title: Apache Tomcat: WebSocket DoS with incomplete closing handshake
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.
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.
problem types: CWE-459 Incomplete Cleanup
affected:
{
defaultStatus: unaffected
product: Apache Tomcat
vendor: Apache Software Foundation
versions:
lessThanOrEqual: 11.0.0-M16, status: affected, version: 11.0.0-M1, versionType: semver
lessThanOrEqual: 10.1.18, status: affected, version: 10.1.0-M1, versionType: semver
lessThanOrEqual: 9.0.85, status: affected, version: 9.0.0-M1, versionType: semver
lessThanOrEqual: 8.5.98, status: affected, version: 8.5.0, versionType: semver
}
metrics:
other: [
content: {'text': 'important'}
type: Textual description of severity
]