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CVE-2025-12543

9.6 critical exploit SSVC exploitation: poc Modified
NVD · CVE.org

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.

Fix

Public exploits 1

Each line links to the index that lists it, never to exploit code. Exploit-DB's "verified" and a Metasploit rank of good or better count as verified; a PoC-in-GitHub entry is a repository's claim.

Patch, vendor advisory and mitigation references on NVD 18

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 1

  1. First seenCVSS 9.6 · redhatNVD modified 2026-10-14 17:17

Affected (CPE criteria) 10

  • cpe:2.3:a:redhat:build_of_apache_camel:*:*:*:*:*:spring_boot:*:*
  • cpe:2.3:a:redhat:data_grid:8.0:*:*:*:*:*:*:*
  • cpe:2.3:a:redhat:fuse:7.0.0:*:*:*:*:*:*:*
  • cpe:2.3:a:redhat:jboss_enterprise_application_platform:*:*:*:*:*:*:*:*
  • cpe:2.3:a:redhat:jboss_enterprise_application_platform:-:*:*:*:text-only:*:*:*
  • cpe:2.3:a:redhat:jboss_enterprise_application_platform:7.0.0:*:*:*:*:*:*:*
  • cpe:2.3:a:redhat:jboss_enterprise_application_platform_expansion_pack:-:*:*:*:*:*:*:*
  • cpe:2.3:a:redhat:process_automation:7.0:*:*:*:*:*:*:*
  • cpe:2.3:a:redhat:single_sign-on:7.0:*:*:*:*:*:*:*
  • cpe:2.3:a:redhat:undertow:*:*:*:*:*:*:*:*

References 36