{"id":"CVE-2006-3251","url":"https://www.cyber-defence.io/tools/cve/CVE-2006-3251","generatedAt":"2026-10-27T21:47:48.214Z","title":"Heap-based buffer overflow in the array_push function in hashcash.c for Hashcash before 1.21 might allow attackers to execute arbitrary code via crafted entries.","description":"Heap-based buffer overflow in the array_push function in hashcash.c for Hashcash before 1.21 might allow attackers to execute arbitrary code via crafted entries.","published":"2006-06-27T18:05:00.000Z","lastModified":"2026-06-16T22:26:42.000Z","status":"Modified","sourceIdentifier":"cve@mitre.org","cvss":{"version":"2.0","score":7.5,"severity":"HIGH","vector":"AV:N/AC:L/Au:N/C:P/I:P/A:P"},"cwe":["CWE-119"],"affected":["hashcash/hashcash"],"epss":{"score":0.03654,"percentile":0.89534,"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 (3.65%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"http://secunia.com/advisories/20800","tags":["Vendor Advisory"],"source":"cve@mitre.org"},{"url":"http://secunia.com/advisories/20846","tags":["Vendor Advisory"],"source":"cve@mitre.org"},{"url":"http://secunia.com/advisories/21146","tags":["Vendor Advisory"],"source":"cve@mitre.org"},{"url":"http://www.debian.org/security/2006/dsa-1114","source":"cve@mitre.org"},{"url":"http://www.gentoo.org/security/en/glsa/glsa-200606-25.xml","source":"cve@mitre.org"},{"url":"http://www.hashcash.org/source/CHANGELOG","source":"cve@mitre.org"},{"url":"http://www.securityfocus.com/bid/18659","tags":["Patch"],"source":"cve@mitre.org"},{"url":"http://www.vupen.com/english/advisories/2006/2551","tags":["Vendor Advisory"],"source":"cve@mitre.org"},{"url":"https://exchange.xforce.ibmcloud.com/vulnerabilities/27422","source":"cve@mitre.org"},{"url":"http://secunia.com/advisories/20800","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://secunia.com/advisories/20846","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://secunia.com/advisories/21146","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.debian.org/security/2006/dsa-1114","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.gentoo.org/security/en/glsa/glsa-200606-25.xml","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.hashcash.org/source/CHANGELOG","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.securityfocus.com/bid/18659","tags":["Patch"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.vupen.com/english/advisories/2006/2551","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://exchange.xforce.ibmcloud.com/vulnerabilities/27422","source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2006-3251","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."}