{"id":"CVE-2021-39863","url":"https://www.cyber-defence.io/tools/cve/CVE-2021-39863","generatedAt":"2026-11-05T01:04:16.191Z","title":"Acrobat Reader DC versions 2021.005.20060 (and earlier), 2020.004.30006 (and earlier) and 2017.011.30199 (and earlier) are affected by a Buffer Overflow vulnerability when parsing a specially crafted PDF file.","description":"Acrobat Reader DC versions 2021.005.20060 (and earlier), 2020.004.30006 (and earlier) and 2017.011.30199 (and earlier) are affected by a Buffer Overflow vulnerability when parsing a specially crafted PDF file. 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":"2021-09-29T16:15:11.000Z","lastModified":"2026-06-17T04:04:19.000Z","status":"Modified","sourceIdentifier":"psirt@adobe.com","cvss":{"version":"3.1","score":7.8,"severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"},"cwe":["CWE-122"],"affected":["adobe/acrobat dc","adobe/acrobat reader dc","adobe/acrobat","adobe/acrobat reader","adobe/acrobat 2017","adobe/acrobat reader 2017"],"epss":{"score":0.13191,"percentile":0.96374,"date":"2026-11-03","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"urgent","text":"EPSS puts the probability of exploitation in the next 30 days at 13.2%, higher than 96% of all known CVEs. Patch or mitigate before the next change window."},"changes":[],"references":[{"url":"https://helpx.adobe.com/security/products/acrobat/apsb21-55.html","tags":["Release Notes","Vendor Advisory"],"source":"psirt@adobe.com"},{"url":"https://helpx.adobe.com/security/products/acrobat/apsb21-55.html","tags":["Release Notes","Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-39863","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}