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No exploitation reportedFix available

CVE-2021-3690

No exploitation reported by the sources we read.

  • Published2022-08-23
  • WeaknessCWE-400 · CWE-401

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2022-08-2316:15CVE publishedNVD

Versions per branch

NVD · OSV
Redhat jboss enterprise application platformversion to verify
BranchAffectedFixed in
—all versionsno fix published
7.3= 7.3no fix published
7.4= 7.4no fix published
Redhat undertow
BranchAffectedFixed in
2.x≥ 2.1.0, < 2.2.102.2.10
2.2≥ 2.2.0, < 2.2.102.2.10
2.0< 2.0.402.0.40
Redhat fuse
BranchAffectedFixed in
1.0= 1.0no fix published

4 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • eap7-activemq-artemisRed Hat:jboss_enterprise_application_platform_eus:7.1::el7all versions · fixed in 0:1.5.5.016-1.redhat_00001.1.ep7.el7and 15 other packages
  • eap7-apache-commons-ioRed Hat:jboss_enterprise_application_platform:7.4::el8all versions · fixed in 0:2.10.0-1.redhat_00001.1.el8eap
  • eap7-apache-commons-ioRed Hat:jboss_enterprise_application_platform:7.4::el7all versions · fixed in 0:2.10.0-1.redhat_00001.1.el7eap
  • eap7-apache-commons-ioRed Hat:jboss_enterprise_application_platform:7.3::el8all versions · fixed in 0:2.10.0-1.redhat_00001.1.el8eap
  • eap7-apache-commons-ioRed Hat:jboss_enterprise_application_platform:7.3::el7all versions · fixed in 0:2.10.0-1.redhat_00001.1.el7eap
  • eap7-apache-commons-ioRed Hat:jboss_enterprise_application_platform:7.3::el6all versions · fixed in 0:2.10.0-1.redhat_00001.1.el6eap
  • eap7-artemis-nativeRed Hat:jboss_enterprise_application_platform_eus:7.1::el7all versions · fixed in 1:1.5.5.016-1.redhat_00001.1.ep7.el7and 2 other packages
  • eap7-hal-consoleRed Hat:jboss_enterprise_application_platform:7.3::el8all versions · fixed in 0:3.2.16-1.Final_redhat_00001.1.el8eap

75 more package ranges on OSV.dev

Vendor advisories

  • CVE-2021-3690 Red Hat Product Security294 products fixed · 6 known affected

    undertow: buffer leak on incoming websocket PONG message may lead to DoS

    undertow as a component of Red Hat Integration Camel K 1 · undertow as a component of Red Hat Integration Camel Quarkus 1 · undertow as a component of Red Hat JBoss Data Grid 7 · +3 more

  • RHSA-2025:4226 Red Hat Product Security34 products fixed

    Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 7.1.10 on RHEL 7 security update

  • RHSA-2022:1029 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat Integration Camel-K 1.6.4 release and security update

  • RHSA-2021:5134 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat Fuse 7.10.0 release and security update

  • RHSA-2021:4767 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat Integration Camel Extensions for Quarkus GA security update

  • RHSA-2021:3660 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 7.4.1 security update

13 more advisories

Full record on NVD

Fix

  1. Vendor fix Red Hat Product Security RHSA-2025:4226 · 34 productsBefore applying this update, ensure all previously released errata relevant to your system have been applied. Also, back up your existing installation, including all applications, configuration files, databases and database settings. For details on how to apply this update, refer to: https://access…
  2. Vendor fix Red Hat Product Security RHSA-2022:1029 · 1 productBefore applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
  3. Vendor fix Red Hat Product Security RHSA-2021:5134 · 1 productBefore applying the update, back up your existing installation, including all applications, configuration files, databases and database settings, and so on. Installation instructions are available from the Fuse 7.10.0 product documentation page: https://access.redhat.com/documentation/en-us/red_ha…
  4. Vendor fix Red Hat Product Security RHSA-2021:4767 · 1 productBefore applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
  5. Vendor fix Red Hat Product Security RHSA-2021:3660 · 1 productBefore applying this update, back up your existing Red Hat JBoss Enterprise Application Platform installation and deployed applications. The References section of this erratum contains a download link (you must log in to download the update).
  6. Vendor fix Red Hat Product Security RHSA-2021:3658 · 2 productsBefore applying this update, ensure all previously released errata relevant to your system have been applied. For details about how to apply this update, see: https://access.redhat.com/articles/11258

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • NVDCVSS 3.17.5read 2026-10-23
  • CNAweakness (CWE)CWE-400known since 2026-10-23
  • NVDweakness (CWE)CWE-401read 2026-10-23
  • FIRST EPSSEPSS score1.8 %2026-11-08
  • OSVaffected packages—
  • GitHub AdvisoriesadvisoryHIGH2022-07-15

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2022-08-23
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-fj7c-vg2v-ccrm

Frequently asked questions

What is CVE-2021-3690?

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.

Is CVE-2021-3690 actively exploited?

Active exploitation of CVE-2021-3690 has not been confirmed. Its EPSS score was 1.8% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-3690?

CVE-2021-3690 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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