CVE-2020-13943: HTTP Request Smuggling

October 12, 2020 (updated June 14, 2021)

If an HTTP/2 client connecting to Apache Tomcat to M1 to to 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.

References

nvd.nist.gov/vuln/detail/CVE-2020-13943

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