{"id":"CVE-2021-27799","url":"https://www.cyber-defence.io/tools/cve/CVE-2021-27799","generatedAt":"2026-10-27T22:32:07.237Z","title":"ean_leading_zeroes in backend/upcean.c in Zint Barcode Generator 2.9.1 has a stack-based buffer overflow that is reachable from the C API through an application that includes the Zint Barcode Generator library code.","description":"ean_leading_zeroes in backend/upcean.c in Zint Barcode Generator 2.9.1 has a stack-based buffer overflow that is reachable from the C API through an application that includes the Zint Barcode Generator library code.","published":"2021-02-26T22:15:21.000Z","lastModified":"2026-06-17T03:45:29.000Z","status":"Modified","sourceIdentifier":"cve@mitre.org","cvss":{"version":"3.1","score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"cwe":["CWE-787"],"affected":["zint/barcode generator"],"epss":{"score":0.02365,"percentile":0.83686,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (2.37%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"http://zint.org.uk/Manual.aspx?type=p&page=3","tags":["Vendor Advisory"],"source":"cve@mitre.org"},{"url":"http://zint.org.uk/Manual.aspx?type=p&page=4","tags":["Vendor Advisory"],"source":"cve@mitre.org"},{"url":"http://zint.org.uk/Manual.aspx?type=p&page=5","tags":["Vendor Advisory"],"source":"cve@mitre.org"},{"url":"https://sourceforge.net/p/zint/code/ci/7f8c8114f31c09a986597e0ba63a49f96150368a/","tags":["Patch","Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://sourceforge.net/p/zint/tickets/218/","tags":["Exploit","Third Party Advisory"],"source":"cve@mitre.org"},{"url":"http://zint.org.uk/Manual.aspx?type=p&page=3","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://zint.org.uk/Manual.aspx?type=p&page=4","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://zint.org.uk/Manual.aspx?type=p&page=5","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://sourceforge.net/p/zint/code/ci/7f8c8114f31c09a986597e0ba63a49f96150368a/","tags":["Patch","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://sourceforge.net/p/zint/tickets/218/","tags":["Exploit","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-27799","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."}