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

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

References

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