{"schema":"threatline.record/2","record":{"id":"CVE-2020-9054","aliases":[],"summary":"Zyxel Multiple NAS Devices OS Command Injection Vulnerability","details":"Multiple Zyxel network-attached storage (NAS) devices contain a pre-authentication command injection vulnerability, which may allow a remote, unauthenticated attacker to execute arbitrary code.","categories":["Network & edge"],"product":"Multiple Network-Attached Storage (NAS) Devices","vendor":"Zyxel","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2020-9054","source_modified_at":"2026-10-07T17:32:05.389Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"NAS326","vendor":"ZyXEL","versions":[{"lessThanOrEqual":"V5.21(AAZF.7)C0","status":"affected","version":"V5.21(AAZF.7)C0","versionType":"custom"}],"defaultStatus":null},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2020-9054","source_modified_at":"2026-10-07T17:32:05.389Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"NAS520","vendor":"ZyXEL","versions":[{"lessThanOrEqual":"V5.21(AASZ.3)C0","status":"affected","version":"V5.21(AASZ.3)C0","versionType":"custom"}],"defaultStatus":null},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2020-9054","source_modified_at":"2026-10-07T17:32:05.389Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"NAS540","vendor":"ZyXEL","versions":[{"lessThanOrEqual":"V5.21(AATB.4)C0","status":"affected","version":"V5.21(AATB.4)C0","versionType":"custom"}],"defaultStatus":null},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2020-9054","source_modified_at":"2026-10-07T17:32:05.389Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"NAS542","vendor":"ZyXEL","versions":[{"lessThanOrEqual":"V5.21(ABAG.4)C0","status":"affected","version":"V5.21(ABAG.4)C0","versionType":"custom"}],"defaultStatus":null},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2020-9054","source_modified_at":"2026-10-07T17:32:05.389Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"NSA210","vendor":"ZyXEL","versions":[{"status":"affected","version":"all"}],"defaultStatus":null},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2020-9054","source_modified_at":"2026-10-07T17:32:05.389Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"NSA220","vendor":"ZyXEL","versions":[{"status":"affected","version":"all"}],"defaultStatus":null},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2020-9054","source_modified_at":"2026-10-07T17:32:05.389Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"NSA220+","vendor":"ZyXEL","versions":[{"status":"affected","version":"all"}],"defaultStatus":null},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2020-9054","source_modified_at":"2026-10-07T17:32:05.389Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"NSA221","vendor":"ZyXEL","versions":[{"status":"affected","version":"all"}],"defaultStatus":null},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2020-9054","source_modified_at":"2026-10-07T17:32:05.389Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"NSA310","vendor":"ZyXEL","versions":[{"lessThanOrEqual":"V4.75(AALH.2)C0","status":"affected","version":"V4.75(AALH.2)C0","versionType":"custom"}],"defaultStatus":null},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2020-9054","source_modified_at":"2026-10-07T17:32:05.389Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"NSA320","vendor":"ZyXEL","versions":[{"status":"affected","version":"all"}],"defaultStatus":null},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2020-9054","source_modified_at":"2026-10-07T17:32:05.389Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"NSA320S","vendor":"ZyXEL","versions":[{"lessThanOrEqual":"V4.75(AANV.2)C0","status":"affected","version":"V4.75(AANV.2)C0","versionType":"custom"}],"defaultStatus":null},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2020-9054","source_modified_at":"2026-10-07T17:32:05.389Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"NSA325","vendor":"ZyXEL","versions":[{"lessThanOrEqual":"V4.81(AAAJ.1)C0","status":"affected","version":"V4.81(AAAJ.1)C0","versionType":"custom"}],"defaultStatus":null},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2020-9054","source_modified_at":"2026-10-07T17:32:05.389Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"NSA325v2","vendor":"ZyXEL","versions":[{"lessThanOrEqual":"V4.81(AALS.1)C0","status":"affected","version":"V4.81(AALS.1)C0","versionType":"custom"}],"defaultStatus":null}],"fixed_versions":[],"cvss":9.8,"severity":"Critical","kev":{"listed":true,"date_added":"2022-03-25","due_date":"2022-04-15","required_action":"Apply updates per vendor instructions.","ransomware_campaign_use":"Unknown"},"epss":{"probability":0.99988,"percentile":0.99985,"score_date":"2026-10-23"},"published_at":"2020-03-04T19:30:18.400Z","modified_at":"2026-10-07T17:32:05.389Z","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-2020-9054","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-07T17:32:05.389Z"},{"source":"Nuclei","url":"https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2020/CVE-2020-9054.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-2020-9054","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-2020-9054","source":"CISA KEV"},{"source":"CVE List","url":"https://cwe.mitre.org/data/definitions/78.html","tags":["x_refsource_MISC","x_transferred"]},{"source":"CVE List","url":"https://www.zyxel.com/support/remote-code-execution-vulnerability-of-NAS-products.shtml","tags":["x_refsource_CONFIRM","x_transferred"]},{"source":"CVE List","url":"https://kb.cert.org/vuls/id/498544/","tags":["third-party-advisory","x_refsource_CERT-VN","x_transferred"]},{"source":"CVE List","url":"https://kb.cert.org/artifacts/cve-2020-9054.html","tags":["x_refsource_MISC","x_transferred"]},{"source":"CVE List","url":"https://krebsonsecurity.com/2020/02/zyxel-fixes-0day-in-network-storage-devices/","tags":["x_refsource_MISC","x_transferred"]},{"source":"CVE List","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-9054","tags":["government-resource"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CISA ADP","ssvc":{"exploitation":"active","automatable":"no","technical_impact":"total","assessed_at":"2025-02-07T13:09:21.970154Z"},"exploits":[{"source":"Nuclei","kind":"Scanner template","name":"Zyxel NAS Firmware 5.21- Remote Code Execution","url":"https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2020/CVE-2020-9054.yaml"}],"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-07T17:32:05.389Z","content_hash":"cb5a8b32eeb528340bf3488124381bcb56bf5c669e6548425230d31c7f6770a4"}}