Home/CVE/A flaw was found in Undertow. A potential security issue in flow control handling by the browser over http/2 may potenti
CVE

CVE-2021-3629

A flaw was found in Undertow. A potential security issue in flow control handling by the browser over http/2 may potenti

A flaw was found in Undertow. A potential security issue in flow control handling by the browser over http/2 may potentially cause overhead or a denial of service in the server. The highest threat from this vulnerability is availability.

This flaw affects Undertow versions prior to 2.0.40.Final and prior to 2.2.11.Final.

MEDIUM · CVSS 5.9 EPSS 0.00293
Monitor
  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-400Uncontrolled Resource Consumption
CWE-400Uncontrolled Resource Consumption
▤

Affected Products & Versions

9
redhat integrationall versions
redhat jboss enterprise application platformall versions
redhat single sign-onall versions
redhat undertow< 2.0.40
redhat undertow>= 2.2.0 and < 2.2.11
redhat wildfly core< 17.0
netapp active iq unified managerall versions
netapp oncommand insightall versions
▤

Affected Packages

1
Language-ecosystem packages (from OSV) tied to this CVE, with the version that fixes it - the dependency-level detail NVD doesn’t carry.
Maven io.undertow:undertow-core HIGH fixed in 2.0.40.Final
▣

Scoring & Timeline

5.9
MEDIUM · CVSS v3.1 · secalert@redhat.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD24 May 2022 · 07:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
⚑

Vendor Advisories

22
rhsaRHSA-2025:9583Important
rhsaRHSA-2025:9582Moderate
rhsaRHSA-2022:6825Important
rhsaRHSA-2022:6823Important
rhsaRHSA-2022:6821Important
🔗

References & Sources

2
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://bugzilla.redhat.com/show_bug.cgi?id=1977362Issue TrackingThird Party Advisory
https://security.netapp.com/advisory/ntap-20220729-0008/Third Party Advisory
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