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Full vulnerability report · 2024
CVE-2024-3653High confidence

Undertow: learningpushhandler can lead to remote memory dos attacks

Unknown · Unknown

Official source article: Red Hat RHSA-2024:4392 ↗. Check the applicable product and release in the original source.

5.3MediumCVSS 3.1
Recommended action
Scheduled

Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority.

Patch available
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityMediumOperational priority:Medium, unchanged from published severity.unchanged

Evidence used

  • No CISA KEV confirmation is currently recorded.
  • The selected CVSS metric records a network-reachable, unauthenticated path with no user interaction.
  • EPSS is 1.87% for the current model date.

Compensating controls

  • Validate the affected product branch and deploy the verified fixed release.
  • Restrict the affected network interface to trusted sources where business-safe.
  • Monitor vendor guidance and exploitation sources for a material change.

Verification

  1. Confirm that the asset runs Unknown Unknown and falls inside the recorded affected range.
  2. Verify the installed build against the product-specific fixed version after deployment.
  3. Validate exposure, authentication requirements and compensating controls in the actual environment.
  4. Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Mitigation target: As exposure requiresRemediation target: Within 365 days

This automated reassessment organises public evidence. It does not know asset exposure, business impact or control effectiveness and does not replace CVSS or a human risk decision.

Distribution package intelligence

Release-specific package status

Debian, ubuntu findings are scoped to the named distribution, release and source package. An absent finding does not mean a package is unaffected.

3 package states
Repository candidate not checked

A published vendor fix does not prove that a matching update is enabled and installable on a particular asset. Confirm the local package candidate before scheduling remediation.

Distribution releaseSource packageVendor stateFixed versionEvidence
Debian forkyforky · sourceundertowVendor fix publishedDebian records a fixed source-package version for this release.2.3.18-1Debian Security Tracker ↗Source updated 6 Oct 2026
Debian sidsid · sourceundertowVendor fix publishedDebian records a fixed source-package version for this release.2.3.18-1Debian Security Tracker ↗Source updated 6 Oct 2026
Ubuntu 24.04 LTSnoble · esm-appsundertowUnder evaluationCanonical reports that the package might be affected and still needs evaluation or fixing.Not published in this feedCanonical Ubuntu Security ↗Source updated 5 Oct 2026
Open-source package ranges2 source-attributed ranges

These OSV and GitHub advisory ranges apply only to the named package and ecosystem. A listed fixed version is not a universal product patch or proof that an update is installed.

Ecosystem and packageAffected rangeFirst fixed versionEvidence
mavenio.undertow:undertow-core>= 2.3.0.Alpha1, < 2.3.15.Final2.3.15.FinalGitHub advisory ↗github reviewed aggregator · 4 Nov 2024
mavenio.undertow:undertow-core< 2.2.34.Final2.2.34.FinalGitHub advisory ↗github reviewed aggregator · 4 Nov 2024
Direct vendor intelligence

Authoritative vendor CSAF and VEX advisories

Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.

1 current
CVE-2024-3653 · CSAF 2.0 · revision 3 · finalRed Hat Product Securityundertow: LearningPushHandler can lead to remote memory DoS attacks
13 known affected

The vendor explicitly identifies these products as affected by this CVE.

  • undertow as a component of OpenShift Serverless
  • undertow as a component of Red Hat build of Apache Camel 4 for Quarkus 3
  • undertow as a component of Red Hat build of Apache Camel for Spring Boot 4
  • undertow as a component of Red Hat build of OptaPlanner 8
  • undertow as a component of Red Hat Data Grid 8
  • undertow as a component of Red Hat Fuse 7
  • undertow as a component of Red Hat Integration Camel K 1
  • undertow as a component of Red Hat Integration Camel Quarkus 2
  • undertow as a component of Red Hat JBoss Data Grid 7
  • undertow as a component of Red Hat JBoss Fuse Service Works 6
  • undertow as a component of Red Hat Process Automation 7
  • undertow as a component of Red Hat Single Sign-On 7
Summary
A vulnerability was found in Undertow. This issue requires enabling the learning-push handler in the server's config, which is disabled by default, leaving the maxAge config in the handler unconfigured. The default is -1, which makes the handler vulnerable. If someone overwrites that config, the server is not subject to the attack. The attacker needs to be able to reach the server with a normal HTTP request.
Remediation
Before applying this update, ensure all previously released errata relevant to your system have been applied. Also, back up your existing installation, including all applications, configuration files, databases and database settings. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Choose official national sources for this report. Each advisory shows its original language. Your selection is remembered on this device and included in shared links.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2024-2322

No EUVD known-exploited evidence

A vulnerability was found in Undertow. This issue requires enabling the learning-push handler in the server's config, which is disabled by default, leaving the maxAge config in the handler unconfigured. The default is -1, which makes the handler vulnerable. If someone overwrites that config, the server is not subject to the attack. The attacker needs to be able to reach the server with a normal HTTP request.

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
5.3 · CVSS 3.1
Advisory evidence
No linked advisory details stored yet
Recommended actionScheduled

Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority.

Patch available
01

What, why and how

A vulnerability was found in Undertow. This issue requires enabling the learning-push handler in the server's config, which is disabled by default, leaving the maxAge config in the handler unconfigured. The default is -1, which makes the handler vulnerable. If someone overwrites that config, the server is not subject to the attack. The attacker needs to be able to reach the server with a normal HTTP request.

What

A vulnerability was found in Undertow. This issue requires enabling the learning-push handler in the server's config, which is disabled by default, leaving the maxAge config in the handler unconfigured. The default is -1, which makes the handler vulnerable. If someone overwrites that config, the server is not subject to the attack. The attacker needs to be able to reach the server with a normal HTTP request.

Why

The product does not sufficiently track and release allocated memory after it has been used, making the memory unavailable for reallocation and reuse.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

What

A vulnerability was found in Undertow. This issue requires enabling the learning-push handler in the server's config, which is disabled by default, leaving the maxAge config in the handler unconfigured. The default is -1, which makes the handler vulnerable. If someone overwrites that config, the server is not subject to the attack. The attacker needs to be able to reach the server with a normal HTTP request.

Why

The product does not sufficiently track and release allocated memory after it has been used, making the memory unavailable for reallocation and reuse.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
None recorded

No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.

Likely attack path
a network path → Missing Release of Memory after Effective Lifetime → cause the confidentiality, integrity or availability impact described by the vendor
Attack surface
Network
Privileges required
None: unauthenticated exploitation is possible
User interaction
None
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Unchanged: impact remains within the vulnerable component's security authority
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-401 ↗

CWE-401: Missing Release of Memory after Effective Lifetime. The product does not sufficiently track and release allocated memory after it has been used, making the memory unavailable for reallocation and reuse.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.

AVNetworkAttack vector: The vulnerable component can be reached over a network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRNonePrivileges required: The attacker does not need an account or existing privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CNoneConfidentiality impact: No direct loss is represented by this metric.INoneIntegrity impact: No direct loss is represented by this metric.ALowAvailability impact: A successful attack can cause a limited loss.
Post-exploitation / living off the land
No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.
NetworkUnauthenticatedCWE-401
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

ENISA EUVD · EUVD-2024-2322Official EUVD mapping

A vulnerability was found in Undertow. This issue requires enabling the learning-push handler in the server's config, which is disabled by default, leaving the maxAge config in the handler unconfigured. The default is -1, which makes the handler vulnerable. If someone overwrites that config, the server is not subject to the attack. The attacker needs to be able to reach the server with a normal HTTP request.

Official EUVD record ↗
BSI · German · WID-SEC-2024-2206Red Hat JBoss Enterprise Anwendungsplattform: Mehrere Schwachstellen ermöglichen Denial of Service

Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in Red Hat JBoss Enterprise Application Platform ausnutzen, um einen Denial of Service Angriff durchzuführen.

Official advisory ↗
Cyber Security Agency of Singapore · English · CSA-SB-20240710Security Bulletin 10 Jul 2024

The Cyber Security Agency of Singapore included this CVE in its official Security Bulletin 10 Jul 2024, published on 10 July 2024. Open the linked bulletin for the product, severity and reference information published in that issue.

Official advisory ↗
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Patch available
Affected
Fixed
Action
Before applying this update, ensure all previously released errata relevant to your system have been applied. Also, back up your existing installation, including all applications, configuration files, databases and database settings. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
Workaround
No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.
04

Evidence and provenance

Published 8 Jul 2024 · Last source change 8 Sept 2026, 23:07 UTC · CWE-401 · Missing Release of Memory after Effective Lifetime

CVE recordCVE.org · 5.2
CVSS sourceCNA
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-08-14
European sourceENISA EUVD · EUVD-2024-2322
Product sourceVendor CSAF · Red Hat Product Security
Remediation sourceVendor CSAF · Red Hat Product Security
CWE sourceCNA
NVD statusNVD not scheduled

Missing structured fields: affected product. Missing data is not evidence of low risk; review the primary advisory.

Material change intelligence

What changed after publication

View recent updates ↗
  1. Affected versionsThe structured affected or fixed version information changed.
    Before
    ≤ 2.3.14.Final · Fixed: Red Hat build of Quarkus 3.8.6.redhat: 5.2.4.redhat-00001 < *; Red Hat JBoss Enterprise Application Platform 7.4 for RHEL 8: 0:2.2.33-1.SP1_redhat_00001.1.el8eap < *; Red Hat JBoss Enterprise Application Platform 7.4 for RHEL 9: 0:2.2.33-1.SP1_redhat_00001.1.el9eap < *; Red Hat JBoss Enterprise Application Platform 7.4 on RHEL 7: 0:2.2.33-1.SP1_redhat_00001.1.el7eap < *
    After
    ≤ 2.3.14.Final · Fixed: Red Hat build of Quarkus 3.8.6.redhat: 5.2.4.redhat-00001 < *; Red Hat JBoss Enterprise Application Platform: 2.2.33.SP1-redhat-00001 < *; Red Hat JBoss Enterprise Application Platform 7.4 for RHEL 8: 0:2.2.33-1.SP1_redhat_00001.1.el8eap < *; Red Hat JBoss Enterprise Application Platform 7.4 for RHEL 9: 0:2.2.33-1.SP1_redhat_00001.1.el9eap < *; Red Hat JBoss Enterprise Application Platform 7.4 on RHEL 7: 0:2.2.33-1.SP1_redhat_00001.1.el7eap < *
    CNA ↗
  2. Affected versionsThe structured affected or fixed version information changed.
    Before
    ≤ 2.3.14.Final · Fixed: 5.2.4.redhat-00001 < *; 0:2.2.33-1.SP1_redhat_00001.1.el8eap < *; 0:2.2.33-1.SP1_redhat_00001.1.el9eap < *; 0:2.2.33-1.SP1_redhat_00001.1.el7eap < *
    After
    ≤ 2.3.14.Final · Fixed: 5.2.4.redhat-00001 < *; 2.2.33.SP1-redhat-00001 < *; 0:2.2.33-1.SP1_redhat_00001.1.el8eap < *; 0:2.2.33-1.SP1_redhat_00001.1.el9eap < *; 0:2.2.33-1.SP1_redhat_00001.1.el7eap < *
    CNA ↗
  3. Affected versionsThe structured affected or fixed version information changed.
    Before
    ≤ 2.3.14.Final · Fixed: 5.2.4.redhat-00001 < *; 2.2.33.SP1-redhat-00001 < *; 0:2.2.33-1.SP1_redhat_00001.1.el8eap < *; 0:2.2.33-1.SP1_redhat_00001.1.el9eap < *; 0:2.2.33-1.SP1_redhat_00001.1.el7eap < *
    After
    ≤ 2.3.14.Final · Fixed: Red Hat build of Quarkus 3.8.6.redhat: 5.2.4.redhat-00001 < *; Red Hat JBoss Enterprise Application Platform 7.4 for RHEL 8: 0:2.2.33-1.SP1_redhat_00001.1.el8eap < *; Red Hat JBoss Enterprise Application Platform 7.4 for RHEL 9: 0:2.2.33-1.SP1_redhat_00001.1.el9eap < *; Red Hat JBoss Enterprise Application Platform 7.4 on RHEL 7: 0:2.2.33-1.SP1_redhat_00001.1.el7eap < *
    CNA ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Fixed release or patch reference recorded
ENISA EUVD · EUVD-2024-2322↗Vendor CSAF · Red Hat Product Security↗CVE authority or vendor reference · Red Hat RHSA-2024:4392↗Official CVE record (CNA and ADP data)↗NVD record↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2024-3653 · cve.blacktree.nl