{"id":"CVE-2021-20023","aliases":["EUVD-2021-7486","GHSA-86qp-448h-m269"],"status":"published","title":"SonicWall Email Security version 10.0.9.x contains a vulnerability that allows a post...","description":"SonicWall Email Security version 10.0.9.x contains a vulnerability that allows a post-authenticated attacker to read an arbitrary file on the remote host.","severity":{"version":"3.1","score":4.9,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-11","score":0.51689,"percentile":0.98962,"model":"v2026.06.15"},"facts":{"in_kev":true,"known_exploited":true,"public_exploit":false,"fix_available":false},"cwes":["CWE-22"],"published":"2021-04-20T11:55:13Z","modified":"2026-10-01T21:17:16Z","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"}],"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-2021-0010","tags":["x_refsource_CONFIRM","x_transferred","Vendor Advisory"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-20023","tags":["government-resource","US Government Resource"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-20023"},{"url":"https://github.com/advisories/GHSA-86qp-448h-m269"}],"sources":{"cve":[{"id":"CVE-2021-20023","description":"SonicWall Email Security version 10.0.9.x contains a vulnerability that allows a post-authenticated attacker to read an arbitrary file on the remote host.","status":"published","published":"2021-04-20T11:55:13Z","modified":"2026-10-01T20:20:16.365Z","cvss":[{"version":"3.1","score":4.9,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"adp"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T14:32:55.905855Z"}],"euvd":[{"id":"EUVD-2021-7486","description":"SonicWall Email Security version 10.0.9.x contains a vulnerability that allows a post-authenticated attacker to read an arbitrary file on the remote host.","status":"published","published":"2021-04-20T11:55:13Z","modified":"2026-10-01T20:20:16Z","cvss":[{"version":"3.1","score":4.9,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"exploited_since":"2021-11-03","updated_at":"2026-11-02T17:27:43.593551Z"}],"ghsa":[{"id":"GHSA-86qp-448h-m269","title":"SonicWall Email Security version 10.0.9.x contains a vulnerability that allows a post...","description":"SonicWall Email Security version 10.0.9.x contains a vulnerability that allows a post-authenticated attacker to read an arbitrary file on the remote host.","status":"published","published":"2022-05-24T17:47:54Z","modified":"2025-10-22T00:33:08Z","cvss":[{"version":"3.1","score":4.9,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T15:04:07.67458Z"}],"kev":[{"id":"CVE-2021-20023","title":"SonicWall Email Security Path Traversal Vulnerability","description":"SonicWall Email Security contains a path traversal vulnerability that allows a post-authenticated attacker to read files on the remote host. This vulnerability has known usage in a SonicWall Email Security exploit chain along with CVE-2021-20021 and CVE-2021-20022 to achieve privilege escalation.","cwes":["CWE-22"],"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-2021-20023","description":"SonicWall Email Security version 10.0.9.x contains a vulnerability that allows a post-authenticated attacker to read an arbitrary file on the remote host.","status":"published","published":"2021-04-20T12:15:12.587Z","modified":"2026-10-01T21:17:16.097Z","cvss":[{"version":"3.1","score":4.9,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"primary"},{"version":"3.1","score":4.9,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"secondary"},{"version":"2.0","score":4,"vector":"AV:N/AC:L/Au:S/C:P/I:N/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T14:06:52.03307Z"}]}}