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THREAT OPS › Threat News › [NVD] CVE-2025-12543 (CRITICAL 9.6) — 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

[NVD] CVE-2025-12543 (CRITICAL 9.6) — 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

lownvdPublished 2026-01-07

CVE-2025-12543 CVSS: 9.6 CRITICAL Published: 2026-01-07T17:15:55.093

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

Indicators of compromise

CVE-2025-12543cve

Original source: https://nvd.nist.gov/vuln/detail/CVE-2025-12543