CVE-2025-12543
CRITICAL EPSS 63.8%
Published Jan 7, 20265mo ago · Modified Jun 17, 20261w ago
9.6 CVSS 3.1
Published Jan 7, 2026 5mo ago
Last Modified Jun 17, 2026 1w ago
Description
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.
CVSS Details
Base Score
Exploitability
Impact
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction Required
Scope Changed
Confidentiality High
Integrity High
Availability High
Threat Intelligence
EPSS Exploit Probability
63.8% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available
Weaknesses 1
CWE-20 Improper Input Validation Validation
Affected Products 12
| Vendor | Product | Version | Range |
|---|---|---|---|
| redhat | build_of_apache_camel | * | <4.14.4 |
| redhat | data_grid | 8.0 | any |
| redhat | fuse | 7.0.0 | any |
| redhat | jboss_enterprise_application_platform | * | ≥8.0 – <8.0.12 |
| redhat | jboss_enterprise_application_platform | * | ≥8.1.0 – <8.1.3 |
| redhat | jboss_enterprise_application_platform | * | any |
| redhat | jboss_enterprise_application_platform | 7.0.0 | any |
| redhat | jboss_enterprise_application_platform_expansion_pack | * | any |
| redhat | process_automation | 7.0 | any |
| redhat | single_sign-on | 7.0 | any |
| redhat | undertow | * | <2.2.39 |
| redhat | undertow | * | ≥2.3.0 – <2.3.21 |
References 13
- access.redhat.com https://access.redhat.com/errata/RHSA-2026:0383
- access.redhat.com https://access.redhat.com/errata/RHSA-2026:0384
- access.redhat.com https://access.redhat.com/errata/RHSA-2026:0386
- access.redhat.com https://access.redhat.com/errata/RHSA-2026:3889
- access.redhat.com https://access.redhat.com/errata/RHSA-2026:3890
- access.redhat.com https://access.redhat.com/errata/RHSA-2026:3891
- access.redhat.com https://access.redhat.com/errata/RHSA-2026:3892
- access.redhat.com https://access.redhat.com/errata/RHSA-2026:4915
- access.redhat.com https://access.redhat.com/errata/RHSA-2026:4916
- access.redhat.com https://access.redhat.com/errata/RHSA-2026:4917
- access.redhat.com https://access.redhat.com/errata/RHSA-2026:4924
- access.redhat.com https://access.redhat.com/security/cve/CVE-2025-12543
- bugzilla.redhat.com https://bugzilla.redhat.com/show_bug.cgi?id=2408784
Remediation
No remediation data recorded yet
Check vendor advisories and the NVD entry for patch availability.