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CVE-2025-12543 is a critical severity vulnerability with a CVSS score of 9.6. Exploits are available; patches have been released and should be applied urgently.
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Lower probability of exploitation
EPSS predicts the probability of exploitation in the next 30 days based on real-world threat data, complementing CVSS severity scores with actual risk assessment.
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.
| Vendor | Product |
|---|---|
| Redhat | Jboss Enterprise Application Platform |
| Redhat | Fuse |
| Redhat | Undertow |
| Redhat | Process Automation |
| Redhat | Jboss Enterprise Application Platform Expansion Pack |
| Redhat | Build Of Apache Camel |
| Redhat | Data Grid |
| Redhat | Single Sign On |