# CVE-2024-5971: Undertow: response write hangs in case of java 17 tlsv1.3 newsessionticket

Status: published. Published: 2024-07-08. Updated: 2026-11-07.

A vulnerability was found in Undertow, where the chunked response hangs after the body was flushed. The response headers and body were sent but the client would continue waiting as Undertow does not send the expected 0\r\n termination of the chunked response. This results in uncontrolled resource consumption, leaving the server side to a denial of service attack. This happens only with Java 17 TLSv1.3 scenarios.

## Remediation

- workaround: Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability. (source: CNA: redhat)

## Affected products and versions

-  /  (undertow): ≥ 0; < 2.2.34.Final (affected, custom); ≥ 2.3.0.Alpha1; < 2.3.15.Final (affected, custom). Source: CNA: redhat
- Red Hat / Red Hat build of Apache Camel 3.20.7 for Spring Boot (undertow): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat build of Apache Camel 4.4.1 for Spring Boot 3.2 (undertow): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat build of Apache Camel 4.4.2 for Spring Boot: Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform (io.undertow/undertow-core): ≥ 2.2.33.SP1-redhat-00001; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 for RHEL 8 (eap7-undertow): ≥ 0:2.2.33-1.SP1_redhat_00001.1.el8eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 for RHEL 9 (eap7-undertow): ≥ 0:2.2.33-1.SP1_redhat_00001.1.el9eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 on RHEL 7 (eap7-undertow): ≥ 0:2.2.33-1.SP1_redhat_00001.1.el7eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8 (undertow-core): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat build of Apache Camel for Spring Boot 3 (undertow): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat build of Apache Camel - HawtIO 4 (undertow): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Build of Keycloak (undertow): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat build of Quarkus (quarkus-undertow): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Data Grid 8 (undertow): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Fuse 7 (undertow): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Integration Camel K 1 (undertow): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat JBoss Data Grid 7 (undertow): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 7 (undertow-core): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform Expansion Pack (undertow-core): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Process Automation 7 (undertow): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Single Sign-On 7 (undertow): Version range not reported. Source: CNA: redhat

## Severity and prioritization

- CVSS 3.1: 7.5 (high); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H; source: CNA: redhat

- CISA KEV: No listing in collected sources

- EPSS: 2.92% as of 2026-11-06; percentile 87.10%

- SSVC: exploitation none; automatable yes; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-674

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://access.redhat.com/errata/RHSA-2024:4392 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2024:4884 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2024:5143 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2024:5144 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2024:5145 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2024:5147 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2024:6508 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2024:6883 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/security/cve/CVE-2024-5971 (CNA: redhat; vdb-entry, x_refsource_REDHAT)

- https://bugzilla.redhat.com/show_bug.cgi?id=2292211 (CNA: redhat; issue-tracking, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2024:4392 (ADP: CVE; vendor-advisory, x_refsource_REDHAT, x_transferred)

- https://access.redhat.com/errata/RHSA-2024:4884 (ADP: CVE; vendor-advisory, x_refsource_REDHAT, x_transferred)

- https://access.redhat.com/security/cve/CVE-2024-5971 (ADP: CVE; vdb-entry, x_refsource_REDHAT, x_transferred)

- https://bugzilla.redhat.com/show_bug.cgi?id=2292211 (ADP: CVE; issue-tracking, x_refsource_REDHAT, x_transferred)

- https://security.netapp.com/advisory/ntap-20240828-0001/ (ADP: CVE)

## Provenance

- CNA: redhat: https://www.cve.org/CVERecord?id=CVE-2024-5971; retrieved 2026-11-07; source updated 2026-11-07

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2024-5971; retrieved 2026-11-07; source updated Not reported

Revision: 398edc54c09a7cbc037c542f41f8c44d99646b2c706061b6d93447f4ed6f71cc

Canonical: https://y2.dev/cve/CVE-2024-5971

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