{"schemaVersion":3,"id":"CVE-2021-21831","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"A use-after-free vulnerability exists in the JavaScript engine of Foxit Software’s PDF Reader, version 10.1.3.37598. A specially crafted PDF document can trigger the reuse of previously freed memory, which can lead to arbitrary code execution. An attacker needs to trick the user to open the malicious file to trigger this vulnerability. Exploitation is also possible if a user visits a specially crafted, malicious site if the browser plugin extension is enabled.","dates":{"published":"2021-08-05T20:07:30.000Z","modified":"2024-08-03T18:23:29.715Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":8.8,"severity":"high","version":"3.0","versionLabel":"v3.0","source":"CVE.org","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.0","versionLabel":"v3.0","source":"CVE.org","score":8.8,"severity":"high","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":8.8,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","exploitability":null,"impact":null,"computed":false},{"version":"3.0","versionLabel":"v3.0","source":"NVD","score":8.8,"severity":"high","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","exploitability":null,"impact":null,"computed":false},{"version":"2.0","versionLabel":"v2.0","source":"NVD","score":6.8,"severity":"medium","vector":"AV:N/AC:M/Au:N/C:P/I:P/A:P","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.06133,"percentile":0.93386,"severity":"low","asOf":"2026-10-20T00:00:00.000Z","change":{"pp":-0.02299999999999941,"baselineDate":"2026-09-20T00:00:00.000Z","baselineScore":0.06156},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.06156,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.06156,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.06156,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.06156,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.06156,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.06156,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.06156,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.06156,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.06156,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.06156,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.06156,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.06156,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.06156,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.06156,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.06156,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.06156,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.06133,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.06133,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.06133,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.06133,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.06133,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.06133,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.06133,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.06133,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.06133,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.06133,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.06133,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.06133,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.06133,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.06133,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.06133,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.06133,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.06133,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.06133,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.06133,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.06133,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.06133,"percentile":0.93386}],"last30":[{"date":"2026-09-20T00:00:00.000Z","score":0.06156,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.06156,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.06156,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.06156,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.06156,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.06156,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.06156,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.06156,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.06156,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.06156,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.06133,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.06133,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.06133,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.06133,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.06133,"percentile":null},{"d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At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory \"belongs\" to the code that operates on the new pointer.","type":"weakness","status":"Stable","abstraction":"Variant","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/416.html"}],"affected":[{"vendor":"foxit","product":"pdf_reader","name":"pdf reader","label":"pdf_reader","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"10.1.3.37598","noFixRecorded":false,"fixedIn":null}],"versionsText":"10.1.3.37598","eol":null,"hubHref":"/vendor/foxit/pdf_reader"}],"affectedCount":1,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://talosintelligence.com/vulnerability_reports/TALOS-2021-1294","label":"talosintelligence.com/vulnerability_reports/TALOS-2021-1294","hostname":"talosintelligence.com","tags":["X Refsource MISC","Exploit","Third Party Advisory"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2021-08-05T20:07:30.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2024-08-03T18:23:29.715Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":46,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-20T20:19:07.233Z","stale":false,"partial":false}}