{"id":"CVE-2021-20021","aliases":[],"url":"https://o3.security/vulnerability/CVE-2021-20021","summary":"A vulnerability in the SonicWall Email Security version 10.0.9.x allows an attacker to create an administrative account by sending a crafted HTTP request to the remote host.","details":"A vulnerability in the SonicWall Email Security version 10.0.9.x allows an attacker to create an administrative account by sending a crafted HTTP request to the remote host.","published":"2021-04-09T17:50:14.000Z","modified":"2026-08-12T03:55:25.008Z","cvss":{"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"},"epss":{"score":0.83425,"percentile":0.99659,"asOf":"2026-08-27"},"cisaKev":{"dateAdded":"2021-11-03","dueDate":"2021-11-17","knownRansomwareCampaignUse":true},"exploitsKnown":2,"affectedPackages":[],"fix":null,"references":[{"type":"WEB","url":"https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0007"},{"type":"WEB","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-20021"}],"provenance":{"sources":["OSV.dev","NVD","CISA KEV","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:55:25.008Z"}}