CVE-2020-13943

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.

• http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00002.htmlMailing List, Third Party Advisory
• http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00021.htmlBroken Link
• https://lists.apache.org/thread.html/r4a390027eb27e4550142fac6c8317cc684b157ae314d31514747f307%40%3Cannounce.tomcat.apache.org%3EVendor Advisory
• https://lists.debian.org/debian-lts-announce/2020/10/msg00019.htmlThird Party Advisory
• https://security.netapp.com/advisory/ntap-20201016-0007/Third Party Advisory
• https://www.debian.org/security/2021/dsa-4835Third Party Advisory
• https://www.oracle.com/security-alerts/cpuApr2021.htmlPatch, Third Party Advisory
• http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00002.htmlMailing List, Third Party Advisory
• http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00021.htmlBroken Link
• https://lists.apache.org/thread.html/r4a390027eb27e4550142fac6c8317cc684b157ae314d31514747f307%40%3Cannounce.tomcat.apache.org%3EVendor Advisory
• https://lists.debian.org/debian-lts-announce/2020/10/msg00019.htmlThird Party Advisory
• https://security.netapp.com/advisory/ntap-20201016-0007/Third Party Advisory
• https://www.debian.org/security/2021/dsa-4835Third Party Advisory
• https://www.oracle.com/security-alerts/cpuApr2021.htmlPatch, Third Party Advisory

Published

Oct 12, 2020

Last Modified

Jun 17, 2026

Status

Modified

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