{"schema":"threatline.record/2","record":{"id":"CVE-2023-38831","aliases":[],"summary":"RARLAB WinRAR Code Execution Vulnerability","details":"RARLAB WinRAR contains an unspecified vulnerability that allows an attacker to execute code when a user attempts to view a benign file within a ZIP archive.","categories":["Libraries & packages"],"product":"WinRAR","vendor":"RARLAB","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2023-38831","source_modified_at":"2026-08-05T03:55:55.112Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"n/a","vendor":"n/a","versions":[{"version":"n/a","status":"affected"}],"defaultStatus":null}],"fixed_versions":[],"cvss":7.8,"severity":"High","kev":{"listed":true,"date_added":"2023-08-24","due_date":"2023-09-14","required_action":"Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.","ransomware_campaign_use":"Known"},"epss":{"probability":0.99815,"percentile":0.99959,"score_date":"2026-10-23"},"published_at":"2023-08-23T00:00:00.000Z","modified_at":"2026-08-05T03:55:55.112Z","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-2023-38831","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-08-05T03:55:55.112Z"},{"source":"Metasploit","url":"https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/windows/fileformat/winrar_cve_2023_38831.rb","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2023-08-23"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2023-38831","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CISA KEV","CVE List","Metasploit","EPSS"],"references":[{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-38831","source":"CISA KEV"},{"source":"CVE List","url":"https://www.group-ib.com/blog/cve-2023-38831-winrar-zero-day/","tags":["x_transferred"]},{"source":"CVE List","url":"https://www.bleepingcomputer.com/news/security/winrar-zero-day-exploited-since-april-to-hack-trading-accounts/","tags":["x_transferred"]},{"source":"CVE List","url":"https://news.ycombinator.com/item?id=37236100","tags":["x_transferred"]},{"source":"CVE List","url":"https://blog.google/threat-analysis-group/government-backed-actors-exploiting-winrar-vulnerability/","tags":["x_transferred"]},{"source":"CVE List","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-38831","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":"2023-08-23T00:00:00+00:00"},"exploits":[{"source":"Metasploit","kind":"Exploit module","name":"WinRAR CVE-2023-38831 Exploit","url":"https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/windows/fileformat/winrar_cve_2023_38831.rb","date":"2023-08-23","added":"2026-05-21","check":false}],"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-08-05T03:55:55.112Z","content_hash":"fc107c400d393833687fc88f75de657fc4d4edb1cbaef492030a7a9c82a9ef9a"}}