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Uncontrolled Resource Consumption in Apache Tomcat

High severity GitHub Reviewed Published Feb 9, 2022 to the GitHub Advisory Database • Updated Mar 11, 2024

Package

maven org.apache.tomcat:tomcat (Maven)

Affected versions

>= 10.0.0-M1, <= 10.0.0-M4
>= 9.0.0.M1, < 9.0.35
>= 8.5.0, < 8.5.55

Patched versions

10.0.0-M5
9.0.35
8.5.55

Description

A specially crafted sequence of HTTP/2 requests sent to Apache Tomcat 10.0.0-M1 to 10.0.0-M5, 9.0.0.M1 to 9.0.35 and 8.5.0 to 8.5.55 could trigger high CPU usage for several seconds. If a sufficient number of such requests were made on concurrent HTTP/2 connections, the server could become unresponsive.

References

Published by the National Vulnerability Database Jun 26, 2020
Reviewed Apr 12, 2021
Published to the GitHub Advisory Database Feb 9, 2022
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

0.183%
(56th percentile)

Weaknesses

CVE ID

CVE-2020-11996

GHSA ID

GHSA-53hp-jpwq-2jgq

Source code

Credits

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