{"cve":"CVE-2021-25122","nvd":{"published":"2021-03-01T12:15:13.793","modified":"2026-10-08T22:17:08.263","status":"Modified","description":"When responding to new h2c connection requests, Apache Tomcat versions 10.0.0-M1 to 10.0.0, 9.0.0.M1 to 9.0.41 and 8.5.0 to 8.5.61 could duplicate request headers and a limited amount of request body from one request to another meaning user A and user B could both see the results of user A's request.","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/2021/03/01/1","https://lists.apache.org/thread.html/r7b95bc248603360501f18c8eb03bb6001ec0ee3296205b34b07105b7%40%3Cannounce.apache.org%3E","https://lists.apache.org/thread.html/r7b95bc248603360501f18c8eb03bb6001ec0ee3296205b34b07105b7%40%3Cannounce.tomcat.apache.org%3E","https://lists.apache.org/thread.html/r7b95bc248603360501f18c8eb03bb6001ec0ee3296205b34b07105b7%40%3Cannounce.tomcat.apache.org%3E","https://lists.apache.org/thread.html/r7b95bc248603360501f18c8eb03bb6001ec0ee3296205b34b07105b7%40%3Cannounce.tomcat.apache.org%3E"],"products":["apache:tomcat","debian:debian_linux","oracle:agile_product_lifecycle_management","oracle:communications_cloud_native_core_policy","oracle:communications_cloud_native_core_security_edge_protection_proxy","oracle:communications_instant_messaging_server","oracle:database","oracle:graph_server_and_client","oracle:instantis_enterprisetrack","oracle:managed_file_transfer","oracle:mysql_enterprise_monitor","oracle:siebel_ui_framework"],"source":"nvd","synced_at":"2026-10-19T21:15:50.279857260+00:00"},"epss":{"cve":"CVE-2021-25122","score":0.18114,"percentile":0.97177,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-j39c-c8hj-x4j3","url":"https://osv.dev/vulnerability/GHSA-j39c-c8hj-x4j3","summary":"Exposure of Sensitive Information to an Unauthorized Actor in Apache Tomcat","modified":"2026-08-26T01:21:18.074879844Z","packages":[{"ecosystem":"Maven","name":"org.apache.tomcat.embed:tomcat-embed-core","purl":"pkg:maven/org.apache.tomcat.embed/tomcat-embed-core","ranges":[">=10.0.0-M1 <10.0.2"],"fixed":["10.0.2"]},{"ecosystem":"Maven","name":"org.apache.tomcat.embed:tomcat-embed-core","purl":"pkg:maven/org.apache.tomcat.embed/tomcat-embed-core","ranges":[">=9.0.0-M1 <9.0.43"],"fixed":["9.0.43"]},{"ecosystem":"Maven","name":"org.apache.tomcat.embed:tomcat-embed-core","purl":"pkg:maven/org.apache.tomcat.embed/tomcat-embed-core","ranges":[">=8.5.0 <8.5.63"],"fixed":["8.5.63"]},{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat-coyote","purl":"pkg:maven/org.apache.tomcat/tomcat-coyote","ranges":[">=10.0.0-M1 <10.0.2"],"fixed":["10.0.2"]}]}],"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."]}