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Verdict

CRITICAL SEVERITY (CVSS 9.6)

What is this: 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 pro… (CWE-20: Improper Input Validation) Affects Redhat Build Of Apache Camel.
Should you care: Rated critical severity — CVSS 9.6.
What to do: Patch when able.

INVESTIGATEMODERATE EVIDENCE COVERAGEDeterministic · stored evidence only

Vulnerability investigation

Critical technical impact; exploitation evidence is not established

The available snapshot does not list this vulnerability in CISA KEV; that is not proof exploitation has not occurred. NVD rates the technical severity critical at CVSS 9.6. These are public vulnerability signals, not proof that a specific environment runs an affected version.

Exploitation status

No KEV listing in available snapshot

Absence from KEV does not establish absence of exploitation.

30-day exploitation likelihood

Unavailable

FIRST EPSS did not return a score.

Technical severity

9.6 · critical

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:L

Affected surface

9 parsed products

Redhat Build Of Apache Camel, Redhat Data Grid 8.0, Redhat Fuse 7.0.0

Weakness class

CWE-20: Improper Input Validation

CWE describes the weakness category, not whether a deployed product is reachable or exploitable.

Corpus evidence

1 connectors · 16 citations

No related report text is available in the local corpus.

What the evidence supports

Findings stay bounded to named sources and observable infrastructure.

2 findings

CVSS 9.6 critical technical impact

HIGH

Network · Low · None · Required

NIST NVD CVSS

CVSS measures technical severity and prerequisites; it does not measure observed exploitation likelihood.

9 affected product mappings

MODERATE

Redhat Build Of Apache Camel, Redhat Data Grid 8.0, Redhat Fuse 7.0.0, Redhat Jboss Enterprise Application Platform, Redhat Jboss Enterprise Application Platform 7.0.0…

NVD CPE / CISA product metadata

Product names are candidate applicability pivots. Confirm exact deployed versions and vendor ranges before remediation decisions.

What remains unknown

Whether your environment runs an affected product and version is not established by this public lookup.
Reachability, compensating controls, and successful exploitation in a specific environment are not checked.
CISA KEV absence is a point-in-time catalog result, not evidence that exploitation has never occurred.
No locally ingested public report supplies exploit, actor, or campaign context for this CVE.

What this is

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.

Evidence readiness

The base CVE appears first. Independent evidence is added without blocking the page.

Investigation status

Checking for newly completed evidence

Refreshing

NIST NVD

NVD evidence is available in this response

Ready

CISA KEV

Known-exploitation catalog check is pending

Pending

FIRST EPSS

Forensia does not request or publish EPSS while source rights are under review

Rights pending

Reports

Report links are still being resolved

Pending

Relationships

Product and vulnerability relationships are still being prepared

Pending

Vulnerability intel

Local EPSS row, KEV flag, and catalog notes from stored metadata only.

Not in KEV

CVE: CVE-2025-12543
EPSS probability: not fetched / unavailable
EPSS fetched_at: 2026-08-11T10:44:17.711697Z

Affected products

Vendor/product strings parsed from local CPE URIs (no inferred ATT&CK).

Product	CPE (truncated)
Redhat Undertow	cpe:2.3:a:redhat:undertow::::::::
Redhat Single Sign-On 7.0	cpe:2.3:a:redhat:single_sign-on:7.0:::::::*
Redhat Process Automation 7.0	cpe:2.3:a:redhat:process_automation:7.0:::::::*
Redhat Jboss Enterprise Application Platform Expansion Pack	cpe:2.3:a:redhat:jboss_enterprise_application_platform_expansion_pack:-:::::::*
Redhat Jboss Enterprise Application Platform 7.0.0	cpe:2.3:a:redhat:jboss_enterprise_application_platform:7.0.0:::::::*
Redhat Jboss Enterprise Application Platform	cpe:2.3:a:redhat:jboss_enterprise_application_platform:-::::text-only:::
Redhat Jboss Enterprise Application Platform	cpe:2.3:a:redhat:jboss_enterprise_application_platform::::::::

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