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Fencer Vulns
medium 6.3

CVE-2024-23672 json

Apache Tomcat: WebSocket DoS with incomplete closing handshake

published 2024-03-13 2 y ago modified 2026-09-08 2 mo ago also BIT-tomcat-2024-23672 , EUVD-2024-1010 , GHSA-v682-8vv8-vpwr

cvss
6.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
2.3%
EPSS 2.3% chance of exploitation in 30 days, percentile 83%
public exploits
0
none known

Summary

Denial of Service via incomplete cleanup vulnerability in Apache Tomcat. It was possible for WebSocket clients to keep WebSocket connections open leading to increased resource consumption.This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.0-M16, from 10.1.0-M1 through 10.1.18, from 9.0.0-M1 through 9.0.85, from 8.5.0 through 8.5.98.

Older, EOL versions may also be affected.

Users are recommended to upgrade to version 11.0.0-M17, 10.1.19, 9.0.86 or 8.5.99 which fix the issue.

Patch / fix

  • maven org.apache.tomcat:tomcat-websocket 8.5.99, 9.0.86, 10.1.19, 11.0.0-M17
  • maven org.apache.tomcat.embed:tomcat-embed-websocket 8.5.99, 9.0.86, 10.1.19, 11.0.0-M17
  • bitnami tomcat 8.5.99, 9.0.86, 10.1.19
  • apache tomcat-embed-websocket 8.5.99, 9.0.86, 10.1.19, 11.0.0-M17
  • org.apache.tomcat.embed tomcat-embed-websocket 8.5.99, 9.0.86, 10.1.19, 11.0.0-M17
  • apache tomcat-websocket 8.5.99, 9.0.86, 10.1.19, 11.0.0-M17
  • apache tomcat 8.5.99, 9.0.86, 10.1.19, 11.0.0-M17
  • org.apache.tomcat tomcat-websocket 8.5.99, 9.0.86, 10.1.19, 11.0.0-M17
  • tomcat9 Debian 14, Debian 13, Debian 12 9.0.70-2
  • tomcat10 Debian 12 10.1.6-1+deb12u2
  • tomcat10 Debian 14, Debian 13 10.1.20-1

debian advisories DEBIAN-CVE-2024-23672

  • tomcat9 Ubuntu 20.04 LTS 9.0.31-1ubuntu0.8
  • tomcat9 Ubuntu 25.10 9.0.70-2ubuntu3
  • tomcat8 Ubuntu Pro 18.04 LTS 8.5.39-1ubuntu1~18.04.3+esm5
  • tomcat9 Ubuntu Pro 18.04 LTS 9.0.16-3ubuntu0.18.04.2+esm4
  • tomcat9 Ubuntu Pro 22.04 LTS 9.0.58-1ubuntu0.1+esm4
  • tomcat9 Ubuntu Pro 24.04 LTS 9.0.70-2ubuntu0.1+esm2
  • tomcat10 Ubuntu Pro 24.04 LTS 10.1.16-1ubuntu0.1~esm2

ubuntu advisories UBUNTU-CVE-2024-23672

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • tomcat RHEL 10.0 1:10.1.36-1.el10_0
  • tomcat-lib RHEL 10.0 1:10.1.36-1.el10_0
  • tomcat-webapps RHEL 10.0 1:10.1.36-1.el10_0
  • tomcat-el-5.0-api RHEL 10.0 1:10.1.36-1.el10_0
  • tomcat-docs-webapp RHEL 10.0 1:10.1.36-1.el10_0
  • tomcat-jsp-3.1-api RHEL 10.0 1:10.1.36-1.el10_0
  • tomcat-admin-webapps RHEL 10.0 1:10.1.36-1.el10_0
  • tomcat-servlet-6.0-api RHEL 10.0 1:10.1.36-1.el10_0

red hat advisories RHSA-2025:7497RHSA-2024:3814RHSA-2024:3666RHSA-2024:3307RHSA-2024:3308RHSA-2024:1916

  • tomcat SLES for SAP 15 SP4, SLES for SAP 15 SP3, SLES for SAP 15 SP2 +11 more 9.0.87-150200.65.1
  • geronimo-specs SLES for SAP 15 SP4, SLES for SAP 15 SP3, SLES for SAP 15 SP2 +14 more 1.2-150200.15.8.1
  • apache-commons-dbcp SLES for SAP 15 SP4, SLES for SAP 15 SP3, SLES for SAP 15 SP2 +11 more 2.1.1-150200.10.8.1
  • apache-commons-pool2 SLES for SAP 15 SP4, SLES for SAP 15 SP3, SLES for SAP 15 SP2 +11 more 2.4.2-150200.11.8.1
  • apache-commons-daemon SLES for SAP 15 SP4, SLES for SAP 15 SP3, SLES for SAP 15 SP2 +11 more 1.3.4-150200.11.14.1
  • jakarta-taglibs-standard SLES for SAP 15 SP4, SLES for SAP 15 SP3, SLES for SAP 15 SP2 +11 more 1.1.1-150000.4.10.1
  • tomcat SLES for SAP 12 SP5, SLES 12 SP5 9.0.36-3.124.1
  • tomcat10 SLE Module for Web and Scripting 15 SP5, openSUSE Leap 15.5 10.1.20-150200.5.22.2

suse advisories SUSE-SU-2026:1058-1SUSE-SU-2024:1345-1SUSE-SU-2024:1205-1SUSE-SU-2024:1204-1

  • tomcat openSUSE Tumbleweed 9.0.87-1.1
  • tomcat10 openSUSE Tumbleweed 10.1.20-1.1

opensuse advisories openSUSE-SU-2024:13832-1openSUSE-SU-2024:13833-1

  • tomcat AlmaLinux 8 1:9.0.87-1.el8_10.1.alma.1
  • tomcat-lib AlmaLinux 8 1:9.0.87-1.el8_10.1.alma.1
  • tomcat-webapps AlmaLinux 8 1:9.0.87-1.el8_10.1.alma.1
  • tomcat-el-3.0-api AlmaLinux 8 1:9.0.87-1.el8_10.1.alma.1
  • tomcat-docs-webapp AlmaLinux 8 1:9.0.87-1.el8_10.1.alma.1
  • tomcat-jsp-2.3-api AlmaLinux 8 1:9.0.87-1.el8_10.1.alma.1
  • tomcat-admin-webapps AlmaLinux 8 1:9.0.87-1.el8_10.1.alma.1
  • tomcat-servlet-4.0-api AlmaLinux 8 1:9.0.87-1.el8_10.1.alma.1

almalinux advisories ALSA-2024:3666ALSA-2024:3307

  • tomcat Rocky Linux 9 1:9.0.87-1.el9_4.1
  • tomcat Rocky Linux 8 1:9.0.87-1.el8_10.1

rocky linux advisories RLSA-2024:3307RLSA-2024:3666

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2024-23672 updated cvss 7.5

Tomcat: WebSocket DoS with incomplete closing handshake

  • Red Hat Enterprise Linux 6 tomcat6, tomcat6-lib, tomcat6-log4j, tomcat6-javadoc, tomcat6-webapps, tomcat6-el-2.1-api, +4 more
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 8 pki-servlet-engine, pki-servlet-4.0-api Red Hat Enterprise Linux 9 pki-servlet-engine, pki-servlet-4.0-api
    affected: workaround, no fix planned “Will not fix”
  • Red Hat Enterprise Linux AppStream (v. 8) tomcat 9.0.87-1.el8_10.1, tomcat-lib 9.0.87-1.el8_10.1, tomcat-webapps 9.0.87-1.el8_10.1, tomcat-el-3.0-api 9.0.87-1.el8_10.1, tomcat-docs-webapp 9.0.87-1.el8_10.1, tomcat-jsp-2.3-api 9.0.87-1.el8_10.1, +2 more
    fixed: vendor fix RHSA-2024:3666
  • Red Hat Enterprise Linux AppStream (v. 9) tomcat 9.0.87-1.el9_4.1, tomcat-lib 9.0.87-1.el9_4.1, tomcat-webapps 9.0.87-1.el9_4.1, tomcat-el-3.0-api 9.0.87-1.el9_4.1, tomcat-docs-webapp 9.0.87-1.el9_4.1, tomcat-jsp-2.3-api 9.0.87-1.el9_4.1, +2 more
    fixed: vendor fix RHSA-2024:3307
  • Red Hat Enterprise Linux AppStream (v. 10) tomcat 10.1.36-1.el10_0, tomcat-lib 10.1.36-1.el10_0, tomcat-webapps 10.1.36-1.el10_0, tomcat-el-5.0-api 10.1.36-1.el10_0, tomcat-docs-webapp 10.1.36-1.el10_0, tomcat-jsp-3.1-api 10.1.36-1.el10_0, +2 more
    fixed: vendor fix RHSA-2025:7497
  • Red Hat Enterprise Linux AppStream EUS (v.8.8) tomcat 9.0.87-1.el8_8.2, tomcat-lib 9.0.87-1.el8_8.2, tomcat-webapps 9.0.87-1.el8_8.2, tomcat-el-3.0-api 9.0.87-1.el8_8.2, tomcat-docs-webapp 9.0.87-1.el8_8.2, tomcat-jsp-2.3-api 9.0.87-1.el8_8.2, +2 more
    fixed: vendor fix RHSA-2024:3814
  • Red Hat Enterprise Linux AppStream EUS (v.9.2) tomcat 9.0.87-1.el9_2.1, tomcat-lib 9.0.87-1.el9_2.1, tomcat-webapps 9.0.87-1.el9_2.1, tomcat-el-3.0-api 9.0.87-1.el9_2.1, tomcat-docs-webapp 9.0.87-1.el9_2.1, tomcat-jsp-2.3-api 9.0.87-1.el9_2.1, +2 more
    fixed: vendor fix RHSA-2024:3308
  • Red Hat JBoss Web Server 5
    fixed: vendor fix RHSA-2024:1914
show 4 more
  • Red Hat JBoss Web Server 5.8 for RHEL 7 Server jws5-tomcat 9.0.87-3.redhat_00003.1.el7jws, jws5-tomcat-lib 9.0.87-3.redhat_00003.1.el7jws, jws5-tomcat-javadoc 9.0.87-3.redhat_00003.1.el7jws, jws5-tomcat-selinux 9.0.87-3.redhat_00003.1.el7jws, jws5-tomcat-webapps 9.0.87-3.redhat_00003.1.el7jws, jws5-tomcat-java-jdk8 9.0.87-3.redhat_00003.1.el7jws, +6 more Red Hat JBoss Web Server 5.8 for RHEL 8 jws5-tomcat 9.0.87-3.redhat_00003.1.el8jws, jws5-tomcat-lib 9.0.87-3.redhat_00003.1.el8jws, jws5-tomcat-javadoc 9.0.87-3.redhat_00003.1.el8jws, jws5-tomcat-selinux 9.0.87-3.redhat_00003.1.el8jws, jws5-tomcat-webapps 9.0.87-3.redhat_00003.1.el8jws, jws5-tomcat-el-3.0-api 9.0.87-3.redhat_00003.1.el8jws, +4 more Red Hat JBoss Web Server 5.8 for RHEL 9 jws5-tomcat 9.0.87-3.redhat_00003.1.el9jws, jws5-tomcat-lib 9.0.87-3.redhat_00003.1.el9jws, jws5-tomcat-javadoc 9.0.87-3.redhat_00003.1.el9jws, jws5-tomcat-selinux 9.0.87-3.redhat_00003.1.el9jws, jws5-tomcat-webapps 9.0.87-3.redhat_00003.1.el9jws, jws5-tomcat-el-3.0-api 9.0.87-3.redhat_00003.1.el9jws, +4 more
    fixed: vendor fix RHSA-2024:1913
  • Red Hat JBoss Web Server 6
    fixed: vendor fix RHSA-2024:1917
  • Red Hat JBoss Web Server 6.0 for RHEL 8 jws6-tomcat 10.1.8-7.redhat_00014.1.el8jws, jws6-tomcat-lib 10.1.8-7.redhat_00014.1.el8jws, jws6-tomcat-javadoc 10.1.8-7.redhat_00014.1.el8jws, jws6-tomcat-selinux 10.1.8-7.redhat_00014.1.el8jws, jws6-tomcat-webapps 10.1.8-7.redhat_00014.1.el8jws, jws6-tomcat-el-5.0-api 10.1.8-7.redhat_00014.1.el8jws, +4 more Red Hat JBoss Web Server 6.0 for RHEL 9 jws6-tomcat 10.1.8-7.redhat_00014.1.el9jws, jws6-tomcat-lib 10.1.8-7.redhat_00014.1.el9jws, jws6-tomcat-javadoc 10.1.8-7.redhat_00014.1.el9jws, jws6-tomcat-selinux 10.1.8-7.redhat_00014.1.el9jws, jws6-tomcat-webapps 10.1.8-7.redhat_00014.1.el9jws, jws6-tomcat-el-5.0-api 10.1.8-7.redhat_00014.1.el9jws, +4 more
    fixed: vendor fix RHSA-2024:1916
  • Red Hat Enterprise Linux 7 tomcat, tomcat-lib, tomcat-jsvc, tomcat-javadoc, tomcat-webapps, tomcat-el-2.2-api, +4 more Red Hat JBoss Web Server 5.8 for RHEL 7 Server jws5-mod_cluster 1.4.5-1.Final_redhat_00001.1.el7jws, jws5-mod_cluster-tomcat 1.4.5-1.Final_redhat_00001.1.el7jws Red Hat JBoss Web Server 5.8 for RHEL 8 jws5-mod_cluster 1.4.5-1.Final_redhat_00001.1.el8jws, jws5-mod_cluster-tomcat 1.4.5-1.Final_redhat_00001.1.el8jws Red Hat JBoss Web Server 5.8 for RHEL 9 jws5-mod_cluster 1.4.5-1.Final_redhat_00001.1.el9jws, jws5-mod_cluster-tomcat 1.4.5-1.Final_redhat_00001.1.el9jws Red Hat JBoss Web Server 6.0 for RHEL 8 jws6-mod_cluster 2.0.4-1.Final_redhat_00001.1.el8jws, jws6-mod_cluster-tomcat 2.0.4-1.Final_redhat_00001.1.el8jws Red Hat JBoss Web Server 6.0 for RHEL 9 jws6-mod_cluster 2.0.4-1.Final_redhat_00001.1.el9jws, jws6-mod_cluster-tomcat 2.0.4-1.Final_redhat_00001.1.el9jws
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2 y ago

Exploit prediction

2.31% chance of exploitation in the next 30 days, higher than 83% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 6.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
GitHub 3.1 6.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
CNA 3.1 6.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
OSV 3.1 6.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

Affected packages

ecosystem package affected fixed in
maven org.apache.tomcat:tomcat-websocket
>=11.0.0-M1, <11.0.0-M17
>=10.1.0-M1, <10.1.19
>=9.0.0-M1, <9.0.86
>=8.5.0, <8.5.99
11.0.0-M17
10.1.19
9.0.86
8.5.99
maven org.apache.tomcat.embed:tomcat-embed-websocket
>=11.0.0-M1, <11.0.0-M17
>=10.1.0-M1, <10.1.19
>=9.0.0-M1, <9.0.86
>=8.5.0, <8.5.99
11.0.0-M17
10.1.19
9.0.86
8.5.99
bitnami tomcat
>=8.5.0, <8.5.99
>=9.0.0, <9.0.86
>=10.0.0, <10.1.19
8.5.99
9.0.86
10.1.19

Affected products

  • Apache Software Foundation Apache Tomcat

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.