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CVE-2025-3891— Mod_auth_openidc: dos via empty post in mod_auth_openidc with oidcpreservepost enabled

Quick assessment

Affected
CVE-2025-3891
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Red Hat Enterprise Linux 7是美国红帽（Red Hat）公司的一套面向企业用户的Linux操作系统。 Red Hat Enterprise Linux 7存在安全漏洞，该漏洞源于处理空POST请求时崩溃，可能导致拒绝服务。

CVSS 7.5 · High EPSS 1.42% · P71

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 15

VendorProduct Version RangeStatus
None None 2.0.0< 2.4.13.1 affected
Red Hat Red Hat Enterprise Linux 10 any affected
Red Hat Red Hat Enterprise Linux 7 any unaffected
Red Hat Red Hat Enterprise Linux 8 8100020250426100353.489197e6< * unaffected
Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support 8020020250612174445.4cda2c84< * unaffected
Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support 8040020250618101351.522a0ee4< * unaffected
Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support 8060020250617090503.ad008a3a< * unaffected
Red Hat Red Hat Enterprise Linux 8.6 Telecommunications Update Service 8060020250617090503.ad008a3a< * unaffected
Red Hat Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions 8060020250617090503.ad008a3a< * unaffected
Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service 8080020250617090716.63b34585< * unaffected
Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions 8080020250617090716.63b34585< * unaffected
Red Hat Red Hat Enterprise Linux 9 0:2.4.10-1.el9_6.2< * unaffected
Red Hat Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions 0:2.4.9.4-1.el9_0.3< * unaffected
Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions 0:2.4.9.4-1.el9_2.3< * unaffected
Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support 0:2.4.9.4-4.el9_4.2< * unaffected

I. Basic Information for CVE-2025-3891

Vulnerability Information
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Vulnerability Title
Mod_auth_openidc: dos via empty post in mod_auth_openidc with oidcpreservepost enabled
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未捕获的异常
Source: CVE Program / CVE List V5
Vulnerability Title
Red Hat Enterprise Linux 7 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Red Hat Enterprise Linux 7是美国红帽（Red Hat）公司的一套面向企业用户的Linux操作系统。 Red Hat Enterprise Linux 7存在安全漏洞，该漏洞源于处理空POST请求时崩溃，可能导致拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
- - 2.0.0 ~ 2.4.13.1 -
Red Hat Red Hat Enterprise Linux 8 8100020250426100353.489197e6 ~ * cpe:/a:redhat:enterprise_linux:8::appstream
Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support 8020020250612174445.4cda2c84 ~ * cpe:/a:redhat:rhel_aus:8.2::appstream
Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support 8040020250618101351.522a0ee4 ~ * cpe:/a:redhat:rhel_aus:8.4::appstream
Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support 8060020250617090503.ad008a3a ~ * cpe:/a:redhat:rhel_aus:8.6::appstream
Red Hat Red Hat Enterprise Linux 8.6 Telecommunications Update Service 8060020250617090503.ad008a3a ~ * cpe:/a:redhat:rhel_aus:8.6::appstream
Red Hat Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions 8060020250617090503.ad008a3a ~ * cpe:/a:redhat:rhel_aus:8.6::appstream
Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service 8080020250617090716.63b34585 ~ * cpe:/a:redhat:rhel_e4s:8.8::appstream
Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions 8080020250617090716.63b34585 ~ * cpe:/a:redhat:rhel_e4s:8.8::appstream
Red Hat Red Hat Enterprise Linux 9 0:2.4.10-1.el9_6.2 ~ * cpe:/a:redhat:enterprise_linux:9::appstream
Red Hat Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions 0:2.4.9.4-1.el9_0.3 ~ * cpe:/a:redhat:rhel_e4s:9.0::appstream
Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions 0:2.4.9.4-1.el9_2.3 ~ * cpe:/a:redhat:rhel_e4s:9.2::appstream
Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support 0:2.4.9.4-4.el9_4.2 ~ * cpe:/a:redhat:rhel_eus:9.4::appstream
Red Hat Red Hat Enterprise Linux 10 - cpe:/o:redhat:enterprise_linux:10
Red Hat Red Hat Enterprise Linux 7 - cpe:/o:redhat:enterprise_linux:7

II. Public POCs for CVE-2025-3891

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 8141 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2025-3891

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Vendor Advisories for CVE-2025-3891 (6)

IV. Related Vulnerabilities

Same weakness: CWE-248

V. Comments for CVE-2025-3891

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