Apache Tomcat: WebSocket DoS with incomplete closing handshake
Priority LOW 33CWE-459Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- Low · Low · Low
- Fix status
- Partial Red Hat: 12 fixed, 3 without a fix
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA, GitHub and Red Hat.
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.02313 83rd percentileScored 2026-11-07
Fix Partial org.apache.tomcat:tomcat-websocket (Maven): 11.0.0-M17, 10.1.19, 9.0.86 +1org.apache.tomcat.embed:tomcat-embed-websocket (Maven): 11.0.0-M17, 10.1.19, 9.0.86 +1Red Hat: 9 advisoriesRed Hat: 12 fixed, 3 without a fix
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Apache | Apache Tomcat | 11.0.0-M1 – 11.0.0-M16; 10.1.0-M1 – 10.1.18; 9.0.0-M1 – 9.0.85; 8.5.0 – 8.5.98 | — | No fix listed | CNA |
| — | org.apache.tomcat:tomcat-websocket (Maven) | 11.0.0-M1 to before 11.0.0-M17 | 11.0.0-M17 | Patch available | GHSA-v682-8vv8-vpwr |
| — | org.apache.tomcat:tomcat-websocket (Maven) | 10.1.0-M1 to before 10.1.19 | 10.1.19 | Patch available | GHSA-v682-8vv8-vpwr |
| — | org.apache.tomcat:tomcat-websocket (Maven) | 9.0.0-M1 to before 9.0.86 | 9.0.86 | Patch available | GHSA-v682-8vv8-vpwr |
| — | org.apache.tomcat:tomcat-websocket (Maven) | 8.5.0 to before 8.5.99 | 8.5.99 | Patch available | GHSA-v682-8vv8-vpwr |
| — | org.apache.tomcat.embed:tomcat-embed-websocket (Maven) | 11.0.0-M1 to before 11.0.0-M17 | 11.0.0-M17 | Patch available | GHSA-v682-8vv8-vpwr |
| — | org.apache.tomcat.embed:tomcat-embed-websocket (Maven) | 10.1.0-M1 to before 10.1.19 | 10.1.19 | Patch available | GHSA-v682-8vv8-vpwr |
| — | org.apache.tomcat.embed:tomcat-embed-websocket (Maven) | 9.0.0-M1 to before 9.0.86 | 9.0.86 | Patch available | GHSA-v682-8vv8-vpwr |
| — | org.apache.tomcat.embed:tomcat-embed-websocket (Maven) | 8.5.0 to before 8.5.99 | 8.5.99 | Patch available | GHSA-v682-8vv8-vpwr |
- Apache Tomcat VendorApache Affected 11.0.0-M1 – 11.0.0-M16; 10.1.0-M1 – 10.1.18; 9.0.0-M1 – 9.0.85; 8.5.0 – 8.5.98 Fixed in — No fix listed CNA
- org.apache.tomcat:tomcat-websocket (Maven) Vendor— Affected 11.0.0-M1 to before 11.0.0-M17 Fixed in 11.0.0-M17 Patch available GHSA-v682-8vv8-vpwr
- org.apache.tomcat:tomcat-websocket (Maven) Vendor— Affected 10.1.0-M1 to before 10.1.19 Fixed in 10.1.19 Patch available GHSA-v682-8vv8-vpwr
- org.apache.tomcat:tomcat-websocket (Maven) Vendor— Affected 9.0.0-M1 to before 9.0.86 Fixed in 9.0.86 Patch available GHSA-v682-8vv8-vpwr
- org.apache.tomcat:tomcat-websocket (Maven) Vendor— Affected 8.5.0 to before 8.5.99 Fixed in 8.5.99 Patch available GHSA-v682-8vv8-vpwr
- org.apache.tomcat.embed:tomcat-embed-websocket (Maven) Vendor— Affected 11.0.0-M1 to before 11.0.0-M17 Fixed in 11.0.0-M17 Patch available GHSA-v682-8vv8-vpwr
- org.apache.tomcat.embed:tomcat-embed-websocket (Maven) Vendor— Affected 10.1.0-M1 to before 10.1.19 Fixed in 10.1.19 Patch available GHSA-v682-8vv8-vpwr
- org.apache.tomcat.embed:tomcat-embed-websocket (Maven) Vendor— Affected 9.0.0-M1 to before 9.0.86 Fixed in 9.0.86 Patch available GHSA-v682-8vv8-vpwr
- org.apache.tomcat.embed:tomcat-embed-websocket (Maven) Vendor— Affected 8.5.0 to before 8.5.99 Fixed in 8.5.99 Patch available GHSA-v682-8vv8-vpwr
CPE configurations NVD · 20
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:* | 8.5.0 to before 8.5.99; 9.0.0 to before 9.0.86; 10.1.0 to before 10.1.19 | Vulnerable | Apache |
| cpe:2.3:a:apache:tomcat:11.0.0:milestone1:*:*:*:*:*:* | 11.0.0 milestone1 | Vulnerable | Apache |
| cpe:2.3:a:apache:tomcat:11.0.0:milestone10:*:*:*:*:*:* | 11.0.0 milestone10 | Vulnerable | Apache |
| cpe:2.3:a:apache:tomcat:11.0.0:milestone11:*:*:*:*:*:* | 11.0.0 milestone11 | Vulnerable | Apache |
| cpe:2.3:a:apache:tomcat:11.0.0:milestone12:*:*:*:*:*:* | 11.0.0 milestone12 | Vulnerable | Apache |
| cpe:2.3:a:apache:tomcat:11.0.0:milestone13:*:*:*:*:*:* | 11.0.0 milestone13 | Vulnerable | Apache |
| cpe:2.3:a:apache:tomcat:11.0.0:milestone14:*:*:*:*:*:* | 11.0.0 milestone14 | Vulnerable | Apache |
| cpe:2.3:a:apache:tomcat:11.0.0:milestone15:*:*:*:*:*:* | 11.0.0 milestone15 | Vulnerable | Apache |
| cpe:2.3:a:apache:tomcat:11.0.0:milestone16:*:*:*:*:*:* | 11.0.0 milestone16 | Vulnerable | Apache |
| cpe:2.3:a:apache:tomcat:11.0.0:milestone2:*:*:*:*:*:* | 11.0.0 milestone2 | Vulnerable | Apache |
- cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:* Versions 8.5.0 to before 8.5.99; 9.0.0 to before 9.0.86; 10.1.0 to before 10.1.19 Vulnerable ·Apache
- cpe:2.3:a:apache:tomcat:11.0.0:milestone1:*:*:*:*:*:* Versions 11.0.0 milestone1 Vulnerable ·Apache
- cpe:2.3:a:apache:tomcat:11.0.0:milestone10:*:*:*:*:*:* Versions 11.0.0 milestone10 Vulnerable ·Apache
- cpe:2.3:a:apache:tomcat:11.0.0:milestone11:*:*:*:*:*:* Versions 11.0.0 milestone11 Vulnerable ·Apache
- cpe:2.3:a:apache:tomcat:11.0.0:milestone12:*:*:*:*:*:* Versions 11.0.0 milestone12 Vulnerable ·Apache
- cpe:2.3:a:apache:tomcat:11.0.0:milestone13:*:*:*:*:*:* Versions 11.0.0 milestone13 Vulnerable ·Apache
- cpe:2.3:a:apache:tomcat:11.0.0:milestone14:*:*:*:*:*:* Versions 11.0.0 milestone14 Vulnerable ·Apache
- cpe:2.3:a:apache:tomcat:11.0.0:milestone15:*:*:*:*:*:* Versions 11.0.0 milestone15 Vulnerable ·Apache
- cpe:2.3:a:apache:tomcat:11.0.0:milestone16:*:*:*:*:*:* Versions 11.0.0 milestone16 Vulnerable ·Apache
- cpe:2.3:a:apache:tomcat:11.0.0:milestone2:*:*:*:*:*:* Versions 11.0.0 milestone2 Vulnerable ·Apache
Show 10 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:apache:tomcat:11.0.0:milestone3:*:*:*:*:*:* | 11.0.0 milestone3 | Vulnerable | Apache |
| cpe:2.3:a:apache:tomcat:11.0.0:milestone4:*:*:*:*:*:* | 11.0.0 milestone4 | Vulnerable | Apache |
| cpe:2.3:a:apache:tomcat:11.0.0:milestone5:*:*:*:*:*:* | 11.0.0 milestone5 | Vulnerable | Apache |
| cpe:2.3:a:apache:tomcat:11.0.0:milestone6:*:*:*:*:*:* | 11.0.0 milestone6 | Vulnerable | Apache |
| cpe:2.3:a:apache:tomcat:11.0.0:milestone7:*:*:*:*:*:* | 11.0.0 milestone7 | Vulnerable | Apache |
| cpe:2.3:a:apache:tomcat:11.0.0:milestone8:*:*:*:*:*:* | 11.0.0 milestone8 | Vulnerable | Apache |
| cpe:2.3:a:apache:tomcat:11.0.0:milestone9:*:*:*:*:*:* | 11.0.0 milestone9 | Vulnerable | Apache |
| cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* | 10.0 | Vulnerable | Debian |
| cpe:2.3:o:fedoraproject:fedora:39:*:*:*:*:*:*:* | 39 | Vulnerable | Fedoraproject |
| cpe:2.3:o:fedoraproject:fedora:40:*:*:*:*:*:*:* | 40 | Vulnerable | Fedoraproject |
- cpe:2.3:a:apache:tomcat:11.0.0:milestone3:*:*:*:*:*:* Versions 11.0.0 milestone3 Vulnerable ·Apache
- cpe:2.3:a:apache:tomcat:11.0.0:milestone4:*:*:*:*:*:* Versions 11.0.0 milestone4 Vulnerable ·Apache
- cpe:2.3:a:apache:tomcat:11.0.0:milestone5:*:*:*:*:*:* Versions 11.0.0 milestone5 Vulnerable ·Apache
- cpe:2.3:a:apache:tomcat:11.0.0:milestone6:*:*:*:*:*:* Versions 11.0.0 milestone6 Vulnerable ·Apache
- cpe:2.3:a:apache:tomcat:11.0.0:milestone7:*:*:*:*:*:* Versions 11.0.0 milestone7 Vulnerable ·Apache
- cpe:2.3:a:apache:tomcat:11.0.0:milestone8:*:*:*:*:*:* Versions 11.0.0 milestone8 Vulnerable ·Apache
- cpe:2.3:a:apache:tomcat:11.0.0:milestone9:*:*:*:*:*:* Versions 11.0.0 milestone9 Vulnerable ·Apache
- cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* Versions 10.0 Vulnerable ·Debian
- cpe:2.3:o:fedoraproject:fedora:39:*:*:*:*:*:*:* Versions 39 Vulnerable ·Fedoraproject
- cpe:2.3:o:fedoraproject:fedora:40:*:*:*:*:*:*:* Versions 40 Vulnerable ·Fedoraproject
Remediation
- Fix · GHSA-v682-8vv8-vpwr org.apache.tomcat:tomcat-websocket (Maven) Fixed in 11.0.0-M17 Advisory →
- Fix · GHSA-v682-8vv8-vpwr org.apache.tomcat:tomcat-websocket (Maven) Fixed in 10.1.19 Advisory →
- Fix · GHSA-v682-8vv8-vpwr org.apache.tomcat:tomcat-websocket (Maven) Fixed in 9.0.86 Advisory →
- Fix · GHSA-v682-8vv8-vpwr org.apache.tomcat:tomcat-websocket (Maven) Fixed in 8.5.99 Advisory →
- Fix · GHSA-v682-8vv8-vpwr org.apache.tomcat.embed:tomcat-embed-websocket (Maven) Fixed in 11.0.0-M17 Advisory →
- Fix · GHSA-v682-8vv8-vpwr org.apache.tomcat.embed:tomcat-embed-websocket (Maven) Fixed in 10.1.19 Advisory →
- Fix · GHSA-v682-8vv8-vpwr org.apache.tomcat.embed:tomcat-embed-websocket (Maven) Fixed in 9.0.86 Advisory →
- Fix · GHSA-v682-8vv8-vpwr org.apache.tomcat.embed:tomcat-embed-websocket (Maven) Fixed in 8.5.99 Advisory →
Red Hat 9 advisories
- RHSA-2025:7497 Released 2025-05-13 · Red Hat rating Moderatetomcat security update
- Red Hat Enterprise Linux AppStream (v. 10) tomcat-1:10.1.36-1.el10_0, tomcat-admin-webapps-1:10.1.36-1.el10_0, tomcat-docs-webapp-1:10.1.36-1.el10_0 +5
- RHSA-2024:3814 Released 2024-06-11 · Red Hat rating Importanttomcat security and bug fix update
- Red Hat Enterprise Linux AppStream EUS (v.8.8) tomcat-1:9.0.87-1.el8_8.2, tomcat-admin-webapps-1:9.0.87-1.el8_8.2, tomcat-docs-webapp-1:9.0.87-1.el8_8.2 +5
- RHSA-2024:3666 Released 2024-06-06 · Red Hat rating Importanttomcat security and bug fix update
- Red Hat Enterprise Linux AppStream (v. 8) tomcat-1:9.0.87-1.el8_10.1, tomcat-admin-webapps-1:9.0.87-1.el8_10.1, tomcat-docs-webapp-1:9.0.87-1.el8_10.1 +5
Show 6 more Red Hat advisories
- RHSA-2024:3307 Released 2024-05-23 · Red Hat rating Importanttomcat security and bug fix update
- Red Hat Enterprise Linux AppStream (v. 9) tomcat-1:9.0.87-1.el9_4.1, tomcat-admin-webapps-1:9.0.87-1.el9_4.1, tomcat-docs-webapp-1:9.0.87-1.el9_4.1 +5
- RHSA-2024:3308 Released 2024-05-23 · Red Hat rating Importanttomcat security and bug fix update
- Red Hat Enterprise Linux AppStream EUS (v.9.2) tomcat-1:9.0.87-1.el9_2.1, tomcat-admin-webapps-1:9.0.87-1.el9_2.1, tomcat-docs-webapp-1:9.0.87-1.el9_2.1 +5
- RHSA-2024:1916 Released 2024-05-07 · Red Hat rating ImportantRed Hat JBoss Web Server 6.0.2 release and security update
- Red Hat JBoss Web Server 6.0 for RHEL 8 jws6-tomcat-10.1.8-7.redhat_00014.1.el8jws, jws6-tomcat-admin-webapps-10.1.8-7.redhat_00014.1.el8jws, jws6-tomcat-docs-webapp-10.1.8-7.redhat_00014.1.el8jws +7
- Red Hat JBoss Web Server 6.0 for RHEL 9 jws6-tomcat-10.1.8-7.redhat_00014.1.el9jws, jws6-tomcat-admin-webapps-10.1.8-7.redhat_00014.1.el9jws, jws6-tomcat-docs-webapp-10.1.8-7.redhat_00014.1.el9jws +7
- RHSA-2024:1917 Released 2024-05-07 · Red Hat rating ImportantRed Hat JBoss Web Server 6.0.2 release and security update
- Red Hat JBoss Web Server 6
- RHSA-2024:1913 Released 2024-05-07 · Red Hat rating ImportantRed Hat JBoss Web Server 5.8.0 release and security update
- Red Hat JBoss Web Server 5.8 for RHEL 7 Server jws5-tomcat-9.0.87-3.redhat_00003.1.el7jws, jws5-tomcat-admin-webapps-9.0.87-3.redhat_00003.1.el7jws, jws5-tomcat-docs-webapp-9.0.87-3.redhat_00003.1.el7jws +9
- Red Hat JBoss Web Server 5.8 for RHEL 8 jws5-tomcat-9.0.87-3.redhat_00003.1.el8jws, jws5-tomcat-admin-webapps-9.0.87-3.redhat_00003.1.el8jws, jws5-tomcat-docs-webapp-9.0.87-3.redhat_00003.1.el8jws +7
- Red Hat JBoss Web Server 5.8 for RHEL 9 jws5-tomcat-9.0.87-3.redhat_00003.1.el9jws, jws5-tomcat-admin-webapps-9.0.87-3.redhat_00003.1.el9jws, jws5-tomcat-docs-webapp-9.0.87-3.redhat_00003.1.el9jws +7
- RHSA-2024:1914 Released 2024-05-07 · Red Hat rating ImportantRed Hat JBoss Web Server 5.8.0 release and security update
- Red Hat JBoss Web Server 5
Vendor assessments
Red Hat
Red Hat rating: Important. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 8 | Affected | No fix planned: Will not fix |
| Red Hat Enterprise Linux 9 | Affected | No fix planned: Will not fix |
| Red Hat Enterprise Linux AppStream (v. 10) | Fixed | RHSA-2025:7497 |
| Red Hat Enterprise Linux AppStream (v. 8) | Fixed | RHSA-2024:3666 |
| Red Hat Enterprise Linux AppStream (v. 9) | Fixed | RHSA-2024:3307 |
| Red Hat Enterprise Linux AppStream EUS (v.8.8) | Fixed | RHSA-2024:3814 |
| Red Hat Enterprise Linux AppStream EUS (v.9.2) | Fixed | RHSA-2024:3308 |
| Red Hat JBoss Web Server 5 | Fixed | RHSA-2024:1914 |
| Red Hat JBoss Web Server 5.8 for RHEL 7 Server | Fixed | RHSA-2024:1913 |
| Red Hat JBoss Web Server 5.8 for RHEL 8 | Fixed | RHSA-2024:1913 |
| Red Hat JBoss Web Server 5.8 for RHEL 9 | Fixed | RHSA-2024:1913 |
| Red Hat JBoss Web Server 6 | Fixed | RHSA-2024:1917 |
| Red Hat JBoss Web Server 6.0 for RHEL 8 | Fixed | RHSA-2024:1916 |
| Red Hat JBoss Web Server 6.0 for RHEL 9 | Fixed | RHSA-2024:1916 |
Not affected: 6 products
- Red Hat Enterprise Linux 7
- Red Hat JBoss Web Server 5.8 for RHEL 7 Server
- Red Hat JBoss Web Server 5.8 for RHEL 8
- Red Hat JBoss Web Server 5.8 for RHEL 9
- Red Hat JBoss Web Server 6.0 for RHEL 8
- Red Hat JBoss Web Server 6.0 for RHEL 9
Timeline
- 2026-10-02 Threatist record created from CVE-2024-23672
- 2026-10-03 Alias added: GHSA-v682-8vv8-vpwr
- 2026-10-09 Fix available: RHSA-2024:1917 · Red Hat
- 2026-11-05 Fix available: Red Hat JBoss Web Server 6 · Red Hat
References
Advisory 6
- https://lists.apache.org/thread/cmpswfx6tj4s7x0nxxosvfqs11lvdx2f
- https://nvd.nist.gov/vuln/detail/CVE-2024-23672
- https://lists.debian.org/debian-lts-announce/2024/04/msg00001.html
- https://lists.fedoraproject.org/archives/list/[email protected]/message/3UWIS5MMGYDZBLJYT674ZI5AWFHDZ46B/
- https://lists.fedoraproject.org/archives/list/[email protected]/message/736G4GPZWS2DSQO5WKXO3G6OMZKFEK55/
- https://security.netapp.com/advisory/ntap-20240402-0002/
Other 9
- https://github.com/apache/tomcat/commit/0052b374684b613b0c849899b325ebe334ac6501
- https://github.com/apache/tomcat/commit/3631adb1342d8bbd8598802a12b63ad02c37d591
- https://github.com/apache/tomcat/commit/52d6650e062d880704898d7d8c1b2b7a3efe8068
- https://github.com/apache/tomcat/commit/b0e3b1bd78de270d53e319d7cb79eb282aa53cb9
- https://github.com/apache/tomcat
- https://lists.fedoraproject.org/archives/list/[email protected]/message/3UWIS5MMGYDZBLJYT674ZI5AWFHDZ46B
- https://lists.fedoraproject.org/archives/list/[email protected]/message/736G4GPZWS2DSQO5WKXO3G6OMZKFEK55
- https://security.netapp.com/advisory/ntap-20240402-0002
- http://www.openwall.com/lists/oss-security/2024/03/13/4
More Apache Tomcat vulnerabilities
- TI-2025-18529 Apache Tomcat: Potential RCE and/or information disclosure and/or information corruption with partial PUT KEVCVSS 3.1CRITICAL 10.0
- TI-2020-01862 Improper privilege management in Apache Tomcat KEVCVSS 3.1CRITICAL 9.8
- TI-2016-07192 Improper access control in Apache Tomcat KEVCVSS 3.1CRITICAL 9.8
- TI-2017-09342 Unrestricted file upload in Apache Tomcat KEVCVSS 3.1HIGH 8.1
- TI-2017-09340 Unrestricted file upload in Apache Tomcat KEVCVSS 3.1HIGH 8.1
- TI-2026-26741 Apache Tomcat: Fix for CVE-2026-29146 allowed bypass of EncryptInterceptor KEVCVSS 3.1HIGH 7.5
Sources
- CVE-2024-23672 · CVE Program
- CVE-2024-23672 · NVD
- FIRST EPSS
- GHSA-v682-8vv8-vpwr · GitHub Advisory Database · CC BY 4.0
- CVE-2024-23672 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences