Detections
Analytics

Apache Tomcat 9.0.89 < 9.0.121 Denial of Service

high Web App Scanning Plugin ID 115351

Synopsis

Apache Tomcat 9.0.89 < 9.0.121 Denial of Service

Description

According to its self-reported version number, the version of Apache Tomcat installed on the remote host is 9.0.89 prior to 9.0.121, 10.1.24 prior 10.1.58, or 11.0.0-M20 prior 11.0.25. It is, therefore, affected by a denial of service vulnerability due to an unbounded buffer for undelivered messages in the WebSocket chat example application. A maliciously slow client can cause the buffer to grow continuously, eventually leading to memory exhaustion and failure of the Tomcat process.

Note that the scanner has not attempted to exploit these issues but has instead relied only on the application's self-reported version number.

Solution

Upgrade to Apache Tomcat version 9.0.121 or later.

See Also

https://tomcat.apache.org/security-9.html#Fixed_in_Apache_Tomcat_9.0.121

Plugin Details

Severity: High

ID: 115351

Type: Version Based

Published: 8/5/2026

Updated: 8/5/2026

Scan Template: basic, full, pci, scan

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.71

CVSS v2

Risk Factor: High

Base Score: 7.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C

CVSS Score Source: CVE-2026-66299

CVSS v3

Risk Factor: High

Base Score: 7.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS Score Source: CVE-2026-66299

Vulnerability Information

CPE: cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*

Exploit Ease: No known exploits are available

Vulnerability Publication Date: 7/27/2026

Reference Information

CVE: CVE-2026-66299