PT-2020-13794 · Apache+4 · Apache Tomcat+4
Published
2020-09-15
·
Updated
2026-03-26
·
CVE-2020-13943
CVSS v3.1
4.3
Medium
| Vector | AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N |
Name of the Vulnerable Software and Affected Versions
Apache Tomcat versions 8.5.0 through 8.5.57
Apache Tomcat versions 9.0.0.M1 through 9.0.37
Apache Tomcat versions 10.0.0-M1 through 10.0.0-M7
Description
If an HTTP/2 client exceeds the agreed maximum number of concurrent streams for a connection, in violation of the HTTP/2 protocol, it is 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.
Recommendations
For Apache Tomcat versions 8.5.0 through 8.5.57, update to a version outside of this range to resolve the issue.
For Apache Tomcat versions 9.0.0.M1 through 9.0.37, update to a version outside of this range to resolve the issue.
For Apache Tomcat versions 10.0.0-M1 through 10.0.0-M7, update to a version outside of this range to resolve the issue.
As a temporary workaround, consider restricting the maximum number of concurrent streams for a connection to prevent violation of the HTTP/2 protocol.
Exploit
Fix
Information Disclosure
Found an issue in the description? Have something to add? Feel free to write us 👾
Weakness Enumeration
Related Identifiers
Affected Products
Alt Linux
Apache Tomcat
Linuxmint
Suse
Ubuntu