{"id":"CVE-2021-20021","aliases":["EUVD-2021-7484","GHSA-qwrf-wf47-mf5j"],"status":"published","title":"A vulnerability in the SonicWall Email Security version 10.0.9.x allows an attacker to create an...","description":"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.","severity":{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-12","score":0.8878,"percentile":0.99779,"model":"v2026.06.15"},"facts":{"in_kev":true,"known_exploited":true,"public_exploit":true,"fix_available":false},"cwes":["CWE-269","CWE-306"],"published":"2021-04-09T17:50:14Z","modified":"2026-08-12T05:17:33Z","kev":{"date_added":"2021-11-03","due_date":"2021-11-17","required_action":"Apply updates per vendor instructions.","known_ransomware_use":"Known"},"exploitation":[{"source":"euvd","since":"2021-11-03"},{"source":"kev","since":"2021-11-03"}],"exploits":[{"source":"pocgithub","id":"SUPRAAA-1337/CVE-2021-20021","title":"SUPRAAA-1337/CVE-2021-20021","date":"2023-09-07","url":"https://github.com/SUPRAAA-1337/CVE-2021-20021"},{"source":"nuclei","id":"CVE-2021-20021","title":"SonicWall Email Security \u003c= 10.0.9.x - Unauthenticated Admin Account Creation","type":"detection template","url":"https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-20021.yaml"}],"products":[{"vendor":"sonicwall","product":"email security"},{"vendor":"sonicwall","product":"email_security"},{"vendor":"sonicwall","product":"email_security_appliance_3300_firmware"},{"vendor":"sonicwall","product":"email_security_appliance_4300_firmware"},{"vendor":"sonicwall","product":"email_security_appliance_5000_firmware"},{"vendor":"sonicwall","product":"email_security_appliance_5050_firmware"},{"vendor":"sonicwall","product":"email_security_appliance_7000_firmware"},{"vendor":"sonicwall","product":"email_security_appliance_7050_firmware"},{"vendor":"sonicwall","product":"email_security_appliance_8300_firmware"},{"vendor":"sonicwall","product":"email_security_appliance_9000_firmware"},{"vendor":"sonicwall","product":"email_security_virtual_appliance"},{"vendor":"sonicwall","product":"hosted_email_security"},{"vendor":"sonicwall","product":"sonicwall email security"}],"references":[{"url":"https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0007","tags":["x_refsource_CONFIRM","x_transferred","Vendor Advisory"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-20021","tags":["government-resource","US Government Resource"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-20021"},{"url":"https://github.com/advisories/GHSA-qwrf-wf47-mf5j"}],"sources":{"cve":[{"id":"CVE-2021-20021","description":"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.","status":"published","published":"2021-04-09T17:50:14Z","modified":"2026-08-12T03:55:25.008Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"adp"}],"cwes":["CWE-269"],"updated_at":"2026-11-02T14:32:55.564736Z"}],"euvd":[{"id":"EUVD-2021-7484","description":"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.","status":"published","published":"2021-04-09T17:50:14Z","modified":"2026-08-12T03:55:25Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"exploited_since":"2021-11-03","updated_at":"2026-11-02T18:01:59.11112Z"}],"ghsa":[{"id":"GHSA-qwrf-wf47-mf5j","title":"A vulnerability in the SonicWall Email Security version 10.0.9.x allows an attacker to create an...","description":"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.","status":"published","published":"2022-05-24T17:46:57Z","modified":"2025-10-22T00:32:06Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-269"],"updated_at":"2026-11-02T15:04:04.786232Z"}],"kev":[{"id":"CVE-2021-20021","title":"SonicWall Email Security Improper Privilege Management Vulnerability","description":"SonicWall Email Security contains an improper privilege management vulnerability that allows an attacker to create an administrative account by sending a crafted HTTP request to the remote host. This vulnerability has known usage in a SonicWall Email Security exploit chain along with CVE-2021-20022 and CVE-2021-20023 to achieve privilege escalation.","cwes":["CWE-306"],"kev":{"date_added":"2021-11-03","due_date":"2021-11-17","required_action":"Apply updates per vendor instructions.","known_ransomware_use":"Known"},"updated_at":"2026-11-02T17:00:17.050017Z"}],"nvd":[{"id":"CVE-2021-20021","description":"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.","status":"published","published":"2021-04-09T18:15:13.38Z","modified":"2026-08-12T05:17:33.71Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary"},{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"secondary"},{"version":"2.0","score":7.5,"vector":"AV:N/AC:L/Au:N/C:P/I:P/A:P","level":"high","assessor":"primary"}],"cwes":["CWE-269"],"updated_at":"2026-11-02T14:06:51.610648Z"}]}}