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01 Record

CVE-2025-12543

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

CriticalPUBLISHEDCNA: redhat
CNA base score9.6 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:L
View raw JSON

02 Description

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

03 Exploitation and scoring

Exploitation
Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.
SSVC decision
  • ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
  • AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
  • Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
1.33% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 70.6% of scored records. A rank, not a probability.
NVD base score
9.6 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
NVD analysis status
Modified. NVD last modified this record on 2026-10-14.
Red Hat severity
Important. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2026-01-07 16:04Z9 MO AGO
Last updated
2026-10-14 16:28Z15 DAYS AGO
Reserved
2025-10-31
Assigning CNA
redhat
Record state
PUBLISHED
Severity
Critical (CVSS 9.6)
CNA CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:L
Weaknesses
  • CWE-20Improper Input ValidationClass
Data version
5.2
Document digest
2593c43271e078ac2586e4511556d2f7095d8241142f93d3c1bb8dfd65129240

05 Affected products

VendorProductVersionsPlatforms
Red HatRed Hat build of Apache Camel 4.14.4 for Spring Boot 3.5.11Not specified—
Red HatRed Hat JBoss Enterprise Application Platform 7.1 EUS for RHEL 7Not specified—
Red HatRed Hat JBoss Enterprise Application Platform 7.3 EUS for RHEL 7Not specified—
Red HatRed Hat JBoss Enterprise Application Platform 7.4.24Not specified—
Red HatRed Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7Not specified—
Red HatRed Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8Not specified—
Red HatRed Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 9Not specified—
Red HatRed Hat JBoss Enterprise Application Platform 8.0Not specified—
Red HatRed Hat JBoss Enterprise Application Platform 8.0 for RHEL 8Not specified—
Red HatRed Hat JBoss Enterprise Application Platform 8.0 for RHEL 9Not specified—
Red HatRed Hat JBoss Enterprise Application Platform 8.1.3Not specified—
Red HatRed Hat JBoss Enterprise Application Platform 8.1 for RHEL 8Not specified—
Red HatRed Hat JBoss Enterprise Application Platform 8.1 for RHEL 9Not specified—
Red HatRed Hat Single Sign-On 7.6.13Not specified—
Red HatRed Hat Single Sign-On 7.6 for RHEL 7Not specified—
Red HatRed Hat Single Sign-On 7.6 for RHEL 8Not specified—
Red HatRed Hat Single Sign-On 7.6 for RHEL 9Not specified—
Red HatRHEL-8 based Middleware ContainersNot specified—
Red HatRed Hat build of Apache Camel - HawtIO 4Not specified—
Red HatRed Hat Data Grid 8Not specified—
Red HatRed Hat Enterprise Linux 10Not specified—
Red HatRed Hat Enterprise Linux 8Not specified—
Red HatRed Hat Enterprise Linux 9Not specified—
Red HatRed Hat Fuse 7Not specified—
Red HatRed Hat JBoss Enterprise Application Platform 7Not specified—
Red HatRed Hat JBoss Enterprise Application Platform Expansion PackNot specified—
Red HatRed Hat Process Automation 7Not specified—

06 References

07 Fixed in

Debian 14

  • undertow
    No fix yet

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 25.10

  • undertow
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 26.04 LTS

  • undertow
    Fixed in 2.3.20-1ubuntu1

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 26.10

  • undertow
    Fixed in 2.3.20-1ubuntu1

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 16.04 LTS

  • undertow
    Fixed in 1.3.16-1ubuntu0.1~esm1
    Available with Ubuntu Pro: https://ubuntu.com/pro

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 18.04 LTS

  • undertow
    Fixed in 1.4.23-3ubuntu0.1~esm1
    Available with Ubuntu Pro: https://ubuntu.com/pro

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 20.04 LTS

  • undertow
    Fixed in 2.0.29-1ubuntu0.1~esm1
    Available with Ubuntu Pro: https://ubuntu.com/pro

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 22.04 LTS

  • undertow
    Fixed in 2.2.16-1ubuntu0.1~esm1
    Available with Ubuntu Pro: https://ubuntu.com/pro

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 24.04 LTS

  • undertow
    Fixed in 2.3.8-2ubuntu0.1~esm1
    Available with Ubuntu Pro: https://ubuntu.com/pro

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.