{"id":"CVE-2016-2563","url":"https://www.cyber-defence.io/tools/cve/CVE-2016-2563","generatedAt":"2026-10-27T17:56:40.167Z","title":"Stack-based buffer overflow in the SCP command-line utility in PuTTY before 0.67 and KiTTY 0.66.6.3 and earlier allows remote servers to cause a denial of service (stack memory corruption) or execute arbitrary code via a crafted SCP-SINK file-size…","description":"Stack-based buffer overflow in the SCP command-line utility in PuTTY before 0.67 and KiTTY 0.66.6.3 and earlier allows remote servers to cause a denial of service (stack memory corruption) or execute arbitrary code via a crafted SCP-SINK file-size response to an SCP download request.","published":"2016-04-07T23:59:08.000Z","lastModified":"2026-06-17T00:44:18.000Z","status":"Modified","sourceIdentifier":"cve@mitre.org","cvss":{"version":"3.0","score":9.8,"severity":"CRITICAL","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"cwe":["CWE-119"],"affected":["9bis/kitty","simon tatham/putty"],"epss":{"score":0.32805,"percentile":0.98339,"date":"2026-10-26","history":[{"date":"2026-09-21","score":0.28528,"percentile":0.98093},{"date":"2026-09-22","score":0.34216,"percentile":0.98334},{"date":"2026-10-22","score":0.32805,"percentile":0.98353}]},"kev":{"listed":false},"exploits":{"count":1,"verified":false,"firstPublished":"2016-03-10","source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[{"edbId":39551,"kind":"exploit","title":"Putty pscp 0.66 - Stack Buffer Overwrite","url":"https://www.exploit-db.com/exploits/39551","sourceUrl":"https://gitlab.com/exploit-database/exploitdb/-/blob/main/exploits/multiple/dos/39551.txt","file":"exploits/multiple/dos/39551.txt","published":"2016-03-10","added":"2016-03-10","updated":"2018-01-11","author":"tintinweb","type":"dos","platform":"multiple","port":null,"verified":false,"codes":["CVE-2016-2563"],"tags":null,"aliases":null,"applicationUrl":null,"screenshotUrl":null,"referenceUrl":"https://github.com/tintinweb/pub/tree/999963dfda3f90f96687272d914967f2364a6651/pocs/cve-2016-2563"}]},"verdict":{"level":"urgent","text":"EPSS puts the probability of exploitation in the next 30 days at 32.8%, higher than 98% of all known CVEs. Patch or mitigate before the next change window."},"changes":[{"kind":"epss","label":"EPSS jump","at":"2026-09-22T00:00:00.000Z","detail":{"to":0.34216,"from":0.28528,"percentile":0.98334},"summary":"EPSS moved from 28.5% to 34.2% probability of exploitation in the next thirty days."}],"references":[{"url":"http://lists.opensuse.org/opensuse-updates/2016-05/msg00131.html","source":"cve@mitre.org"},{"url":"http://seclists.org/fulldisclosure/2016/Mar/22","source":"cve@mitre.org"},{"url":"http://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-pscp-sink-sscanf.html","tags":["Patch"],"source":"cve@mitre.org"},{"url":"http://www.securityfocus.com/bid/84296","source":"cve@mitre.org"},{"url":"http://www.securitytracker.com/id/1035257","source":"cve@mitre.org"},{"url":"https://github.com/tintinweb/pub/tree/master/pocs/cve-2016-2563","tags":["Vendor Advisory"],"source":"cve@mitre.org"},{"url":"https://security.gentoo.org/glsa/201606-01","source":"cve@mitre.org"},{"url":"http://lists.opensuse.org/opensuse-updates/2016-05/msg00131.html","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://seclists.org/fulldisclosure/2016/Mar/22","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-pscp-sink-sscanf.html","tags":["Patch"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.securityfocus.com/bid/84296","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.securitytracker.com/id/1035257","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/tintinweb/pub/tree/master/pocs/cve-2016-2563","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.gentoo.org/glsa/201606-01","source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2016-2563","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."}