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Vulnerabilities/CVE-2025-12543Public Intelligence Dossier
Source: redhat · Limited verification•Last verified: •Collection Running
CVE-2025-12543Unknown / EvaluatingCRITICAL (raw)CVSS 9.6CWE-20

A flaw was found in the Undertow HTTP server core, which is used in WildFly, JBoss EAP, and other Java applications

Published: 07 Jan 2026•Last updated: 14 Oct 2026, 10:47 PM IST•Source identifier: secalert@redhat.com
Dossier completeness: source-provided sections 2 / 3 · rule guidance available. Missing source facts count as incomplete.
Official source
CISA KEV catalog
Unknown
KEV status was not determined.
CVSS score
9.6CRITICAL (raw)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:L
Metric sourcesecalert@redhat.com
EPSS probability
1.3%0.013
Percentile71st
Weakness type
CWE-20
No further CWE recorded
Remediation
Patch status unknown
No fixed version or KB recorded

Why It Matters

Analysis dossier

Why It Matters

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.

SOC priority

High Severity / Review

Actively exploited

Unknown

Publicly disclosed

Unknown

Risk basis: SOC ecosystem technology relevance; CRITICAL severity; Critical CVSS without confirmed KEV exploitation

Affected Products & Remediation

8 source-backed products
Affected products and versions (source)
  • redhat build of apache camel · < 4.14.4 · NVD CPE · Source
  • redhat data grid · 8.0 · NVD CPE · Source
  • redhat fuse · 7.0.0 · NVD CPE · Source
  • redhat jboss enterprise application platform · >= 8.0 < 8.0.12; >= 8.1.0 < 8.1.3; 7.0.0 · NVD CPE · Source
  • redhat jboss enterprise application platform expansion pack · version range not provided by source · NVD CPE · Source
  • redhat process automation · 7.0 · NVD CPE · Source
  • redhat single sign-on · 7.0 · NVD CPE · Source
  • redhat undertow · < 2.2.39; >= 2.3.0 < 2.3.21 · NVD CPE · Source
Recorded patch / KBNot provided by source

Vendor or catalog guidance (source)

Not provided by source

Known exploitation (source facts)

Only what a source states. Unknown means no source has said either way; it is not "not exploited".

CISA KEV
Unknown
Exploited (source statement)
Unknown
Publicly disclosed (source)
Unknown

Suggested hunting (rule-based inference)

SecOps Signal recommendation (rule-based inference). These steps are hunting hypotheses from the vulnerability class; they do not state or imply that exploitation occurred here or anywhere.

Matched user-interaction-client (CVSS AV:N, CVSS UI:R)

Exposure

  1. Identify endpoints reporting this CVE, especially those used for email and web browsing.Telemetry: DeviceTvmSoftwareVulnerabilities · A network vector that needs user interaction points at user-facing client software. · Rule user-interaction-client

Exploitation evidence

  1. Review unusual child processes started by the affected client application on affected endpoints.Telemetry: DeviceProcessEvents · Hunting hypothesis from the CVSS vector; it does not show that exploitation occurred. · Rule user-interaction-client

Response

  1. Confirm the source-stated update on affected endpoints.Telemetry: DeviceTvmSoftwareVulnerabilities · A follow-up inventory check verifies remediation. · Rule user-interaction-client

CISA KEV Record

CISA KEV status was not determined for this record.

Change History & Source Data

— No recorded material change

CNA / source
secalert@redhat.com
Record status · verification
UPDATED · NVD API
CPE
cpe:2.3:a:redhat:build_of_apache_camel:*:*:*:*:*:spring_boot:*:*, cpe:2.3:a:redhat:data_grid:8.0:*:*:*:*:*:*:*, cpe:2.3:a:redhat:fuse:7.0.0:*:*:*:*:*:*:*, cpe:2.3:a:redhat:jboss_enterprise_application_platform:*:*:*:*:*:*:*:*, cpe:2.3:a:redhat:jboss_enterprise_application_platform:-:*:*:*:text-only:*:*:*, cpe:2.3:a:redhat:jboss_enterprise_application_platform:7.0.0:*:*:*:*:*:*:*, cpe:2.3:a:redhat:jboss_enterprise_application_platform_expansion_pack:-:*:*:*:*:*:*:*, cpe:2.3:a:redhat:process_automation:7.0:*:*:*:*:*:*:*, cpe:2.3:a:redhat:single_sign-on:7.0:*:*:*:*:*:*:*, cpe:2.3:a:redhat:undertow:*:*:*:*:*:*:*:*

Evidence & Provenance

3 public sources
access.redhat.comSource recordnvd.nist.govSource recordaccess.redhat.comSource record

Linked by the query's stored exact CVE association. Review required tables and validation status before use.

Detection Hunting Query
Target: DeviceTvmSoftwareVulnerabilities•Defender XDR
Detect endpoints exposed to CVE-2025-12543
Purpose: Exposure assessment (Category: Exposure Check)Why linked: Query metadata names CVE-2025-12543
DeviceTvmSoftwareVulnerabilities| where CveId == "CVE-2025-12543"| project DeviceId, DeviceName, OSPlatform, OSVersion, SoftwareVendor, SoftwareName, SoftwareVersion, CveId, VulnerabilitySeverityLevel, RecommendedSecurityUpdate, RecommendedSecurityUpdateId| sort by VulnerabilitySeverityLevel desc
Schema Checked · Not runtime validatedSource: SecOps Signal deterministic template · Limited verificationStatic screening: Passed structure and schema checks; tenant execution is not verified.
Open KQL Library

Correlated briefings

— No published briefing references this CVE

SecOps Signal surfaces public advisory facts only. A missing value means the source has not published it, not that your environment is unaffected. No tenant inventory is connected.