{"schema":"threatline.record/2","record":{"id":"CVE-2021-20021","aliases":[],"summary":"SonicWall Email Security Improper Privilege Management Vulnerability","details":"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.","categories":["Network & edge"],"product":"SonicWall Email Security","vendor":"SonicWall","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2021-20021","source_modified_at":"2026-08-12T03:55:25.008Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"Email Security","vendor":"SonicWall","versions":[{"status":"affected","version":"10.0.9 and earlier"}],"defaultStatus":null}],"fixed_versions":[],"cvss":9.8,"severity":"Critical","kev":{"listed":true,"date_added":"2021-11-03","due_date":"2021-11-17","required_action":"Apply updates per vendor instructions.","ransomware_campaign_use":"Known"},"epss":{"probability":0.8878,"percentile":0.99779,"score_date":"2026-10-23"},"published_at":"2021-04-09T17:50:14.000Z","modified_at":"2026-08-12T03:55:25.008Z","provenance":[{"source":"CISA KEV","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23T17:00:09.9001Z"},{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2021-20021","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-08-12T03:55:25.008Z"},{"source":"Nuclei","url":"https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-20021.yaml","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":null},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2021-20021","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CISA KEV","CVE List","Nuclei","EPSS"],"references":[{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-20021","source":"CISA KEV"},{"source":"CVE List","url":"https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0007","tags":["x_refsource_CONFIRM","x_transferred"]},{"source":"CVE List","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-20021","tags":["government-resource"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CISA ADP","ssvc":{"exploitation":"active","automatable":"yes","technical_impact":"total","assessed_at":"2021-04-20T00:00:00+00:00"},"exploits":[{"source":"Nuclei","kind":"Scanner template","name":"SonicWall Email Security <= 10.0.9.x - Unauthenticated Admin Account Creation","url":"https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-20021.yaml"}],"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-08-12T03:55:25.008Z","content_hash":"daf5c675af36439a88b774d8b439718656dbeefaed5d90cf93ae821a55a04791"}}