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Vulnerabilities

Vulnerability · CVE-2025-12543

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

Published Jan 7, 2026 · catalog updated Oct 14, 2026 · build of apache camel

Check if you run it

No confirmed exploitation is on record for CVE-2025-12543. EPSS is 1.33%. Act only if a listed version of build of apache camel is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Critical9.6
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
1.33%
Remediation
Advisory link
Affected products
cpe redhat/build of apache camel · cpe redhat/data grid · cpe redhat/fuse · cpe redhat/jboss enterprise application platform · cpe redhat/jboss enterprise application platform expansion pack

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe redhat/build of apache camelversion unspecified
  • cpe redhat/data grid8.0
  • cpe redhat/fuse7.0.0
  • cpe redhat/jboss enterprise application platform7.0.0
  • cpe redhat/jboss enterprise application platform expansion packversion unspecified

How to fix CVE-2025-12543

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-12543. EPSS is 1.33%. Act only if a listed version of build of apache camel is installed.

Which versions are affected?

Compare what you have installed with redhat/data grid 8.0; redhat/jboss enterprise application platform 7.0.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-20: Improper Input Validation. EPSS 1.33%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Jan 7, 2026 · NIST NVD

    Detected

    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 session

  2. Oct 14, 2026 · NIST NVD

    Updated

    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 session

Sources

  • CVE.orgVulnerability recordCVE-2025-12543

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-12543

    30-day exploitation probability 1.3%

    first.org
  • NIST NVDVulnerability recordCVE-2025-12543

    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

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 16, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.