{"api_version":"1","generated_at":"2026-04-22T20:52:21+00:00","cve":"CVE-2020-17527","urls":{"html":"https://cve.report/CVE-2020-17527","api":"https://cve.report/api/cve/CVE-2020-17527.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2020-17527","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2020-17527"},"summary":{"title":"CVE-2020-17527","description":"While investigating bug 64830 it was discovered that Apache Tomcat 10.0.0-M1 to 10.0.0-M9, 9.0.0-M1 to 9.0.39 and 8.5.0 to 8.5.59 could re-use an HTTP request header value from the previous stream received on an HTTP/2 connection for the request associated with the subsequent stream. While this would most likely lead to an error and the closure of the HTTP/2 connection, it is possible that information could leak between requests.","state":"PUBLIC","assigner":"security@apache.org","published_at":"2020-12-03 19:15:00","updated_at":"2023-11-07 03:19:00"},"problem_types":["CWE-200"],"metrics":[],"references":[{"url":"https://lists.apache.org/thread.html/rce5ac9a40173651d540babce59f6f3825f12c6d4e886ba00823b11e5@%3Cannounce.apache.org%3E","name":"[announce] 20201203 [SECURITY] CVE-2020-17527 Apache Tomcat HTTP/2 Request header mix-up","refsource":"MLIST","tags":["Mailing List","Vendor Advisory"],"title":"Pony Mail!","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://lists.apache.org/thread.html/rce5ac9a40173651d540babce59f6f3825f12c6d4e886ba00823b11e5@%3Cannounce.tomcat.apache.org%3E","name":"[tomcat-announce] 20201203 [SECURITY] CVE-2020-17527 Apache Tomcat HTTP/2 Request header mix-up","refsource":"MLIST","tags":["Mailing List","Vendor 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Foundation"}]}},"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"While investigating bug 64830 it was discovered that Apache Tomcat 10.0.0-M1 to 10.0.0-M9, 9.0.0-M1 to 9.0.39 and 8.5.0 to 8.5.59 could re-use an HTTP request header value from the previous stream received on an HTTP/2 connection for the request associated with the subsequent stream. 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