CVE-2020-13943: HTTP Request Smuggling

October 12, 2020 (updated June 14, 2021)

If a HTTP/2 client connecting to Apache Tomcat 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 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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