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CVE-2024-1635

Affected software9 products, listed below
Severity7.5 High CVSS 3.1
Fixed in2.3.12.Final, 2.2.31.Final
WeaknessUncontrolled resource consumption (CWE-400)
Published19 Feb 2024
Updated4 Nov 2026

Description

A vulnerability was found in Undertow. This vulnerability impacts a server that supports the wildfly-http-client protocol. Whenever a malicious user opens and closes a connection with the HTTP port of the server and then closes the connection immediately, the server will end with both memory and open file limits exhausted at some point, depending on the amount of memory available. At HTTP upgrade to remoting, the WriteTimeoutStreamSinkConduit leaks connections if RemotingConnection is closed by Remoting ServerConnectionOpenListener. Because the remoting connection originates in Undertow as part of the HTTP upgrade, there is an external layer to the remoting connection. This connection is unaware of the outermost layer when closing the connection during the connection opening procedure. Hence, the Undertow WriteTimeoutStreamSinkConduit is not notified of the closed connection in this scenario. Because WriteTimeoutStreamSinkConduit creates a timeout task, the whole dependency tree leaks via that task, which is added to XNIO WorkerThread. So, the workerThread points to the Undertow conduit, which contains the connections and causes the leak.

Exploitation status

No public exploit

No exploit has been reported in the sources we check. Published 2 years ago.

  • CISA KEV not listed
  • VulnCheck KEV not listed
  • CISA Vulnrichment exploitation: none
  • Indexed PoC none indexed
  • EPSS 4.6% chance in 30 days

Waratek protection

No exploit published

Within Waratek scope. In the sources we check, nobody has published exploit code for this CVE or reported it being exploited.

A public code fix exists: undertow-io/undertow 7d388c5.

  • Protection none
  • Action unverified
  • Review automated Upstream data
  • Record active
Decided by Exploit code for this candidate, published in a reviewed catalogue or a GitHub repository with 5 or more stars, or in use per CISA or VulnCheck; not only a CISA verdict, a forecast, or nothing at all
Finding This CVE is not listed in CISA KEV or VulnCheck KEV, CISA Vulnrichment records no active exploitation, no reviewed exploit catalogue carries an entry for it, and no GitHub PoC repository for it has 5 or more stars. Nobody has published exploit code worth tracing, so it is not a candidate for a rule ahead of the ones where somebody has; an upstream fix path does exist, so the remediation half of the candidacy still holds. This is a statement about what has been published, not about whether the defect is reachable or serious.
Candidate fix https://bugzilla.redhat.com/show_bug.cgi?id=2264928 : a Red Hat bug: the triage, which links onward to the fix

Affected software and releases

Oracle advisories

AdvisoryTypeQuarterProducts Oracle names in its risk matrix
Oracle Critical Patch Update April 2024 ↗ CPU 2024-Q2 Oracle Communications / Install/Upgrade (Undertow) (23.4.1)

Oracle components and versions

FamilyComponentVersions, as Oracle lists themRead as
Oracle Communications Install/Upgrade (Undertow) 23.4.1 23.4.1

Maven packages

Affected and fixed versions, from OSV.dev
PackageIntroducedFixedLast affected
io.undertow:undertow-core 2.3.0.Final 2.3.12.Final unbounded
io.undertow:undertow-core 0 2.2.31.Final unbounded

Products and versions

10 products, 15 version entries
SourceVendorProductSchemeAffected versions
osv io.undertow undertow-core generic < 2.2.31 · ≥ 2.3.0 and < 2.3.12
nvd netapp active iq unified manager generic any version
nvd netapp oncommand workflow automation generic any version
nvd redhat fuse generic 1.0
nvd redhat integration camel for spring boot generic any version
nvd redhat jboss enterprise application platform generic 7.4
nvd redhat openshift container platform generic 4.11 · 4.12
nvd redhat openshift container platform for linuxone generic 4.9 · 4.10
nvd redhat openshift container platform for power generic 4.9 · 4.10
nvd redhat single sign-on generic any version · 7.6

References

URLTags
https://bugzilla.redhat.com/show_bug.cgi?id=2264928 bugzilla
https://github.com/undertow-io/undertow/commit/7d388c5aae9b82afb63f24e3b6a2044838dfb4de WEB
https://github.com/undertow-io/undertow/commit/3cdb104e225f34547ce9fd6eb8799eb68e040f19 WEB
https://security.netapp.com/advisory/ntap-20240322-0007 WEB
https://github.com/undertow-io/undertow PACKAGE
https://access.redhat.com/security/cve/CVE-2024-1635 WEB
https://access.redhat.com/errata/RHSA-2025:4226 WEB
https://access.redhat.com/errata/RHSA-2024:4884 WEB
https://access.redhat.com/errata/RHSA-2024:3354 WEB
https://access.redhat.com/errata/RHSA-2024:1866 WEB

Timeline

Published2024-02-19By the CVE Program.
NVD record modified2026-11-04NVD's own last-modified date for this record.