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CVE Record

CVE-2025-12543: Undertow-core: undertow http server fails to reject malformed host headers leading to potential cache poisoning and ssrf

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.

CriticalCVSS 9.6Not KEV-listedUpdated
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Potential ATT&CK relevance

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CVE-2025-12543 mapping review

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Vulnerability profileCVE Program record
Severity
Critical
CVSS
9.6 (3.1)
Known Exploited
No
Published

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

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

2CVSS vectors
7Timeline events
2ADP providers
22Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: pocAutomatable: noTechnical Impact: total

CVSS vector scores

2 official scores

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
9.6CVSS 3.1CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:L2.86redhat
9.6CVSS 3.1CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:L2.86redhat-SADP

Vulnerability scoring details

Base CVSS 3.1 score

9.6Critical
CVSS 3.1 vector shape for CVE-2025-12543Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. ADP timelineredhat-SADP

    Reported to Red Hat.

  2. Source timelineredhat

    Reported to Red Hat.

  3. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  4. CVE publishedCVE Program

    The CVE record was published.

  5. ADP timelineredhat-SADP

    Made public.

  6. Source timelineredhat

    Made public.

  7. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc
redhat-SADPundertow-core: Undertow HTTP Server Fails to Reject Malformed Host Headers Leading to Potential Cache Poisoning and SSRF
other:Red Hat severity ratingcvssV3_1
  • 2025-10-31T06:15:35.424Z: Reported to Red Hat.
  • 2026-01-08T00:00:00.000Z: Made public.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
Red HatRed Hat build of Apache Camel 4.14.4 for Spring Boot 3.5.11undertow-coreunaffected
Red HatRed Hat JBoss Enterprise Application Platform 7.1 EUS for RHEL 7eap7-undertow, 0:1.4.18-21.SP19_redhat_00001.1.ep7.el7affected
Red HatRed Hat JBoss Enterprise Application Platform 7.3 EUS for RHEL 7eap7-undertow, 0:2.0.41-8.SP9_redhat_00001.1.el7eapaffected
Red HatRed Hat JBoss Enterprise Application Platform 7.4.24io.undertow/undertow-core, 2.2.39.Final-redhat-00001affected
Red HatRed Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7eap7-undertow, 0:2.2.39-1.Final_redhat_00001.1.el7eapaffected
Red HatRed Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7eap7-wildfly, 0:7.4.24-4.GA_redhat_00002.1.el7eapaffected
Red HatRed Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8eap7-undertow, 0:2.2.39-1.Final_redhat_00001.1.el8eapaffected
Red HatRed Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8eap7-wildfly, 0:7.4.24-4.GA_redhat_00002.1.el8eapaffected
Red HatRed Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 9eap7-undertow, 0:2.2.39-1.Final_redhat_00001.1.el9eapaffected
Red HatRed Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 9eap7-wildfly, 0:7.4.24-4.GA_redhat_00002.1.el9eapaffected
Red HatRed Hat JBoss Enterprise Application Platform 8.0undertow-coreunaffected
Red HatRed Hat JBoss Enterprise Application Platform 8.0 for RHEL 8eap8-bouncycastle, 0:1.83.0-1.redhat_00001.1.el8eapaffected
Red HatRed Hat JBoss Enterprise Application Platform 8.0 for RHEL 8eap8-guava-libraries, 0:33.0.0-2.jre_redhat_00003.1.el8eapaffected
Red HatRed Hat JBoss Enterprise Application Platform 8.0 for RHEL 8eap8-jaxb, 0:4.0.6-1.redhat_00001.1.el8eapaffected
Red HatRed Hat JBoss Enterprise Application Platform 8.0 for RHEL 8eap8-jcip-annotations, 0:1.0.0-3.redhat_00009.1.el8eapaffected
Red HatRed Hat JBoss Enterprise Application Platform 8.0 for RHEL 8eap8-slf4j-jboss-logmanager, 0:2.0.2-1.Final_redhat_00001.1.el8eapaffected
Red HatRed Hat JBoss Enterprise Application Platform 8.0 for RHEL 8eap8-undertow, 0:2.3.23-1.SP3_redhat_00001.1.el8eapaffected
Red HatRed Hat JBoss Enterprise Application Platform 8.0 for RHEL 9eap8-bouncycastle, 0:1.83.0-1.redhat_00001.1.el9eapaffected
Red HatRed Hat JBoss Enterprise Application Platform 8.0 for RHEL 9eap8-guava-libraries, 0:33.0.0-2.jre_redhat_00003.1.el9eapaffected
Red HatRed Hat JBoss Enterprise Application Platform 8.0 for RHEL 9eap8-jaxb, 0:4.0.6-1.redhat_00001.1.el9eapaffected
Red HatRed Hat JBoss Enterprise Application Platform 8.0 for RHEL 9eap8-jcip-annotations, 0:1.0.0-3.redhat_00009.1.el9eapaffected
Red HatRed Hat JBoss Enterprise Application Platform 8.0 for RHEL 9eap8-slf4j-jboss-logmanager, 0:2.0.2-1.Final_redhat_00001.1.el9eapaffected
Red HatRed Hat JBoss Enterprise Application Platform 8.0 for RHEL 9eap8-undertow, 0:2.3.23-1.SP3_redhat_00001.1.el9eapaffected
Red HatRed Hat JBoss Enterprise Application Platform 8.1.3io.undertow/undertow-core, 2.3.20.SP4-redhat-00001affected
Red HatRed Hat JBoss Enterprise Application Platform 8.1 for RHEL 8eap8-apache-cxf, 0:4.0.10-1.redhat_00001.1.el8eapaffected
Red HatRed Hat JBoss Enterprise Application Platform 8.1 for RHEL 8eap8-bouncycastle, 0:1.82.0-1.redhat_00001.1.el8eapaffected
Red HatRed Hat JBoss Enterprise Application Platform 8.1 for RHEL 8eap8-eap-product-conf-parent, 0:801.3.0-1.GA_redhat_00001.1.el8eapaffected
Red HatRed Hat JBoss Enterprise Application Platform 8.1 for RHEL 8eap8-eventstream, 0:1.0.1-3.redhat_00003.1.el8eapaffected
Red HatRed Hat JBoss Enterprise Application Platform 8.1 for RHEL 8eap8-hibernate, 0:6.6.36-1.Final_redhat_00001.1.el8eapaffected
Red HatRed Hat JBoss Enterprise Application Platform 8.1 for RHEL 8eap8-jboss-el-api_5.0_spec, 0:4.0.2-1.Final_redhat_00001.1.el8eapaffected
Weakness

CWE details

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CWE-20 · source CWE mapping

Improper Input Validation

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