CVE-2025-12543 (GCVE-0-2025-12543)

Vulnerability from cvelistv5 – Published: 2026-01-07 16:04 – Updated: 2026-03-05 19:17
VLAI?
Title
Undertow-core: undertow http server fails to reject malformed host headers leading to potential cache poisoning and ssrf
Summary
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.
Severity ?
9.6 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:L
CWE
  • CWE-20 - Improper Input Validation
Assigner
References
https://access.redhat.com/errata/RHSA-2026:0383 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:0384 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:0386 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:3889 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:3890 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:3891 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:3892 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2025-12543 vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2408784 issue-trackingx_refsource_REDHAT
Impacted products
Vendor Product Version
Red Hat Red Hat build of Apache Camel 4.14.4 for Spring Boot 3.5.11     cpe:/a:redhat:apache_camel_spring_boot:4.14
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    Red Hat Red Hat JBoss Enterprise Application Platform 8.0     cpe:/a:redhat:jboss_enterprise_application_platform:8.0::el8
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    Red Hat Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8 Unaffected: 0:1.83.0-1.redhat_00001.1.el8eap , < * (rpm)
    cpe:/a:redhat:jboss_enterprise_application_platform:8.0::el8
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    Red Hat Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8 Unaffected: 0:33.0.0-2.jre_redhat_00003.1.el8eap , < * (rpm)
    cpe:/a:redhat:jboss_enterprise_application_platform:8.0::el8
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    Red Hat Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8 Unaffected: 0:4.0.6-1.redhat_00001.1.el8eap , < * (rpm)
    cpe:/a:redhat:jboss_enterprise_application_platform:8.0::el8
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    Red Hat Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8 Unaffected: 0:1.0.0-3.redhat_00009.1.el8eap , < * (rpm)
    cpe:/a:redhat:jboss_enterprise_application_platform:8.0::el8
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    Red Hat Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8 Unaffected: 0:2.0.2-1.Final_redhat_00001.1.el8eap , < * (rpm)
    cpe:/a:redhat:jboss_enterprise_application_platform:8.0::el8
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    Red Hat Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8 Unaffected: 0:2.3.23-1.SP3_redhat_00001.1.el8eap , < * (rpm)
    cpe:/a:redhat:jboss_enterprise_application_platform:8.0::el8
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    Red Hat Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9 Unaffected: 0:1.83.0-1.redhat_00001.1.el9eap , < * (rpm)
    cpe:/a:redhat:jboss_enterprise_application_platform:8.0::el9
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    Red Hat Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9 Unaffected: 0:33.0.0-2.jre_redhat_00003.1.el9eap , < * (rpm)
    cpe:/a:redhat:jboss_enterprise_application_platform:8.0::el9
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    Red Hat Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9 Unaffected: 0:4.0.6-1.redhat_00001.1.el9eap , < * (rpm)
    cpe:/a:redhat:jboss_enterprise_application_platform:8.0::el9
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    Red Hat Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9 Unaffected: 0:1.0.0-3.redhat_00009.1.el9eap , < * (rpm)
    cpe:/a:redhat:jboss_enterprise_application_platform:8.0::el9
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    Red Hat Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9 Unaffected: 0:2.0.2-1.Final_redhat_00001.1.el9eap , < * (rpm)
    cpe:/a:redhat:jboss_enterprise_application_platform:8.0::el9
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    Red Hat Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9 Unaffected: 0:2.3.23-1.SP3_redhat_00001.1.el9eap , < * (rpm)
    cpe:/a:redhat:jboss_enterprise_application_platform:8.0::el9
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    Red Hat Red Hat JBoss Enterprise Application Platform 8.1     cpe:/a:redhat:jboss_enterprise_application_platform:8.0::el8
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    Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 Unaffected: 0:4.0.10-1.redhat_00001.1.el8eap , < * (rpm)
    cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el8
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    Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 Unaffected: 0:1.82.0-1.redhat_00001.1.el8eap , < * (rpm)
    cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el8
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    Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 Unaffected: 0:801.3.0-1.GA_redhat_00001.1.el8eap , < * (rpm)
    cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el8
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    Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 Unaffected: 0:1.0.1-3.redhat_00003.1.el8eap , < * (rpm)
    cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el8
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    Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 Unaffected: 0:6.6.36-1.Final_redhat_00001.1.el8eap , < * (rpm)
    cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el8
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    Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 Unaffected: 0:4.0.2-1.Final_redhat_00001.1.el8eap , < * (rpm)
    cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el8
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    Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 Unaffected: 0:2.5.0-1.redhat_00001.1.el8eap , < * (rpm)
    cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el8
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    Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 Unaffected: 0:2.3.20-2.SP4_redhat_00001.1.el8eap , < * (rpm)
    cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el8
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    Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 Unaffected: 0:8.1.3-4.GA_redhat_00006.1.el8eap , < * (rpm)
    cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el8
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    Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 Unaffected: 0:5.0.12-1.Final_redhat_00001.1.el8eap , < * (rpm)
    cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el8
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    Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 Unaffected: 0:2.6.6-1.Final_redhat_00001.1.el8eap , < * (rpm)
    cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el8
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    Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 Unaffected: 0:8.1.1-4.GA_redhat_00007.1.el8eap , < * (rpm)
    cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el8
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    Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 Unaffected: 0:4.0.10-1.redhat_00001.1.el9eap , < * (rpm)
    cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el9
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    Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 Unaffected: 0:1.82.0-1.redhat_00001.1.el9eap , < * (rpm)
    cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el9
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    Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 Unaffected: 0:801.3.0-1.GA_redhat_00001.1.el9eap , < * (rpm)
    cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el9
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    Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 Unaffected: 0:1.0.1-3.redhat_00003.1.el9eap , < * (rpm)
    cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el9
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    Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 Unaffected: 0:6.6.36-1.Final_redhat_00001.1.el9eap , < * (rpm)
    cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el9
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    Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 Unaffected: 0:4.0.2-1.Final_redhat_00001.1.el9eap , < * (rpm)
    cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el9
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    Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 Unaffected: 0:2.5.0-1.redhat_00001.1.el9eap , < * (rpm)
    cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el9
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    Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 Unaffected: 0:2.3.20-2.SP4_redhat_00001.1.el9eap , < * (rpm)
    cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el9
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    Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 Unaffected: 0:8.1.3-4.GA_redhat_00006.1.el9eap , < * (rpm)
    cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el9
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    Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 Unaffected: 0:5.0.12-1.Final_redhat_00001.1.el9eap , < * (rpm)
    cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el9
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    Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 Unaffected: 0:2.6.6-1.Final_redhat_00001.1.el9eap , < * (rpm)
    cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el9
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    Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 Unaffected: 0:8.1.1-4.GA_redhat_00007.1.el9eap , < * (rpm)
    cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el9
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    Red Hat Red Hat build of Apache Camel - HawtIO 4     cpe:/a:redhat:apache_camel_hawtio:4
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    Red Hat Red Hat Data Grid 8     cpe:/a:redhat:jboss_data_grid:8
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    Red Hat Red Hat Enterprise Linux 10     cpe:/o:redhat:enterprise_linux:10
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    Red Hat Red Hat Enterprise Linux 8     cpe:/o:redhat:enterprise_linux:8
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    Red Hat Red Hat Enterprise Linux 8     cpe:/o:redhat:enterprise_linux:8
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    Red Hat Red Hat Enterprise Linux 9     cpe:/o:redhat:enterprise_linux:9
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    Red Hat Red Hat Fuse 7     cpe:/a:redhat:jboss_fuse:7
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    Red Hat Red Hat JBoss Enterprise Application Platform 7     cpe:/a:redhat:jboss_enterprise_application_platform:7
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    Red Hat Red Hat JBoss Enterprise Application Platform Expansion Pack     cpe:/a:redhat:jbosseapxp
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    Red Hat Red Hat Process Automation 7     cpe:/a:redhat:jboss_enterprise_bpms_platform:7
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    Red Hat Red Hat Single Sign-On 7     cpe:/a:redhat:red_hat_single_sign_on:7
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Credits
Red Hat would like to thank Ahmet Artuç for reporting this issue.
Show details on NVD website
To clipboard 

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          "packageName": "eap8-jaxb",
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          "cpes": [
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          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "cpes": [
            "cpe:/a:redhat:jboss_enterprise_application_platform:8.0::el8"
          ],
          "defaultStatus": "affected",
          "packageName": "eap8-slf4j-jboss-logmanager",
          "product": "Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8",
          "vendor": "Red Hat",
          "versions": [
            {
              "lessThan": "*",
              "status": "unaffected",
              "version": "0:2.0.2-1.Final_redhat_00001.1.el8eap",
              "versionType": "rpm"
            }
          ]
        },
        {
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "cpes": [
            "cpe:/a:redhat:jboss_enterprise_application_platform:8.0::el8"
          ],
          "defaultStatus": "affected",
          "packageName": "eap8-undertow",
          "product": "Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8",
          "vendor": "Red Hat",
          "versions": [
            {
              "lessThan": "*",
              "status": "unaffected",
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          "cpes": [
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        {
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "cpes": [
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          "defaultStatus": "affected",
          "packageName": "eap8-guava-libraries",
          "product": "Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9",
          "vendor": "Red Hat",
          "versions": [
            {
              "lessThan": "*",
              "status": "unaffected",
              "version": "0:33.0.0-2.jre_redhat_00003.1.el9eap",
              "versionType": "rpm"
            }
          ]
        },
        {
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "cpes": [
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          "defaultStatus": "affected",
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        {
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "cpes": [
            "cpe:/a:redhat:jboss_enterprise_application_platform:8.0::el9"
          ],
          "defaultStatus": "affected",
          "packageName": "eap8-undertow",
          "product": "Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9",
          "vendor": "Red Hat",
          "versions": [
            {
              "lessThan": "*",
              "status": "unaffected",
              "version": "0:2.3.23-1.SP3_redhat_00001.1.el9eap",
              "versionType": "rpm"
            }
          ]
        },
        {
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "cpes": [
            "cpe:/a:redhat:jboss_enterprise_application_platform:8.0::el8"
          ],
          "defaultStatus": "unaffected",
          "packageName": "undertow-core",
          "product": "Red Hat JBoss Enterprise Application Platform 8.1",
          "vendor": "Red Hat"
        },
        {
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "cpes": [
            "cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el8"
          ],
          "defaultStatus": "affected",
          "packageName": "eap8-apache-cxf",
          "product": "Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8",
          "vendor": "Red Hat",
          "versions": [
            {
              "lessThan": "*",
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          ]
        },
        {
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
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            "cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el8"
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          "defaultStatus": "affected",
          "packageName": "eap8-bouncycastle",
          "product": "Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8",
          "vendor": "Red Hat",
          "versions": [
            {
              "lessThan": "*",
              "status": "unaffected",
              "version": "0:1.82.0-1.redhat_00001.1.el8eap",
              "versionType": "rpm"
            }
          ]
        },
        {
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}


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Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.