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CVE-2021-3597 undertow

Affected softwareundertow
Severity5.9 Medium CVSS 3.1 2 scores
Fixed in2.2.9.Final, 2.0.39.Final
WeaknessCWE-362
Published24 May 2022
Updated17 Jun 2026

Description

A flaw was found in undertow. The HTTP2SourceChannel fails to write the final frame under some circumstances, resulting in a denial of service. The highest threat from this vulnerability is availability. This flaw affects Undertow versions prior to 2.0.35.SP1, prior to 2.2.6.SP1, prior to 2.2.7.SP1, prior to 2.0.36.SP1, prior to 2.2.9.Final and prior to 2.0.39.Final.

Exploitation status

No public exploit

No exploit has been reported in the sources we check. Published 4 years ago.

  • CISA KEV not listed
  • VulnCheck KEV not listed
  • CISA Vulnrichment no assessment published
  • Indexed PoC none indexed
  • EPSS 1.2% 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=1970930 : a Red Hat bug: the triage, which links onward to the fix

CVSS

5.9 MEDIUM v3.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H 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 5.9 MEDIUM CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H NVD Primary published
CVSS 2.0 2.6 none AV:N/AC:H/Au:N/C:N/I:N/A:P NVD Primary

Affected software and releases

Oracle advisories

AdvisoryTypeQuarterProducts Oracle names in its risk matrix
Oracle Critical Patch Update October 2022 ↗ CPU 2022-Q4 Oracle Communications / Signaling (undertow) (22.3.0)
Oracle Communications / Signaling (undertow) (22.3.0)

Oracle components and versions

FamilyComponentVersions, as Oracle lists themRead as
Oracle Communications Signaling (undertow) 22.3.0 22.3.0

Maven packages

Affected and fixed versions, from OSV.dev
PackageIntroducedFixedLast affected
io.undertow:undertow-core 2.1.0 2.2.9.Final unbounded
io.undertow:undertow-core 0 2.0.39.Final unbounded

Products and versions

9 products, 19 version entries
SourceVendorProductSchemeAffected versions
osv io.undertow undertow-core generic < 2.0.39 · ≥ 2.1.0 and < 2.2.9
nvd netapp active iq unified manager generic any version
nvd netapp oncommand insight generic any version
nvd netapp oncommand workflow automation generic any version
nvd redhat fuse generic 1.0
nvd redhat jboss enterprise application platform generic any version · 7.3 · 7.4
nvd redhat openshift application runtimes generic any version
nvd redhat single sign-on generic any version
nvd redhat undertow generic 2.0.35 · < 2.0.35 · 2.0.36 · 2.0.39 · ≥ 2.2.0 and < 2.2.6 · 2.2.6 · 2.2.7 · 2.2.9

References

URLTags
https://bugzilla.redhat.com/show_bug.cgi?id=1970930 bugzilla
https://github.com/undertow-io/undertow PACKAGE
https://security.netapp.com/advisory/ntap-20220804-0003 WEB
https://security.netapp.com/advisory/ntap-20220804-0003/ Third Party Advisory

Timeline

Published2022-05-24By the CVE Program.
NVD record modified2026-06-17NVD's own last-modified date for this record.