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CVE-2023-5379 Undertow

Affected softwareUndertow
Severity7.5 High CVSS 3.1 2 scores
WeaknessCWE-770
Published12 Dec 2023
Updated5 Nov 2026

Description

A flaw was found in Undertow. When an AJP request is sent that exceeds the max-header-size attribute in ajp-listener, JBoss EAP is marked in an error state by mod_cluster in httpd, causing JBoss EAP to close the TCP connection without returning an AJP response. This happens because mod_proxy_cluster marks the JBoss EAP instance as an error worker when the TCP connection is closed from the backend after sending the AJP request without receiving an AJP response, and stops forwarding. This issue could allow a malicious user could to repeatedly send requests that exceed the max-header-size, causing a Denial of Service (DoS).

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 1.0% 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.

  • 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=2242099 : a Red Hat bug: the triage, which links onward to the fix

CVSS

7.5 HIGH v3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N 2 metrics

We show the highest score from the newest CVSS version. Scores from different versions can't be compared, and the first score listed is sometimes a 0.0 placeholder.

VersionScoreBandVectorAssignerType
CVSS 3.1 7.5 HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N secalert@redhat.com Secondary published
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 NVD Primary

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

Products and versions

3 products, 4 version entries
SourceVendorProductSchemeAffected versions
nvd redhat jboss enterprise application platform generic any version · 7.0.0
nvd redhat single sign-on generic 7.0
nvd redhat undertow generic any version

References

URLTags
https://bugzilla.redhat.com/show_bug.cgi?id=2242099 bugzilla
https://access.redhat.com/errata/RHSA-2025:9582
https://access.redhat.com/errata/RHSA-2025:9583
https://access.redhat.com/security/cve/CVE-2023-5379 Vendor Advisory
https://access.redhat.com/errata/RHSA-2023:4509 Vendor Advisory

Timeline

Published2023-12-12By the CVE Program.
NVD record modified2026-11-05NVD's own last-modified date for this record.