-0.6.1-3.module+el8.6.0+19463+7d2e1f9c.x86_64::mod_auth_openidc:2.3, cjose-devel-0.6.1-3.module+el8.6.0+19463+7d2e1f9c.x86_64::mod_auth_openidc:2.3 +2
- Red Hat Enterprise Linux AppStream E4S (v.8.6) cjose-0.6.1-3.module+el8.6.0+19463+7d2e1f9c.aarch64::mod_auth_openidc:2.3, cjose-0.6.1-3.module+el8.6.0+19463+7d2e1f9c.ppc64le::mod_auth_openidc:2.3, cjose-0.6.1-3.module+el8.6.0+19463+7d2e1f9c.s390x::mod_auth_openidc:2.3 +11
- Red Hat Enterprise Linux AppStream TUS (v.8.6) cjose-0.6.1-3.module+el8.6.0+19463+7d2e1f9c.src::mod_auth_openidc:2.3, cjose-0.6.1-3.module+el8.6.0+19463+7d2e1f9c.x86_64::mod_auth_openidc:2.3, cjose-devel-0.6.1-3.module+el8.6.0+19463+7d2e1f9c.x86_64::mod_auth_openidc:2.3 +2
Show 6 more Red Hat advisories
- RHSA-2025:10004 Released 2025-07-01 · Red Hat rating Importantmod_auth_openidc:2.3 security update
- Red Hat Enterprise Linux AppStream AUS (v.8.4) cjose-0.6.1-3.module+el8.4.0+19462+14bde120.src::mod_auth_openidc:2.3, cjose-0.6.1-3.module+el8.4.0+19462+14bde120.x86_64::mod_auth_openidc:2.3, cjose-devel-0.6.1-3.module+el8.4.0+19462+14bde120.x86_64::mod_auth_openidc:2.3 +2
- RHSA-2025:10008 Released 2025-07-01 · Red Hat rating Importantmod_auth_openidc security update
- Red Hat Enterprise Linux AppStream E4S (v.9.2) mod_auth_openidc-2.4.9.4-1.el9_2.3
- RHSA-2025:10006 Released 2025-07-01 · Red Hat rating Importantmod_auth_openidc:2.3 security update
- Red Hat Enterprise Linux AppStream AUS (v. 8.2) cjose-0.6.1-3.module+el8.2.0+19461+3a40b6ee.src::mod_auth_openidc:2.3, cjose-0.6.1-3.module+el8.2.0+19461+3a40b6ee.x86_64::mod_auth_openidc:2.3, cjose-devel-0.6.1-3.module+el8.2.0+19461+3a40b6ee.x86_64::mod_auth_openidc:2.3 +2
- RHSA-2025:10002 Released 2025-07-01 · Red Hat rating Importantmod_auth_openidc security update
- Red Hat Enterprise Linux AppStream E4S (v.9.0) mod_auth_openidc-2.4.9.4-1.el9_0.3
- RHSA-2025:9396 Released 2025-06-23 · Red Hat rating Importantmod_auth_openidc security update
- Red Hat Enterprise Linux AppStream (v. 9) mod_auth_openidc-2.4.10-1.el9_6.2
- RHSA-2025:4597 Released 2025-05-06 · Red Hat rating Moderatemod_auth_openidc:2.3 security update
- Red Hat Enterprise Linux AppStream (v. 8) cjose-0.6.1-4.module+el8.10.0+21813+b5444eb8.aarch64::mod_auth_openidc:2.3, cjose-0.6.1-4.module+el8.10.0+21813+b5444eb8.ppc64le::mod_auth_openidc:2.3, cjose-0.6.1-4.module+el8.10.0+21813+b5444eb8.s390x::mod_auth_openidc:2.3 +11
Vendor assessments
Red Hat
Red Hat rating: Important. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 10 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux AppStream (v. 8) | Fixed | RHSA-2025:4597 |
| Red Hat Enterprise Linux AppStream (v. 9) | Fixed | RHSA-2025:9396 |
| Red Hat Enterprise Linux AppStream AUS (v. 8.2) | Fixed | RHSA-2025:10006 |
| Red Hat Enterprise Linux AppStream AUS (v.8.4) | Fixed | RHSA-2025:10004 |
| Red Hat Enterprise Linux AppStream AUS (v.8.6) | Fixed | RHSA-2025:10003 |
| Red Hat Enterprise Linux AppStream E4S (v.8.6) | Fixed | RHSA-2025:10003 |
| Red Hat Enterprise Linux AppStream E4S (v.8.8) | Fixed | RHSA-2025:10010 |
| Red Hat Enterprise Linux AppStream E4S (v.9.0) | Fixed | RHSA-2025:10002 |
| Red Hat Enterprise Linux AppStream E4S (v.9.2) | Fixed | RHSA-2025:10008 |
| Red Hat Enterprise Linux AppStream EUS (v.9.4) | Fixed | RHSA-2025:10007 |
| Red Hat Enterprise Linux AppStream TUS (v.8.6) | Fixed | RHSA-2025:10003 |
| Red Hat Enterprise Linux AppStream TUS (v.8.8) | Fixed | RHSA-2025:10010 |
Not affected: 1 product
- Red Hat Enterprise Linux 7
Timeline
- 2026-10-02 Threatist record created from CVE-2025-3891
- 2026-10-03 Alias added: GHSA-v96g-5j57-774c
References
Advisory 11
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Sources
- CVE-2025-3891 · CVE Program
- CVE-2025-3891 · NVD
- FIRST EPSS
- GHSA-v96g-5j57-774c · GitHub Advisory Database · CC BY 4.0
- CVE-2025-3891 · Red Hat security data · CC BY 4.0
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