CVE-2024-23672

Apache Tomcat: WebSocket DoS with incomplete closing handshake

MEDIUM
6.3
CVSS Score
Published: March 13, 2024 at 03:48 PM UTC
Updated: June 17, 2026 at 07:13 AM UTC
3 products affected across 3 vendorsDebian LinuxFedoraTomcat

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Severity
MEDIUM6.3
Exploit prediction
EPSS 2%
SSVC
No known exploit

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Affected range stops below 10.1.19, so it looks safe — our inference, not a vendor statement
Affected range stops below 8.5.99, so it looks safe — our inference, not a vendor statement
Affected range stops below 9.0.86, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in 10.0.0-M1 (unknown)
Vendor states this is fixed in 7 (unknown)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

References (6)

Mailing List
Source: af854a3a-2127-422b-91ae-364da2661108
http://www.openwall.com/lists/oss-security/2024/03/13/4
Mailing ListThird Party Advisory
Source: af854a3a-2127-422b-91ae-364da2661108
https://lists.debian.org/debian-lts-announce/2024/04/msg00001.html
Third Party Advisory
Source: af854a3a-2127-422b-91ae-364da2661108
https://security.netapp.com/advisory/ntap-20240402-0002/

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.3MEDIUMCISA-ADP
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
LOW
Availability
LOW
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-459

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