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CVE-2025-12543 is a critical improper input validation flaw in the Undertow HTTP server core used by WildFly, JBoss EAP, and other Java applications. Undertow fails to properly validate the HTTP Host header in incoming requests, allowing malformed or attacker-controlled Host values to be accepted and processed instead of rejected. Because Host is commonly used by applications, reverse proxies, and caches for routing, link generation, and cache key decisions, this weakness can be abused for Host header injection attacks. Reported consequences include cache poisoning, server-side request forgery style access to internal services, internal network reconnaissance, and session hijacking or credential theft scenarios where attacker-controlled host values influence generated links or application behavior.
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Patch, then assume compromise.
No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
23 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A critical vulnerability patched in Oracle Communications that can lead to remote code execution.
A vulnerability in Undertow HTTP Server where malformed Host headers are not properly rejected, potentially leading to cache poisoning and SSRF.
Unknown (listed as a trending CVE affecting HPE Telco Service Activator).
Unknown (listed as a trending CVE affecting HPE Telco Service Activator; no technical details provided in the content).
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.