{"cve":"CVE-2020-17527","nvd":{"published":"2020-12-03T19:15:12.200","modified":"2026-10-08T22:16:57.557","status":"Modified","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","score":7.5},"cwes":["CWE-200"],"references":["http://www.openwall.com/lists/oss-security/2020/12/03/3","https://lists.apache.org/thread.html/r26a2a66339087fc37db3caf201e446d3e83b5cce314371e235ff1784%40%3Ccommits.tomee.apache.org%3E","https://lists.apache.org/thread.html/r2d6e05c5ff96f8068a59dfdb3800e9ee8d4e36ce1971783c6e5f9b20%40%3Ccommits.tomee.apache.org%3E","https://lists.apache.org/thread.html/r5a285242737ddef4d338236328aaaf3237183e1465a5efafd16b99ed%40%3Cdev.tomcat.apache.org%3E","https://lists.apache.org/thread.html/r8a227ac6a755a6406c1cc47dd48800e973d4cf13fe7fe68ac59c679c%40%3Cdev.tomcat.apache.org%3E"],"products":["apache:tomcat","debian:debian_linux","netapp:element_plug-in","netapp:oncommand_system_manager","oracle:blockchain_platform","oracle:communications_cloud_native_core_binding_support_function","oracle:communications_cloud_native_core_policy","oracle:communications_instant_messaging_server","oracle:instantis_enterprisetrack","oracle:mysql_enterprise_monitor","oracle:sd-wan_edge","oracle:workload_manager"],"source":"nvd","synced_at":"2026-10-19T21:11:20.317016139+00:00"},"epss":{"cve":"CVE-2020-17527","score":0.24622,"percentile":0.97869,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-vvw4-rfwf-p6hx","url":"https://osv.dev/vulnerability/GHSA-vvw4-rfwf-p6hx","summary":"Exposure of Sensitive Information to an Unauthorized Actor in Apache Tomcat","modified":"2024-03-11T16:46:35.446557Z","packages":[{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat-coyote","purl":"pkg:maven/org.apache.tomcat/tomcat-coyote","ranges":[">=10.0.0-M1 <10.0.0-M10"],"fixed":["10.0.0-M10"]},{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat-coyote","purl":"pkg:maven/org.apache.tomcat/tomcat-coyote","ranges":[">=9.0.0-M1 <9.0.40"],"fixed":["9.0.40"]},{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat-coyote","purl":"pkg:maven/org.apache.tomcat/tomcat-coyote","ranges":[">=8.5.0 <8.5.60"],"fixed":["8.5.60"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}