CVE-2021-3629

Name: CVE-2021-3629
Creator: NVD / NIST
Published: 2022-05-24T19:15:09.093+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.9/10EPSS 1.18%

Last modified Jun 17, 2026

CVE-2021-3629 is a medium-severity vulnerability rated 5.9/10 on the CVSS scale. 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. EPSS estimates a 1.18% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

5.9/10

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

1.18%

63.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Redhat	Integration	All versions
Redhat	Jboss Enterprise Application Platform	All versions
Redhat	Single Sign-On	All versions
Redhat	Undertow	< 2.0.40
Redhat	Undertow	>= 2.2.0, < 2.2.11
Redhat	Wildfly Core	< 17.0
Redhat	Jboss Enterprise Application Platform	7.4
Redhat	Jboss Enterprise Application Platform	7.3
Netapp	Active Iq Unified Manager	All versions
Netapp	Oncommand Insight	All versions
Netapp	Oncommand Workflow Automation	All versions

References

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

Timeline

Published: May 24, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-3629?

How severe is CVE-2021-3629?

CVE-2021-3629 has a CVSS score of 5.9/10 (MEDIUM severity). The EPSS model estimates a 1.18% probability of exploitation in the next 30 days.

How do I fix CVE-2021-3629?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-3629?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST