{"cve":"CVE-2020-9484","nvd":{"published":"2020-05-20T19:15:09.257","modified":"2026-10-08T21:17:32.813","status":"Modified","description":"When using Apache Tomcat versions 10.0.0-M1 to 10.0.0-M4, 9.0.0.M1 to 9.0.34, 8.5.0 to 8.5.54 and 7.0.0 to 7.0.103 if a) an attacker is able to control the contents and name of a file on the server; and b) the server is configured to use the PersistenceManager with a FileStore; and c) the PersistenceManager is configured with sessionAttributeValueClassNameFilter=\"null\" (the default unless a SecurityManager is used) or a sufficiently lax filter to allow the attacker provided object to be deserialized; and d) the attacker knows the relative file path from the storage location used by FileStore to the file the attacker has control over; then, using a specifically crafted request, the attacker will be able to trigger remote code execution via deserialization of the file under their control. Note that all of conditions a) to d) must be true for the attack to succeed.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.0},"cwes":["CWE-502"],"references":["http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00057.html","http://packetstormsecurity.com/files/157924/Apache-Tomcat-CVE-2020-9484-Proof-Of-Concept.html","http://seclists.org/fulldisclosure/2020/Jun/6","http://www.openwall.com/lists/oss-security/2021/03/01/2","https://kc.mcafee.com/corporate/index?page=content&id=SB10332"],"products":["apache:tomcat","canonical:ubuntu_linux","debian:debian_linux","fedoraproject:fedora","mcafee:epolicy_orchestrator","opensuse:leap","oracle:agile_engineering_data_management","oracle:agile_product_lifecycle_management","oracle:communications_cloud_native_core_binding_support_function","oracle:communications_cloud_native_core_policy","oracle:communications_diameter_signaling_router","oracle:communications_element_manager","oracle:communications_instant_messaging_server","oracle:communications_session_report_manager","oracle:communications_session_route_manager","oracle:database","oracle:fmw_platform","oracle:hospitality_guest_access","oracle:instantis_enterprisetrack","oracle:managed_file_transfer","oracle:mysql_enterprise_monitor","oracle:retail_order_broker","oracle:siebel_apps_-_marketing","oracle:siebel_ui_framework","oracle:transportation_management","oracle:workload_manager"],"source":"nvd","synced_at":"2026-10-19T21:05:42.039641217+00:00"},"epss":{"cve":"CVE-2020-9484","score":0.5552,"percentile":0.99029,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-344f-f5vg-2jfj","url":"https://osv.dev/vulnerability/GHSA-344f-f5vg-2jfj","summary":"Potential remote code execution in Apache Tomcat","modified":"2026-08-26T01:19:37.725703633Z","packages":[{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat-catalina","purl":"pkg:maven/org.apache.tomcat/tomcat-catalina","ranges":[">=10.0.0-M1 <10.0.0-M5"],"fixed":["10.0.0-M5"]},{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat-catalina","purl":"pkg:maven/org.apache.tomcat/tomcat-catalina","ranges":[">=9.0.0 <9.0.35"],"fixed":["9.0.35"]},{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat-catalina","purl":"pkg:maven/org.apache.tomcat/tomcat-catalina","ranges":[">=8.0.0 <8.5.55"],"fixed":["8.5.55"]},{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat-catalina","purl":"pkg:maven/org.apache.tomcat/tomcat-catalina","ranges":[">=7.0.0 <7.0.104"],"fixed":["7.0.104"]},{"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 <10.0.0-M5"],"fixed":["10.0.0-M5"]},{"ecosystem":"Maven","name":"org.apache.tomcat.embed:tomcat-embed-core","purl":"pkg:maven/org.apache.tomcat.embed/tomcat-embed-core","ranges":[">=9.0.0 <9.0.35"],"fixed":["9.0.35"]},{"ecosystem":"Maven","name":"org.apache.tomcat.embed:tomcat-embed-core","purl":"pkg:maven/org.apache.tomcat.embed/tomcat-embed-core","ranges":[">=8.0.0 <8.5.55"],"fixed":["8.5.55"]},{"ecosystem":"Maven","name":"org.apache.tomcat.embed:tomcat-embed-core","purl":"pkg:maven/org.apache.tomcat.embed/tomcat-embed-core","ranges":[">=7.0.0 <7.0.104"],"fixed":["7.0.104"]}]}],"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."]}