HOMEVULNERABILITIESCVE-2021-3629
MEDIUM

CVE-2021-3629

CWE-400Published: May 24, 2022· Updated: Jun 17, 2026

5.9
CVSS v3.1

Official Description

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.

NVD Source

Technical Analysis

CVE-2021-3629 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 5.9.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityHigh
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Vendors & Products

netapp3 product(s)
active iq unified manageroncommand insightoncommand workflow automation
Red Hat6 product(s)
integrationjboss enterprise application platformsingle sign-onundertowwildfly coreenterprise linux
Source: NVD CPE · 13 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://bugzilla.redhat.com/show_bug.cgi?id=1977362
ADVISORYhttps://security.netapp.com/advisory/ntap-20220729-0008/
ADVISORYhttps://bugzilla.redhat.com/show_bug.cgi?id=1977362
ADVISORYhttps://security.netapp.com/advisory/ntap-20220729-0008/

All References (4)

→
https://bugzilla.redhat.com/show_bug.cgi?id=1977362Issue Tracking · Third Party Advisory
→
https://security.netapp.com/advisory/ntap-20220729-0008/Third Party Advisory
→
https://bugzilla.redhat.com/show_bug.cgi?id=1977362Issue Tracking · Third Party Advisory
→
https://security.netapp.com/advisory/ntap-20220729-0008/Third Party Advisory

Quick Facts

CVE IDCVE-2021-3629
CVSS Score5.9 / 10
SeverityMEDIUM
WeaknessCWE-400
CISA KEVNo
Affected2 vendor(s)
PublishedMay 24, 2022

Related CVEs (CWE-400)

CVE-2019-10952
9.8
CVE-2015-4412
9.8
CVE-2025-61303
9.8
CVE-2025-43193
9.8
CVE-2026-30141
9.8
CVE-2019-2259
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-3629 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.
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