Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Apache | Tomcat | 8.5.0 |
| Debian | Debian Linux | 9.0 |
| Oracle | Instantis Enterprisetrack | 17.1 |
| Oracle | Sd-Wan Edge | 9.0 |
References
- http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00002.htmlMailing ListThird Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00021.htmlBroken Link
- https://lists.apache.org/thread.html/r4a390027eb27e4550142fac6c8317cc684b157ae31Vendor 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.htmlPatchThird Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00002.htmlMailing ListThird Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00021.htmlBroken Link
- https://lists.apache.org/thread.html/r4a390027eb27e4550142fac6c8317cc684b157ae31Vendor 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.htmlPatchThird Party Advisory
FAQ
What is CVE-2020-13943?
CVE-2020-13943 is a vulnerability with a CVSS score of 4.3 (MEDIUM). 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...
How severe is CVE-2020-13943?
CVE-2020-13943 has been rated MEDIUM with a CVSS base score of 4.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2020-13943?
Check the references section above for vendor advisories and patch information. Affected products include: Apache Tomcat, Debian Debian Linux, Oracle Instantis Enterprisetrack, Oracle Sd-Wan Edge.