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CVE-2021-43980

Published: 28 September 2022

The simplified implementation of blocking reads and writes introduced in Tomcat 10 and back-ported to Tomcat 9.0.47 onwards exposed a long standing (but extremely hard to trigger) concurrency bug in Apache Tomcat 10.1.0 to 10.1.0-M12, 10.0.0-M1 to 10.0.18, 9.0.0-M1 to 9.0.60 and 8.5.0 to 8.5.77 that could cause client connections to share an Http11Processor instance resulting in responses, or part responses, to be received by the wrong client.

Priority

Medium

Cvss 3 Severity Score

3.7

Score breakdown

Status

Package Release Status
tomcat9
Launchpad, Ubuntu, Debian
lunar Needs triage

xenial Does not exist

bionic Needs triage

focal Needs triage

trusty Does not exist

jammy Needs triage

upstream Needs triage

kinetic Ignored
(end of life, was needs-triage)
mantic Needs triage

tomcat6
Launchpad, Ubuntu, Debian
bionic Does not exist

focal Does not exist

jammy Does not exist

trusty Needs triage

upstream Needs triage

xenial Needs triage

tomcat7
Launchpad, Ubuntu, Debian
bionic Needs triage

focal Does not exist

jammy Does not exist

trusty Needs triage

upstream Needs triage

xenial Needs triage

tomcat8
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Needs triage

bionic Needs triage

focal Does not exist

jammy Does not exist

upstream Needs triage

Severity score breakdown

Parameter Value
Base score 3.7
Attack vector Network
Attack complexity High
Privileges required None
User interaction None
Scope Unchanged
Confidentiality Low
Integrity impact None
Availability impact None
Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N