CVE-2021-3629

18

FAUCET Score

CVE-2021-3629 is a medium-severity flaw in Undertow, affecting versions prior to 2.0.40.Final and 2.2.11.Final, and impacting products from NetApp and Red Hat. This vulnerability involves a potential security issue in HTTP/2 flow control handling, which could lead to server overhead or a denial of service. With a CVSS score of 5.9, it has a network attack vector and high attack complexity, primarily threatening system availability. There is no evidence of active exploitation, no known public exploit code (Metasploit, Nuclei, ExploitDB), and minimal community discussion or media coverage.

Impacted Technologies

Vendor	Product	Version(s)	CPE
		Range not provided by sourceCPE matchmatch criteria	cpe:2.3:a:redhat:integration:-::::text-only:::
		Range not provided by sourceCPE matchmatch criteria	cpe:2.3:a:redhat:jboss_enterprise_application_platform:-::::text-only:::
		Range not provided by sourceCPE matchmatch criteria	cpe:2.3:a:redhat:single_sign-on:-::::text-only:::
		< 2.0.40CPE matchmatch criteria	cpe:2.3:a:redhat:undertow::::::::
		>= 2.2.0, < 2.2.11CPE matchmatch criteria	cpe:2.3:a:redhat:undertow::::::::

CVSS Data

CVSS version used by this source: 3.1

5.9MEDIUM

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

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

Exploitability Score

2.2

Impact Score

3.6

CvssVersion

3.1

Exploit Intelligence

EPSS Score

1.16%

Probability of exploitation in next 30 days

EPSS Percentile

64.0%

Percentile rank of EPSS score among Peer Group

As of 2026-07-25

Model: v2026.06.15

This CVE's current EPSS score of 0.0116 is in the 28th percentile among its peer group of 19,955 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (51)

mavenpatch availablevia ghsa

Product: io.undertow:undertow-coreFixed in: 2.0.40.Final

mavenpatch availablevia ghsa

Product: io.undertow:undertow-coreFixed in: 2.2.11.Final

redhatpatch availablevia redhat_api

Product: EAP 7.3.10 GAFixed in: undertow

redhatpatch availablevia redhat_api

Product: Red Hat EAP-XP 2 via EAP 7.3.x baseFixed in: undertow

redhatpatch availablevia redhat_api

Product: Red Hat Fuse 7.10Fixed in: undertow

redhatpatch availablevia redhat_api

Product: Red Hat Fuse 7.11

redhatpatch availablevia redhat_api

Product: Red Hat Integration Camel Quarkus 2

redhatpatch availablevia redhat_api

Product: Red Hat JBoss Enterprise Application Platform 7Fixed in: undertow

redhatpatch availablevia redhat_api

Product: Red Hat JBoss Enterprise Application Platform 7.3 for RHEL 6Fixed in: eap7-apache-cxf-0:3.3.12-1.redhat_00001.1.el6eap

redhatpatch availablevia redhat_api

Product: Red Hat JBoss Enterprise Application Platform 7.3 for RHEL 6Fixed in: eap7-ironjacamar-0:1.5.3-1.Final_redhat_00001.1.el6eap

redhatpatch availablevia redhat_api

Product: Red Hat JBoss Enterprise Application Platform 7.3 for RHEL 6Fixed in: eap7-jakarta-el-0:3.0.3-3.redhat_00007.1.el6eap

redhatpatch availablevia redhat_api

Product: Red Hat JBoss Enterprise Application Platform 7.3 for RHEL 6Fixed in: eap7-jboss-ejb-client-0:4.0.43-1.Final_redhat_00001.1.el6eap

redhatpatch availablevia redhat_api

Product: Red Hat JBoss Enterprise Application Platform 7.3 for RHEL 6Fixed in: eap7-jboss-server-migration-0:1.7.2-10.Final_redhat_00011.1.el6eap

redhatpatch availablevia redhat_api

Product: Red Hat JBoss Enterprise Application Platform 7.3 for RHEL 6Fixed in: eap7-jsoup-0:1.14.2-1.redhat_00002.1.el6eap

redhatpatch availablevia redhat_api

Product: Red Hat JBoss Enterprise Application Platform 7.3 for RHEL 6Fixed in: eap7-resteasy-0:3.11.5-1.Final_redhat_00001.1.el6eap

redhatpatch availablevia redhat_api

Product: Red Hat JBoss Enterprise Application Platform 7.3 for RHEL 6Fixed in: eap7-undertow-0:2.0.41-1.SP1_redhat_00001.1.el6eap

redhatpatch availablevia redhat_api

Product: Red Hat JBoss Enterprise Application Platform 7.3 for RHEL 6Fixed in: eap7-wildfly-0:7.3.10-2.GA_redhat_00003.1.el6eap

redhatpatch availablevia redhat_api

Product: Red Hat JBoss Enterprise Application Platform 7.3 for RHEL 6Fixed in: eap7-wildfly-elytron-0:1.10.15-1.Final_redhat_00001.1.el6eap

redhatpatch availablevia redhat_api

Product: Red Hat JBoss Enterprise Application Platform 7.3 for RHEL 6Fixed in: eap7-wss4j-0:2.2.7-1.redhat_00001.1.el6eap

redhatpatch availablevia redhat_api

Product: Red Hat JBoss Enterprise Application Platform 7.3 for RHEL 6Fixed in: eap7-xml-security-0:2.1.7-1.redhat_00001.1.el6eap

redhatpatch availablevia redhat_api

Product: Red Hat JBoss Enterprise Application Platform 7.3 for RHEL 7Fixed in: eap7-apache-cxf-0:3.3.12-1.redhat_00001.1.el7eap

redhatpatch availablevia redhat_api

Product: Red Hat JBoss Enterprise Application Platform 7.3 for RHEL 7Fixed in: eap7-ironjacamar-0:1.5.3-1.Final_redhat_00001.1.el7eap

redhatpatch availablevia redhat_api

Product: Red Hat JBoss Enterprise Application Platform 7.3 for RHEL 7Fixed in: eap7-jakarta-el-0:3.0.3-3.redhat_00007.1.el7eap

redhatpatch availablevia redhat_api

Product: Red Hat JBoss Enterprise Application Platform 7.3 for RHEL 7Fixed in: eap7-jboss-ejb-client-0:4.0.43-1.Final_redhat_00001.1.el7eap

redhatpatch availablevia redhat_api

Product: Red Hat JBoss Enterprise Application Platform 7.3 for RHEL 7Fixed in: eap7-jboss-server-migration-0:1.7.2-10.Final_redhat_00011.1.el7eap

redhatpatch availablevia redhat_api

Product: Red Hat JBoss Enterprise Application Platform 7.3 for RHEL 7Fixed in: eap7-jsoup-0:1.14.2-1.redhat_00002.1.el7eap

redhatpatch availablevia redhat_api

Product: Red Hat JBoss Enterprise Application Platform 7.3 for RHEL 7Fixed in: eap7-resteasy-0:3.11.5-1.Final_redhat_00001.1.el7eap

redhatpatch availablevia redhat_api

Product: Red Hat JBoss Enterprise Application Platform 7.3 for RHEL 7Fixed in: eap7-undertow-0:2.0.41-1.SP1_redhat_00001.1.el7eap

redhatpatch availablevia redhat_api

Product: Red Hat JBoss Enterprise Application Platform 7.3 for RHEL 7Fixed in: eap7-wildfly-0:7.3.10-2.GA_redhat_00003.1.el7eap

redhatpatch availablevia redhat_api

Product: Red Hat JBoss Enterprise Application Platform 7.3 for RHEL 7Fixed in: eap7-wildfly-elytron-0:1.10.15-1.Final_redhat_00001.1.el7eap

redhatpatch availablevia redhat_api

Product: Red Hat JBoss Enterprise Application Platform 7.3 for RHEL 7Fixed in: eap7-wss4j-0:2.2.7-1.redhat_00001.1.el7eap

redhatpatch availablevia redhat_api

Product: Red Hat JBoss Enterprise Application Platform 7.3 for RHEL 7Fixed in: eap7-xml-security-0:2.1.7-1.redhat_00001.1.el7eap

redhatpatch availablevia redhat_api

Product: Red Hat JBoss Enterprise Application Platform 7.3 for RHEL 8Fixed in: eap7-apache-cxf-0:3.3.12-1.redhat_00001.1.el8eap

redhatpatch availablevia redhat_api

Product: Red Hat JBoss Enterprise Application Platform 7.3 for RHEL 8Fixed in: eap7-ironjacamar-0:1.5.3-1.Final_redhat_00001.1.el8eap

redhatpatch availablevia redhat_api

Product: Red Hat JBoss Enterprise Application Platform 7.3 for RHEL 8Fixed in: eap7-jakarta-el-0:3.0.3-3.redhat_00007.1.el8eap

redhatpatch availablevia redhat_api

Product: Red Hat JBoss Enterprise Application Platform 7.3 for RHEL 8Fixed in: eap7-jboss-ejb-client-0:4.0.43-1.Final_redhat_00001.1.el8eap

redhatpatch availablevia redhat_api

Product: Red Hat JBoss Enterprise Application Platform 7.3 for RHEL 8Fixed in: eap7-jboss-server-migration-0:1.7.2-10.Final_redhat_00011.1.el8eap

redhatpatch availablevia redhat_api

Product: Red Hat JBoss Enterprise Application Platform 7.3 for RHEL 8Fixed in: eap7-jsoup-0:1.14.2-1.redhat_00002.1.el8eap

redhatpatch availablevia redhat_api

Product: Red Hat JBoss Enterprise Application Platform 7.3 for RHEL 8Fixed in: eap7-resteasy-0:3.11.5-1.Final_redhat_00001.1.el8eap

redhatpatch availablevia redhat_api

Product: Red Hat JBoss Enterprise Application Platform 7.3 for RHEL 8Fixed in: eap7-undertow-0:2.0.41-1.SP1_redhat_00001.1.el8eap

redhatpatch availablevia redhat_api

Product: Red Hat JBoss Enterprise Application Platform 7.3 for RHEL 8Fixed in: eap7-wildfly-0:7.3.10-2.GA_redhat_00003.1.el8eap

redhatpatch availablevia redhat_api

Product: Red Hat JBoss Enterprise Application Platform 7.3 for RHEL 8Fixed in: eap7-wildfly-elytron-0:1.10.15-1.Final_redhat_00001.1.el8eap

redhatpatch availablevia redhat_api

Product: Red Hat JBoss Enterprise Application Platform 7.3 for RHEL 8Fixed in: eap7-wss4j-0:2.2.7-1.redhat_00001.1.el8eap

redhatpatch availablevia redhat_api

Product: Red Hat JBoss Enterprise Application Platform 7.3 for RHEL 8Fixed in: eap7-xml-security-0:2.1.7-1.redhat_00001.1.el8eap

redhatpatch availablevia redhat_api

Product: Red Hat JBoss Enterprise Application Platform 7.4 for RHEL 8Fixed in: eap7-undertow-0:2.2.12-2.Final_redhat_00001.1.el8eap

redhatpatch availablevia redhat_api

Product: Red Hat JBoss Enterprise Application Platform 7.4 on RHEL 7Fixed in: eap7-undertow-0:2.2.12-2.Final_redhat_00001.1.el7eap

redhatpatch availablevia redhat_api

Product: Red Hat Single Sign-On 7.4.10Fixed in: undertow

redhatpatch availablevia redhat_api

Product: Red Hat Support for Spring Boot 2.5.10Fixed in: undertow

redhatpatch availablevia redhat_api

Product: RHAF Camel-K 1.8Fixed in: undertow

redhatno patchvia redhat_api

Product: Red Hat Integration Camel K 1Fixed in: undertow

redhatno patchvia redhat_api

Product: Red Hat support for Spring BootFixed in: undertow

Vendor Advisories (2)

mavenGHSA-rf6q-vx79-mjxrhigh

Undertow Uncontrolled Resource Consumption

redhatCVE-2021-3629Moderate

undertow: potential security issue in flow control over HTTP/2 may lead to DOS

References

bugzilla.redhat.com / show_bug.cgi

Issue TrackingThird Party Advisory

security.netapp.com / advisory/ntap-20220729-0008

Third Party Advisory