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.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
SUSE Affected 1 release
| Version | Status | Fixed in |
|---|---|---|
| — | Affected | — |
Debian Fixed 5 releases
| Version | Status | Fixed in |
|---|---|---|
| trixie | Fixed | 9.0.38-1 |
| sid | Fixed | 9.0.38-1 |
| forky | Fixed | 9.0.38-1 |
| bullseye | Fixed | 9.0.38-1 |
| bookworm | Fixed | 9.0.38-1 |
Package impact
| Ecosystem | Package | Vulnerable | Fixed |
|---|---|---|---|
| Maven | org.apache.tomcat:tomcat-coyote | >=10.0.0-M1,<10.0.0-M8 | 10.0.0-M8 |
| Maven | org.apache.tomcat:tomcat-coyote | >=9.0.0-M1,<9.0.38 | 9.0.38 |
| Maven | org.apache.tomcat:tomcat-coyote | >=8.5.0,<8.5.58 | 8.5.58 |
References
- https://www.suse.com/security/cve/CVE-2020-13943.html
- https://nvd.nist.gov/vuln/detail/CVE-2020-13943
- https://github.com/apache/tomcat/commit/1bbc650cbc3f08d85a1ec6d803c47ae53a84f3bb
- https://github.com/apache/tomcat/commit/55911430df13f8c9998fbdee1f9716994d2db59b
- https://github.com/apache/tomcat/commit/9d7def063b47407a09a2f9202beed99f4dcb292a
- 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
- https://www.debian.org/security/2021/dsa-4835
- https://www.oracle.com/security-alerts/cpuApr2021.html
- http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00002.html
- http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00021.html
- https://security-tracker.debian.org/tracker/CVE-2020-13943
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.