CVE-2025-12543 Undertow-core: undertow http server fails to reject malformed host headers leading to potential cache poisoning and ssrf
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.
Problem types: cwe_id: CWE-20
description: Improper Input Validation
Affected products: vendor: Red Hat
product: Red Hat build of Apache Camel 4.14.4 for Spring Boot 3.5.11
cpes: cpe:/a:redhat:apache_camel_spring_boot:4.14
default_status: unaffected
vendor: Red Hat
product: Red Hat JBoss Enterprise Application Platform
cpes: cpe:/a:redhat:jboss_enterprise_application_platform:7.4
default_status: affected
vendor: Red Hat
product: Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7
cpes: cpe:/a:redhat:jboss_enterprise_application_platform_els:7.4::el7
default_status: affected
vendor: Red Hat
product: Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7
cpes: cpe:/a:redhat:jboss_enterprise_application_platform_els:7.4::el7
default_status: affected
vendor: Red Hat
product: Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8
cpes: cpe:/a:redhat:jboss_enterprise_application_platform_els:7.4::el8
default_status: affected
vendor: Red Hat
product: Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8
cpes: cpe:/a:redhat:jboss_enterprise_application_platform_els:7.4::el8
default_status: affected
vendor: Red Hat
product: Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 9
cpes: cpe:/a:redhat:jboss_enterprise_application_platform_els:7.4::el9
default_status: affected
vendor: Red Hat
product: Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 9
cpes: cpe:/a:redhat:jboss_enterprise_application_platform_els:7.4::el9
default_status: affected
vendor: Red Hat
product: Red Hat JBoss Enterprise Application Platform 8.0
cpes: cpe:/a:redhat:jboss_enterprise_application_platform:8.0::el8
default_status: unaffected
vendor: Red Hat
product: Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8
cpes: cpe:/a:redhat:jboss_enterprise_application_platform:8.0::el8
default_status: affected
vendor: Red Hat
product: Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8
cpes: cpe:/a:redhat:jboss_enterprise_application_platform:8.0::el8
default_status: affected
vendor: Red Hat
product: Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8
cpes: cpe:/a:redhat:jboss_enterprise_application_platform:8.0::el8
default_status: affected
vendor: Red Hat
product: Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8
cpes: cpe:/a:redhat:jboss_enterprise_application_platform:8.0::el8
default_status: affected
vendor: Red Hat
product: Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8
cpes: cpe:/a:redhat:jboss_enterprise_application_platform:8.0::el8
default_status: affected
vendor: Red Hat
product: Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8
cpes: cpe:/a:redhat:jboss_enterprise_application_platform:8.0::el8
default_status: affected
vendor: Red Hat
product: Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9
cpes: cpe:/a:redhat:jboss_enterprise_application_platform:8.0::el9
default_status: affected
vendor: Red Hat
product: Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9
cpes: cpe:/a:redhat:jboss_enterprise_application_platform:8.0::el9
default_status: affected
vendor: Red Hat
product: Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9
cpes: cpe:/a:redhat:jboss_enterprise_application_platform:8.0::el9
default_status: affected
vendor: Red Hat
product: Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9
cpes: cpe:/a:redhat:jboss_enterprise_application_platform:8.0::el9
default_status: affected
vendor: Red Hat
product: Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9
cpes: cpe:/a:redhat:jboss_enterprise_application_platform:8.0::el9
default_status: affected
vendor: Red Hat
product: Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9
cpes: cpe:/a:redhat:jboss_enterprise_application_platform:8.0::el9
default_status: affected
vendor: Red Hat
product: Red Hat JBoss Enterprise Application Platform 8.1
cpes: cpe:/a:redhat:jboss_enterprise_application_platform:8.0::el8
default_status: unaffected
vendor: Red Hat
product: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
cpes: cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el8
default_status: affected
vendor: Red Hat
product: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
cpes: cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el8
default_status: affected
vendor: Red Hat
product: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
cpes: cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el8
default_status: affected
vendor: Red Hat
product: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
cpes: cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el8
default_status: affected
vendor: Red Hat
product: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
cpes: cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el8
default_status: affected
vendor: Red Hat
product: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
cpes: cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el8
default_status: affected
vendor: Red Hat
product: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
cpes: cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el8
default_status: affected
vendor: Red Hat
product: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
cpes: cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el8
default_status: affected
vendor: Red Hat
product: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
cpes: cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el8
default_status: affected
vendor: Red Hat
product: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
cpes: cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el8
default_status: affected
vendor: Red Hat
product: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
cpes: cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el8
default_status: affected
vendor: Red Hat
product: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
cpes: cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el8
default_status: affected
vendor: Red Hat
product: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
cpes: cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el9
default_status: affected
vendor: Red Hat
product: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
cpes: cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el9
default_status: affected
vendor: Red Hat
product: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
cpes: cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el9
default_status: affected
vendor: Red Hat
product: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
cpes: cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el9
default_status: affected
vendor: Red Hat
product: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
cpes: cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el9
default_status: affected
vendor: Red Hat
product: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
cpes: cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el9
default_status: affected
vendor: Red Hat
product: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
cpes: cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el9
default_status: affected
vendor: Red Hat
product: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
cpes: cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el9
default_status: affected
vendor: Red Hat
product: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
cpes: cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el9
default_status: affected
vendor: Red Hat
product: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
cpes: cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el9
default_status: affected
vendor: Red Hat
product: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
cpes: cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el9
default_status: affected
vendor: Red Hat
product: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
cpes: cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el9
default_status: affected
vendor: Red Hat
product: Red Hat build of Apache Camel - HawtIO 4
cpes: cpe:/a:redhat:apache_camel_hawtio:4
default_status: unaffected
vendor: Red Hat
product: Red Hat Data Grid 8
cpes: cpe:/a:redhat:jboss_data_grid:8
default_status: affected
vendor: Red Hat
product: Red Hat Enterprise Linux 10
cpes: cpe:/o:redhat:enterprise_linux:10
default_status: unaffected
vendor: Red Hat
product: Red Hat Enterprise Linux 8
cpes: cpe:/o:redhat:enterprise_linux:8
default_status: unaffected
vendor: Red Hat
product: Red Hat Enterprise Linux 8
cpes: cpe:/o:redhat:enterprise_linux:8
default_status: unaffected
vendor: Red Hat
product: Red Hat Enterprise Linux 9
cpes: cpe:/o:redhat:enterprise_linux:9
default_status: unaffected
vendor: Red Hat
product: Red Hat Fuse 7
cpes: cpe:/a:redhat:jboss_fuse:7
default_status: affected
vendor: Red Hat
product: Red Hat JBoss Enterprise Application Platform 7
cpes: cpe:/a:redhat:jboss_enterprise_application_platform:7
default_status: affected
vendor: Red Hat
product: Red Hat JBoss Enterprise Application Platform Expansion Pack
cpes: cpe:/a:redhat:jbosseapxp
default_status: affected
vendor: Red Hat
product: Red Hat Process Automation 7
cpes: cpe:/a:redhat:jboss_enterprise_bpms_platform:7
default_status: affected
vendor: Red Hat
product: Red Hat Single Sign-On 7
cpes: cpe:/a:redhat:red_hat_single_sign_on:7
default_status: affected
CVSS v3.1: attackComplexity: LOW
attackVector: NETWORK
availabilityImpact: LOW
baseScore: 9.6
baseSeverity: CRITICAL
confidentialityImpact: HIGH
integrityImpact: HIGH
privilegesRequired: NONE
scope: CHANGED
userInteraction: REQUIRED
vectorString: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:L
version: 3.1
Credits: lang: en
value: Red Hat would like to thank Ahmet Artuç for reporting this issue.
Published: 2026-01-07T16:04:22.155Z