Home Embedded Vulns General Vulns

CVE-2025-12543

CRITICAL 9.6

Our Analysis: General-Purpose

Our model has classified this vulnerability as relevant to General-Purpose Systems, helping your team prioritize efforts effectively.

Published Date January 7, 2026
Last Modified January 8, 2026
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:L

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.