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CVE-2021-3690 Undertow

Affected softwareUndertow
Severity7.5 High CVSS 3.1
Fixed in2.0.40, 2.2.10
WeaknessUncontrolled resource consumption (CWE-400)
Published23 Aug 2022
Updated17 Jun 2026

Description

A flaw was found in Undertow. A buffer leak on the incoming WebSocket PONG message may lead to memory exhaustion. This flaw allows an attacker to cause a denial of service. The highest threat from this vulnerability is availability.

CWE-401

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 1.9% 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 c7e84a0.

  • 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://github.com/undertow-io/undertow/commit/c7e84a0b7efced38506d7d1dfea5902366973877 : a commit: the change itself

Affected software and releases

Oracle advisories

AdvisoryTypeQuarterProducts Oracle names in its risk matrix
Oracle Critical Patch Update April 2022 ↗ CPU 2022-Q2 Oracle Communications / NSSF (Undertow) (1.8.0)

Oracle components and versions

FamilyComponentVersions, as Oracle lists themRead as
Oracle Communications NSSF (Undertow) 1.8.0 1.8.0

Maven packages

Affected and fixed versions, from OSV.dev
PackageIntroducedFixedLast affected
io.undertow:undertow-core 0 2.0.40 unbounded
io.undertow:undertow-core 2.2.0 2.2.10 unbounded

Products and versions

8 products, 12 version entries
SourceVendorProductSchemeAffected versions
osv io.undertow undertow-core generic < 2.0.40 · ≥ 2.2.0 and < 2.2.10
nvd redhat fuse generic 1.0
nvd redhat integration camel k generic any version
nvd redhat integration camel quarkus generic any version
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 < 2.0.40 · ≥ 2.1.0 and < 2.2.10

References

URLTags
https://github.com/undertow-io/undertow/commit/c7e84a0b7efced38506d7d1dfea5902366973877 commit
https://access.redhat.com/security/cve/CVE-2021-3690 WEB
https://access.redhat.com/security/cve/cve-2021-3690#cve-cvss-v3 WEB
https://bugzilla.redhat.com/show_bug.cgi?id=1991299 WEB
https://github.com/undertow-io/undertow PACKAGE
https://issues.redhat.com/browse/UNDERTOW-1935 WEB
https://www.mend.io/vulnerability-database/CVE-2021-3690 WEB

Timeline

Published2022-08-23By the CVE Program.
NVD record modified2026-06-17NVD's own last-modified date for this record.