{"id":"CVE-2021-21307","url":"https://www.cyber-defence.io/tools/cve/CVE-2021-21307","generatedAt":"2026-11-05T01:44:10.180Z","title":"Lucee Server is a dynamic, Java based (JSR-223), tag and scripting language used for rapid web application development.","description":"Lucee Server is a dynamic, Java based (JSR-223), tag and scripting language used for rapid web application development. In Lucee Admin before versions 5.3.7.47, 5.3.6.68 or 5.3.5.96 there is an unauthenticated remote code exploit. This is fixed in versions 5.3.7.47, 5.3.6.68 or 5.3.5.96. As a workaround, one can block access to the Lucee Administrator.","published":"2021-02-11T19:15:13.000Z","lastModified":"2026-06-17T03:35:16.000Z","status":"Modified","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"3.1","score":9.8,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"cwe":["CWE-862"],"affected":["lucee/lucee server"],"epss":{"score":0.89189,"percentile":0.99781,"date":"2026-11-03","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"urgent","text":"EPSS puts the probability of exploitation in the next 30 days at 89.2%, higher than 100% of all known CVEs. Patch or mitigate before the next change window."},"changes":[],"references":[{"url":"http://ciacfug.org/blog/updating-lucee-as-part-of-a-vulnerability-alert-response","tags":["Patch","Third Party Advisory"],"source":"security-advisories@github.com"},{"url":"http://packetstormsecurity.com/files/163864/Lucee-Administrator-imgProcess.cfm-Arbitrary-File-Write.html","tags":["Exploit","Third Party Advisory","VDB Entry"],"source":"security-advisories@github.com"},{"url":"https://dev.lucee.org/t/lucee-vulnerability-alert-november-2020/7643","tags":["Vendor Advisory"],"source":"security-advisories@github.com"},{"url":"https://github.com/httpvoid/writeups/blob/main/Apple-RCE.md","tags":["Exploit","Third Party Advisory"],"source":"security-advisories@github.com"},{"url":"https://github.com/lucee/Lucee/commit/6208ab7c44c61d26c79e0b0af10382899f57e1ca","tags":["Patch","Third Party Advisory"],"source":"security-advisories@github.com"},{"url":"https://github.com/lucee/Lucee/security/advisories/GHSA-2xvv-723c-8p7r","tags":["Product"],"source":"security-advisories@github.com"},{"url":"https://portswigger.net/daily-swig/security-researchers-earn-50k-after-exposing-critical-flaw-in-apple-travel-portal","tags":["Press/Media Coverage","Third Party Advisory"],"source":"security-advisories@github.com"},{"url":"http://ciacfug.org/blog/updating-lucee-as-part-of-a-vulnerability-alert-response","tags":["Patch","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://packetstormsecurity.com/files/163864/Lucee-Administrator-imgProcess.cfm-Arbitrary-File-Write.html","tags":["Exploit","Third Party Advisory","VDB Entry"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://dev.lucee.org/t/lucee-vulnerability-alert-november-2020/7643","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/httpvoid/writeups/blob/main/Apple-RCE.md","tags":["Exploit","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/lucee/Lucee/commit/6208ab7c44c61d26c79e0b0af10382899f57e1ca","tags":["Patch","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/lucee/Lucee/security/advisories/GHSA-2xvv-723c-8p7r","tags":["Product"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://portswigger.net/daily-swig/security-researchers-earn-50k-after-exposing-critical-flaw-in-apple-travel-portal","tags":["Press/Media Coverage","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-21307","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}