{"id":"CVE-2021-27821","title":"The Web Interface for OpenWRT LuCI version 19.07 and lower has been discovered to have a cross-site scripting vulnerability which can lead to attackers carrying out arbitrary code execution.","summary":"The Web Interface for OpenWRT LuCI version 19.07 and lower has been discovered to have a cross-site scripting vulnerability which can lead to attackers carrying out arbitrary code execution.","severity":"medium","cvss":6.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","cwe":["CWE-79"],"vendor":"openwrt","product":"luci","affected":["luci <= 19.07.0"],"published":"2021-05-25","updated":"2026-07-05","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2021-27821","references":[{"url":"http://openwrtorg.com","label":"cve@mitre.org"},{"url":"http://openwrt.com","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://openwrtorg.com","label":"af854a3a-2127-422b-91ae-364da2661108"}],"tags":["nvd"],"epss":0.00591,"epssPercentile":0.46,"ingestedAt":"2026-07-05T00:59:26.424Z","slug":"CVE-2021-27821","body":"## Overview\n\nThe Web Interface for OpenWRT LuCI version 19.07 and lower has been discovered to have a cross-site scripting vulnerability which can lead to attackers carrying out arbitrary code execution.\n\n## Affected\n\n- `luci <= 19.07.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":34,"depthScoreParts":{"impact":33.6,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}