{"cve":"CVE-2021-30640","nvd":{"published":"2021-07-12T15:15:08.367","modified":"2026-10-08T21:17:35.173","status":"Modified","description":"A vulnerability in the JNDI Realm of Apache Tomcat allows an attacker to authenticate using variations of a valid user name and/or to bypass some of the protection provided by the LockOut Realm. This issue affects Apache Tomcat 10.0.0-M1 to 10.0.5; 9.0.0.M1 to 9.0.45; 8.5.0 to 8.5.65.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N","score":6.5},"cwes":["CWE-116"],"references":["https://lists.apache.org/thread.html/r59f9ef03929d32120f91f4ea7e6e79edd5688d75d0a9b65fd26d1fe8%40%3Cannounce.tomcat.apache.org%3E","https://lists.debian.org/debian-lts-announce/2021/08/msg00009.html","https://security.gentoo.org/glsa/202208-34","https://security.netapp.com/advisory/ntap-20210827-0007/","https://www.debian.org/security/2021/dsa-4952"],"products":["apache:tomcat","debian:debian_linux","oracle:communications_cloud_native_core_policy","oracle:communications_diameter_signaling_router","oracle:communications_pricing_design_center","oracle:hospitality_cruise_shipboard_property_management_system","oracle:tekelec_platform_distribution"],"source":"nvd","synced_at":"2026-10-19T21:21:13.713336758+00:00"},"epss":{"cve":"CVE-2021-30640","score":0.09886,"percentile":0.95538,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-36qh-35cm-5w2w","url":"https://osv.dev/vulnerability/GHSA-36qh-35cm-5w2w","summary":"Authentication Bypass by Alternate Name in Apache Tomcat","modified":"2024-02-19T05:31:52.360019Z","packages":[{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat","purl":"pkg:maven/org.apache.tomcat/tomcat","ranges":[">=10.0.0-M1 <10.0.5"],"fixed":["10.0.5"]},{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat","purl":"pkg:maven/org.apache.tomcat/tomcat","ranges":[">=9.0.0M1 <9.0.45"],"fixed":["9.0.45"]},{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat","purl":"pkg:maven/org.apache.tomcat/tomcat","ranges":[">=8.5.0 <8.5.65"],"fixed":["8.5.65"]}]}],"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."]}