CVE-2020-13943

Published: 12 October 2020

If an HTTP/2 client connecting to Apache Tomcat 10.0.0-M1 to 10.0.0-M7, 9.0.0.M1 to 9.0.37 or 8.5.0 to 8.5.57 exceeded the agreed maximum number of concurrent streams for a connection (in violation of the HTTP/2 protocol), it was possible that a subsequent request made on that connection could contain HTTP headers - including HTTP/2 pseudo headers - from a previous request rather than the intended headers. This could lead to users seeing responses for unexpected resources.

Priority

Cvss 3 Severity Score

4.3

Score breakdown

Status

Package	Release	Status
tomcat8 Launchpad, Ubuntu, Debian	bionic	Not vulnerable (code not present)
	focal	Does not exist
	trusty	Does not exist
	upstream	Needs triage
	xenial	Not vulnerable (code not present)
tomcat9 Launchpad, Ubuntu, Debian	bionic	Not vulnerable (code not present)
	focal	Not vulnerable (code not present)
	trusty	Does not exist
	upstream	Released (9.0.38-1)
	xenial	Does not exist

Severity score breakdown

Parameter	Value
Base score	4.3
Attack vector	Network
Attack complexity	Low
Privileges required	Low
User interaction	None
Scope	Unchanged
Confidentiality	Low
Integrity impact	None
Availability impact	None
Vector	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

References

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