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.
- CVSS 3.1
- 4.3
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N - EPSS
- 55% chance of exploitation in the next 30 days; higher than 99% of CVEs (scores of 2026-10-25)
- Published
- Modified
- Record from
- the NVD, synced
Affected
- apache:tomcat
- debian:debian_linux
- oracle:instantis_enterprisetrack
- oracle:sd-wan_edge
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-f268-65qc-98vg | Maven | org.apache.tomcat:tomcat-coyote | >=10.0.0-M1 <10.0.0-M8 | 10.0.0-M8 |
| GHSA-f268-65qc-98vg | Maven | org.apache.tomcat:tomcat-coyote | >=9.0.0-M1 <9.0.38 | 9.0.38 |
| GHSA-f268-65qc-98vg | Maven | org.apache.tomcat:tomcat-coyote | >=8.5.0 <8.5.58 | 8.5.58 |
References
- http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00002.html
- http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00021.html
- https://lists.apache.org/thread.html/r4a390027eb27e4550142fac6c8317cc684b157ae314d31514747f307%40%3Cannounce.tomcat.apache.org%3E
- https://lists.debian.org/debian-lts-announce/2020/10/msg00019.html
- https://security.netapp.com/advisory/ntap-20201016-0007/