CVE-2020-13943

Description

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.

4.3

CVSS

Severity: Medium

CVSS 3.1 •

CVSS 2.0 •

EPSS 11.86% Top 10%

Vendor Advisory opensuse.org Vendor Advisory opensuse.org Vendor Advisory debian.org Vendor Advisory apache.org

Affected: n/a Apache Tomcat

References

Link	Tags
https://lists.apache.org/thread.html/r4a390027eb27e4550142fac6c8317cc684b157ae314d31514747f307%40%3Cannounce.tomcat.apache.org%3E	vendor advisory
https://lists.debian.org/debian-lts-announce/2020/10/msg00019.html	third party advisory mailing list
http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00002.html	mailing list third party advisory vendor advisory
http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00021.html	vendor advisory broken link
https://www.debian.org/security/2021/dsa-4835	third party advisory vendor advisory
https://www.oracle.com/security-alerts/cpuApr2021.html	third party advisory patch
https://security.netapp.com/advisory/ntap-20201016-0007/	third party advisory

Frequently Asked Questions

What is the severity of CVE-2020-13943?: CVE-2020-13943 has been scored as a medium severity vulnerability.
How to fix CVE-2020-13943?: To fix CVE-2020-13943, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2020-13943 being actively exploited in the wild?: It is possible that CVE-2020-13943 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~12% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2020-13943?: CVE-2020-13943 affects n/a Apache Tomcat.

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