{"cve":{"cve_id":"CVE-2021-21017","is_kev":true,"kev_date_added":"2021-11-03","kev_vendor_project":"Adobe","kev_product":"Acrobat and Reader","kev_vulnerability_name":"Adobe Acrobat and Reader Heap-based Buffer Overflow Vulnerability","kev_short_description":"Acrobat Acrobat and Reader contain a heap-based buffer overflow vulnerability that could allow an unauthenticated attacker to achieve code execution in the context of the current user.","kev_required_action":"Apply updates per vendor instructions.","kev_due_date":"2021-11-17","kev_known_ransomware":false,"kev_notes":"https://nvd.nist.gov/vuln/detail/CVE-2021-21017","kev_cwes":["CWE-122"],"epss_score":0.8621,"epss_percentile":0.99705,"epss_as_of":"2026-06-23","description":"Acrobat Reader DC versions versions 2020.013.20074 (and earlier), 2020.001.30018 (and earlier) and 2017.011.30188 (and earlier) are affected by a heap-based buffer overflow vulnerability. An unauthenticated attacker could leverage this vulnerability to achieve arbitrary code execution in the context of the current user. Exploitation of this issue requires user interaction in that a victim must open a malicious file.","published_at":"2021-02-11T19:42:20.225000Z","last_modified_at":null,"cvss_v3_score":8.8,"cvss_v3_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","cvss_v3_severity":"HIGH","cvss_v4_score":null,"cvss_v4_vector":null,"cvss_v4_severity":null,"ssvc_decision":null,"ssvc_exploitation":"active","ssvc_automatable":false,"ssvc_technical_impact":"total","cwes":["CWE-122"],"nvd_references":["https://helpx.adobe.com/security/products/acrobat/apsb21-09.html"],"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":"2026-06-24T00:09:31.350578Z","updated_at":"2026-06-28T23:14:55.844827Z"},"effective_severity":"HIGH","badges":["kev","epss"],"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":"N","value_label":"None"},{"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":"H","value_label":"High"},{"metric":"A","name":"Availability","value":"H","value_label":"High"}]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"adobe","vendor_name":"Adobe","product_slug":"acrobat-reader","product_name":"Acrobat Reader","version_start":"unspecified","version_start_inclusive":true,"version_end":"2020.013.20074","version_end_inclusive":true,"cpe23_uri":"cve5:adobe:acrobat-reader:unspecified:2020.013.20074"},{"vendor_slug":"adobe","vendor_name":"Adobe","product_slug":"acrobat-reader","product_name":"Acrobat Reader","version_start":"unspecified","version_start_inclusive":true,"version_end":"2020.001.30018","version_end_inclusive":true,"cpe23_uri":"cve5:adobe:acrobat-reader:unspecified:2020.001.30018"},{"vendor_slug":"adobe","vendor_name":"Adobe","product_slug":"acrobat-reader","product_name":"Acrobat Reader","version_start":"unspecified","version_start_inclusive":true,"version_end":"2017.011.30188","version_end_inclusive":true,"cpe23_uri":"cve5:adobe:acrobat-reader:unspecified:2017.011.30188"},{"vendor_slug":"adobe","vendor_name":"Adobe","product_slug":"acrobat-reader","product_name":"Acrobat Reader","version_start":"unspecified","version_start_inclusive":true,"version_end":"None","version_end_inclusive":true,"cpe23_uri":"cve5:adobe:acrobat-reader:unspecified:None"}],"exploit_refs":[],"news":[],"references":[{"url":"https://helpx.adobe.com/security/products/acrobat/apsb21-09.html","source_type":"VENDOR_ADVISORY","tags":["advisory"]}],"timeline":[{"type":"published","at":"2021-02-11T19:42:20.225000Z","label":"CVE published","source":null},{"type":"cisa_reported","at":"2021-11-03T00:00:00Z","label":"Added to CISA KEV catalog","source":"kev"},{"type":"ssvc_changed","at":"2026-06-24T00:31:36.955378Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"ssvc_changed","at":"2026-06-24T00:31:36.955378Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"ssvc_changed","at":"2026-06-24T00:31:36.955378Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"cvss_changed","at":"2026-06-24T00:31:36.955378Z","label":"CVSS score revised","source":"vulnrichment"},{"type":"cvss_changed","at":"2026-06-24T00:31:36.955378Z","label":"CVSS score revised","source":"vulnrichment"},{"type":"cvss_changed","at":"2026-06-24T00:31:36.955378Z","label":"CVSS score revised","source":"vulnrichment"}]}