| Name | 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. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DLA-2407-1, DSA-4835-1 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| tomcat7 (PTS) | jessie, jessie (lts) | 7.0.56-3+really7.0.109-1+deb8u6 | fixed |
| stretch | 7.0.75-1 | fixed |
| tomcat8 (PTS) | jessie, jessie (lts) | 8.0.14-1+deb8u28 | fixed |
| stretch (security) | 8.5.54-0+deb9u8 | fixed |
| stretch (lts), stretch | 8.5.54-0+deb9u15 | fixed |
| tomcat9 (PTS) | buster (security), buster, buster (lts) | 9.0.31-1~deb10u12 | fixed |
| bullseye (security), bullseye | 9.0.43-2~deb11u10 | fixed |
| bookworm | 9.0.70-2 | fixed |
| sid, trixie | 9.0.95-1 | fixed |
The information below is based on the following data on fixed versions.
Notes
https://github.com/apache/tomcat/commit/55911430df13f8c9998fbdee1f9716994d2db59b (9.0.38)
https://github.com/apache/tomcat/commit/9d7def063b47407a09a2f9202beed99f4dcb292a (8.5.58)
- tomcat7 <not-affected> (HTTP/2 support not implemented)
[jessie] - tomcat8 <not-affected> (HTTP/2 support not implemented)