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Missing Release of Resource after Effective Lifetime in Apache Tomcat

High severity GitHub Reviewed Published Oct 15, 2021 to the GitHub Advisory Database • Updated Mar 11, 2024

Package

maven org.apache.tomcat:tomcat (Maven)

Affected versions

>= 10.1.0-M1, <= 10.1.0-M5
>= 10.0.0-M1, < 10.0.12
>= 9.0.40, < 9.0.54
>= 8.5.60, < 8.5.72

Patched versions

10.1.0-M6
10.0.12
9.0.54
8.5.72

Description

The fix for bug 63362 present in Apache Tomcat 10.1.0-M1 to 10.1.0-M5, 10.0.0-M1 to 10.0.11, 9.0.40 to 9.0.53 and 8.5.60 to 8.5.71 introduced a memory leak. The object introduced to collect metrics for HTTP upgrade connections was not released for WebSocket connections once the connection was closed. This created a memory leak that, over time, could lead to a denial of service via an OutOfMemoryError.

References

Published by the National Vulnerability Database Oct 14, 2021
Reviewed Oct 15, 2021
Published to the GitHub Advisory Database Oct 15, 2021
Last updated Mar 11, 2024

Severity

High

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS score

4.126%
(92nd percentile)

Weaknesses

CVE ID

CVE-2021-42340

GHSA ID

GHSA-wph7-x527-w3h5

Source code

Credits

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