CVE-2025-12543 Java — Exploit & Vulnerability Details CRITICAL

Parameter	Value
CVSS	9.6 (CRITICAL)
Affected Versions	2.3.0 — 8.1.3
Fixed In	4.14.4
Type	CWE-20 (Improper Input Validation)
Vendor	Java
Public PoC	No

A flaw was found in the Undertow HTTP server core, which is used in WildFly, JBoss EAP, and other Java applications. The Undertow library fails to properly validate the Host header in incoming HTTP requests.As a result, requests containing malformed or malicious Host headers are processed without rejection, enabling attackers to poison caches, perform internal network scans, or hijack user sessions.

Attack Parameters

Attack Vector

Network

Can be exploited remotely

Attack Complexity

Low

Easy to exploit

Privileges Required

None

No privileges needed

User Interaction

Required

User action required

Impact Assessment

Confidentiality

High

Complete data leak

Integrity

High

Complete data modification

Availability

High

Complete denial of service

CVSS Vector v3.1

Weakness Type (CWE)

CWE-20 Improper Input Validation

Vulnerable Products 12

Configuration	From (including)	Up to (excluding)
Redhat Build_Of_Apache_Camel cpe:2.3:a:redhat:build_of_apache_camel::::::spring_boot::*	—	`4.14.4`
Redhat Data_Grid cpe:2.3:a:redhat:data_grid:8.0:::::::*	—	—
Redhat Fuse cpe:2.3:a:redhat:fuse:7.0.0:::::::*	—	—
Redhat Jboss_Enterprise_Application_Platform cpe:2.3:a:redhat:jboss_enterprise_application_platform::::::::	`8.0`	`8.0.12`
Redhat Jboss_Enterprise_Application_Platform cpe:2.3:a:redhat:jboss_enterprise_application_platform::::::::	`8.1.0`	`8.1.3`
Redhat Jboss_Enterprise_Application_Platform cpe:2.3:a:redhat:jboss_enterprise_application_platform:-::::text-only:::	—	—
Redhat Jboss_Enterprise_Application_Platform cpe:2.3:a:redhat:jboss_enterprise_application_platform:7.0.0:::::::*	—	—
Redhat Jboss_Enterprise_Application_Platform_Expansion_Pack cpe:2.3:a:redhat:jboss_enterprise_application_platform_expansion_pack:-:::::::*	—	—
Redhat Process_Automation cpe:2.3:a:redhat:process_automation:7.0:::::::*	—	—
Redhat Single_Sign-On cpe:2.3:a:redhat:single_sign-on:7.0:::::::*	—	—
Redhat Undertow cpe:2.3:a:redhat:undertow::::::::	—	`2.2.39`
Redhat Undertow cpe:2.3:a:redhat:undertow::::::::	`2.3.0`	`2.3.21`