{"schemaVersion":3,"id":"CVE-2020-21896","aliases":["UBUNTU-CVE-2020-21896","DEBIAN-CVE-2020-21896","DLA-4278-1"],"status":"published","duplicateOf":null,"title":null,"description":"A Use After Free vulnerability in svg_dev_text_span_as_paths_defs function in source/fitz/svg-device.c in Artifex Software MuPDF 1.16.0 allows remote attackers to cause a denial of service via opening of a crafted PDF file.","dates":{"published":"2023-08-22T00:00:00.000Z","modified":"2025-11-03T18:07:56.741Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":5.5,"severity":"medium","version":"3.1","versionLabel":"v3.1","source":"NVD","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"OSV · Ubuntu","score":5.5,"severity":"medium","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","exploitability":4.6,"impact":6,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Debian","score":5.5,"severity":"medium","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","exploitability":4.6,"impact":6,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":5.5,"severity":"medium","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00507,"percentile":0.4208,"severity":"low","asOf":"2026-10-20T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-20T00:00:00.000Z","baselineScore":0.00507},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.00507,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.00507,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.00507,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.00507,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.00507,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00507,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00507,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00507,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00507,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00507,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00507,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00507,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00507,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00507,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00507,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00507,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00507,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00507,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00507,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00507,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00507,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00507,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00507,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00507,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00507,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00507,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00507,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00507,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00507,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00507,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00507,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00507,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00507,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00507,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00507,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00507,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00507,"percentile":0.4208}],"last30":[{"date":"2026-09-20T00:00:00.000Z","score":0.00507,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00507,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00507,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00507,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00507,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00507,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00507,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00507,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00507,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00507,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00507,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00507,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00507,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00507,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00507,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00507,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00507,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00507,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00507,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00507,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00507,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00507,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00507,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00507,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00507,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00507,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00507,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00507,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00507,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00507,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00507,"percentile":0.4208}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[{"id":"REF_4B11AB94B2324C15","name":"Exploit Reference (bugs.ghostscript.com)","source":"reference","url":"https://bugs.ghostscript.com/show_bug.cgi?id=701294","maturity":"unknown","reliabilityScore":0.2,"verified":false,"type":null,"platforms":[],"requiresAuth":null,"exploitdb":null,"metasploit":null}],"exploitCount":1,"weaknesses":[{"id":"CWE-416","name":"Use After Free","description":"The product reuses or references memory after it has been freed. 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":"artifex","product":"mupdf","name":"MuPDF","label":"mupdf","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"1.16.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"1.16.0","eol":null,"hubHref":"/vendor/artifex/mupdf"},{"vendor":"debian","product":"mupdf","name":"mupdf","label":"mupdf","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/mupdf","purlType":"deb","versions":[{"text":"< 1.19.0+ds1-1","noFixRecorded":false,"fixedIn":null},{"text":"< 1.17.0+ds1-2+deb11u1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 1.19.0+ds1-1 | < 1.17.0+ds1-2+deb11u1","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"mupdf","name":"mupdf","label":"mupdf","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/mupdf","purlType":"deb","versions":[{"text":"< 1.12.0+ds1-1ubuntu0.1~esm1","noFixRecorded":false,"fixedIn":null},{"text":"< 1.16.1+ds1-1ubuntu1+esm1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 1.12.0+ds1-1ubuntu0.1~esm1 | < 1.16.1+ds1-1ubuntu1+esm1","eol":null,"hubHref":null}],"affectedCount":3,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://bugs.ghostscript.com/show_bug.cgi?id=701294","label":"bugs.ghostscript.com/show_bug.cgi?id=701294","hostname":"bugs.ghostscript.com","tags":["REPORT","Exploit","Issue Tracking","Patch","Vendor Advisory"]},{"url":"http://www.ghostscript.com/cgi-bin/findgit.cgi?8719e07834d6a72b6b4131539e49ed1e8e2ff79e","label":"www.ghostscript.com/cgi-bin/findgit.cgi?8719e07834d6a72b6b4131539e49ed1e8e2ff79e","hostname":"www.ghostscript.com","tags":["REPORT"]},{"url":"https://lists.debian.org/debian-lts-announce/2025/08/msg00017.html","label":"lists.debian.org/debian-lts-announce/2025/08/msg00017.html","hostname":"lists.debian.org","tags":[]},{"url":"https://ubuntu.com/security/CVE-2020-21896","label":"ubuntu.com/security/CVE-2020-21896","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2020-21896","label":"www.cve.org/CVERecord?id=CVE-2020-21896","hostname":"www.cve.org","tags":["REPORT"]},{"url":"https://ubuntu.com/security/notices/USN-7825-1","label":"ubuntu.com/security/notices/USN-7825-1","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2020-21896","label":"security-tracker.debian.org/tracker/CVE-2020-21896","hostname":"security-tracker.debian.org","tags":["Advisory"]}],"lineage":{"upstream":[],"downstream":["USN-7825-1"],"duplicates":[],"related":["USN-7825-1"]},"timeline":[{"kind":"published","date":"2023-08-22T00:00:00.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2025-11-03T18:07:56.741Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":32,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-20T18:46:48.920Z","stale":false,"partial":false}}