{"cve":{"cve_id":"CVE-2021-44053","is_kev":false,"kev_date_added":null,"kev_vendor_project":null,"kev_product":null,"kev_vulnerability_name":null,"kev_short_description":null,"kev_required_action":null,"kev_due_date":null,"kev_known_ransomware":null,"kev_notes":null,"kev_cwes":null,"epss_score":0.00691,"epss_percentile":0.47986,"epss_as_of":"2026-06-23","description":"A cross-site scripting (XSS) vulnerability has been reported to affect QNAP device running QTS, QuTS hero and QuTScloud. If exploited, this vulnerability allows remote attackers to inject malicious code. We have already fixed this vulnerability in the following versions of QTS, QuTS hero and QuTScloud: QTS 4.5.4.1991 build 20220329 and later QTS 5.0.0.1986 build 20220324 and later QuTS hero h5.0.0.1986 build 20220324 and later QuTS hero h4.5.4.1971 build 20220310 and later QuTScloud c5.0.1.1949 and later","published_at":"2022-05-05T16:50:23.491000Z","last_modified_at":null,"cvss_v3_score":5.7,"cvss_v3_vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N","cvss_v3_severity":"MEDIUM","cvss_v4_score":null,"cvss_v4_vector":null,"cvss_v4_severity":null,"ssvc_decision":null,"ssvc_exploitation":null,"ssvc_automatable":null,"ssvc_technical_impact":null,"cwes":["CWE-79"],"nvd_references":["https://www.qnap.com/en/security-advisory/qsa-22-16"],"vuln_status":null,"trending_score":null,"is_trending":false,"has_trended":false,"trended_number_one":false,"trending_peak_score":null,"trending_peak_rank":null,"started_trending_at":null,"trended_number_one_at":null,"summary_generated":null,"summary_generated_at":null,"summary_model":null,"created_at":"2026-06-24T00:09:39.878444Z","updated_at":"2026-06-28T23:16:23.114133Z"},"effective_severity":"MEDIUM","badges":[],"impact_analysis":[],"cvss_v3_decoded":{"version":"3.1","metrics":[{"metric":"AV","name":"Attack Vector","value":"N","value_label":"Network"},{"metric":"AC","name":"Attack Complexity","value":"L","value_label":"Low"},{"metric":"PR","name":"Privileges Required","value":"L","value_label":"Low"},{"metric":"UI","name":"User Interaction","value":"R","value_label":"Required"},{"metric":"S","name":"Scope","value":"U","value_label":"Unchanged"},{"metric":"C","name":"Confidentiality","value":"H","value_label":"High"},{"metric":"I","name":"Integrity","value":"N","value_label":"None"},{"metric":"A","name":"Availability","value":"N","value_label":"None"}]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"qnap-systems-inc.","vendor_name":"QNAP Systems Inc.","product_slug":"qts","product_name":"QTS","version_start":"unspecified","version_start_inclusive":true,"version_end":"4.5.4.1991 build 20220329","version_end_inclusive":false,"cpe23_uri":"cve5:qnap-systems-inc.:qts:unspecified:4.5.4.1991 build 20220329"},{"vendor_slug":"qnap-systems-inc.","vendor_name":"QNAP Systems Inc.","product_slug":"qts","product_name":"QTS","version_start":"unspecified","version_start_inclusive":true,"version_end":"5.0.0.1986 build 20220324","version_end_inclusive":false,"cpe23_uri":"cve5:qnap-systems-inc.:qts:unspecified:5.0.0.1986 build 20220324"},{"vendor_slug":"qnap-systems-inc.","vendor_name":"QNAP Systems Inc.","product_slug":"qutscloud","product_name":"QuTScloud","version_start":"unspecified","version_start_inclusive":true,"version_end":"c5.0.1.1949","version_end_inclusive":false,"cpe23_uri":"cve5:qnap-systems-inc.:qutscloud:unspecified:c5.0.1.1949"},{"vendor_slug":"qnap-systems-inc.","vendor_name":"QNAP Systems Inc.","product_slug":"quts-hero","product_name":"QuTS hero","version_start":"unspecified","version_start_inclusive":true,"version_end":"h5.0.0.1986 build 20220324","version_end_inclusive":false,"cpe23_uri":"cve5:qnap-systems-inc.:quts-hero:unspecified:h5.0.0.1986 build 20220324"},{"vendor_slug":"qnap-systems-inc.","vendor_name":"QNAP Systems Inc.","product_slug":"quts-hero","product_name":"QuTS hero","version_start":"unspecified","version_start_inclusive":true,"version_end":"h4.5.4.1971 build 20220310","version_end_inclusive":false,"cpe23_uri":"cve5:qnap-systems-inc.:quts-hero:unspecified:h4.5.4.1971 build 20220310"}],"exploit_refs":[],"news":[],"references":[{"url":"https://www.qnap.com/en/security-advisory/qsa-22-16","source_type":"MISC","tags":[]}],"timeline":[{"type":"published","at":"2022-05-05T16:50:23.491000Z","label":"CVE published","source":null},{"type":"cvss_changed","at":"2026-06-28T17:19:49.878100Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:19:49.878100Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:19:49.878100Z","label":"CVSS score revised","source":"cvelistv5"}]}