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Fencer Vulns
high 7.5

CVE-2024-4027 json

Undertow: outofmemoryerror in httpservletrequestimpl.getparameternames() can cause remote dos attacks

published 2026-01-30 9 mo ago modified 2026-11-04 4 d ago also GHSA-33hj-rcmx-86mv , EUVD-2024-32593

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 34%
public exploits
0
none known

Summary

A flaw was found in Undertow. Servlets using a method that calls HttpServletRequestImpl.getParameterNames() can cause an OutOfMemoryError when the client sends a request with large parameter names. This issue can be exploited by an unauthorized user to cause a remote denial-of-service (DoS) attack.

Patch / fix

  • maven io.undertow:undertow-core 2.2.39.Final, 2.3.21.Final, 2.4.0.Beta1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2024-4027 updated cvss 7.5

undertow: OutOfMemoryError in HttpServletRequestImpl.getParameterNames() can cause remote DoS attacks

  • Red Hat build of Apicurio Registry 2 undertow undertow
    affected: workaround, no fix available “Currently no mitigation is available for this vulnerability. Please make sure to perform the update as they become available.”
  • Red Hat Fuse 7 undertow undertow Red Hat Integration Camel K 1 undertow undertow Red Hat Process Automation 7 undertow undertow
    affected: workaround, no fix planned “Currently no mitigation is available for this vulnerability. Please make sure to perform the update as they become available.”
  • Red Hat build of Quarkus quarkus-undertow Red Hat Data Grid 8 undertow undertow Red Hat JBoss Enterprise Application Platform 7 undertow undertow Red Hat JBoss Enterprise Application Platform 8 undertow undertow Red Hat JBoss Enterprise Application Platform Expansion Pack undertow undertow Red Hat Single Sign-On 7 undertow undertow
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
9 mo ago

Exploit prediction

0.40% chance of exploitation in the next 30 days, higher than 34% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
maven io.undertow:undertow-core
<2.2.39.Final
>=2.4.0.Alpha1, <2.4.0.Beta1
>=2.3.0.Alpha1, <2.3.21.Final
2.2.39.Final
2.4.0.Beta1
2.3.21.Final

Affected products

  • Red Hat Red Hat build of Apicurio Registry 2
  • Red Hat Red Hat build of Quarkus
  • Red Hat Red Hat Data Grid 8
  • Red Hat Red Hat Fuse 7
  • Red Hat Red Hat Integration Camel K 1
  • Red Hat Red Hat JBoss Enterprise Application Platform 7
  • Red Hat Red Hat JBoss Enterprise Application Platform 8
  • Red Hat Red Hat JBoss Enterprise Application Platform Expansion Pack
  • Red Hat Red Hat Process Automation 7
  • Red Hat Red Hat Single Sign-On 7

Classification

Weakness
  • CWE-20 Improper Input Validation
  • CWE-770 Allocation of Resources Without Limits or Throttling

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.