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.

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Tracking

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Advisories
Source ID Title
Debian DLA Debian DLA DLA-2407-1 tomcat8 security update
Debian DSA Debian DSA DSA-4835-1 tomcat9 security update
EUVD EUVD EUVD-2022-0967 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.
Github GHSA Github GHSA GHSA-f268-65qc-98vg Exposure of Sensitive Information to an Unauthorized Actor in Apache Tomcat
Ubuntu USN Ubuntu USN USN-5360-1 Tomcat vulnerabilities
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Sat, 12 Jul 2025 13:45:00 +0000

Type Values Removed Values Added
Metrics epss

{'score': 0.09572}

epss

{'score': 0.12123}


cve-icon MITRE

Status: PUBLISHED

Assigner: apache

Published:

Updated: 2024-08-04T12:32:14.470Z

Reserved: 2020-06-08T00:00:00.000Z

Link: CVE-2020-13943

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Modified

Published: 2020-10-12T14:15:12.183

Modified: 2024-11-21T05:02:11.967

Link: CVE-2020-13943

cve-icon Redhat

Severity : Moderate

Publid Date: 2020-10-12T00:00:00Z

Links: CVE-2020-13943 - Bugzilla

cve-icon OpenCVE Enrichment

No data.

Weaknesses