{"id":"CVE-2017-6542","url":"https://www.cyber-defence.io/tools/cve/CVE-2017-6542","generatedAt":"2026-10-29T01:45:44.930Z","title":"The ssh_agent_channel_data function in PuTTY before 0.68 allows remote attackers to have unspecified impact via a large length value in an agent protocol message and leveraging the ability to connect to the Unix-domain socket representing the forwarded…","description":"The ssh_agent_channel_data function in PuTTY before 0.68 allows remote attackers to have unspecified impact via a large length value in an agent protocol message and leveraging the ability to connect to the Unix-domain socket representing the forwarded agent connection, which trigger a buffer overflow.","published":"2017-03-27T17:59:01.000Z","lastModified":"2026-06-17T01:22:32.000Z","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":["putty/putty","opensuse/leap","opensuse project/leap"],"epss":{"score":0.21816,"percentile":0.97628,"date":"2026-10-27","history":[{"date":"2026-09-21","score":0.17431,"percentile":0.97048},{"date":"2026-09-22","score":0.21816,"percentile":0.97531}]},"kev":{"listed":false},"exploits":{"count":1,"verified":true,"firstPublished":"2017-06-07","source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[{"edbId":42137,"kind":"exploit","title":"PuTTY < 0.68 - 'ssh_agent_channel_data' Integer Overflow Heap Corruption","url":"https://www.exploit-db.com/exploits/42137","sourceUrl":"https://gitlab.com/exploit-database/exploitdb/-/blob/main/exploits/linux/dos/42137.txt","file":"exploits/linux/dos/42137.txt","published":"2017-06-07","added":"2017-06-07","updated":"2017-06-07","author":"Tim Kosse","type":"dos","platform":"linux","port":22,"verified":true,"codes":["CVE-2017-6542"],"tags":"Integer Overflow","aliases":null,"applicationUrl":"http://www.exploit-db.computty-0.67.tar.gz","screenshotUrl":null,"referenceUrl":"https://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-agent-fwd-overflow.html"}]},"verdict":{"level":"urgent","text":"EPSS puts the probability of exploitation in the next 30 days at 21.8%, higher than 98% of all known CVEs. Patch or mitigate before the next change window."},"changes":[],"references":[{"url":"http://lists.opensuse.org/opensuse-updates/2017-03/msg00055.html","tags":["Third Party Advisory"],"source":"cve@mitre.org"},{"url":"http://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-agent-fwd-overflow.html","tags":["Patch","Vendor Advisory"],"source":"cve@mitre.org"},{"url":"http://www.securityfocus.com/bid/97156","tags":["Third Party Advisory","VDB Entry"],"source":"cve@mitre.org"},{"url":"http://www.securitytracker.com/id/1038067","source":"cve@mitre.org"},{"url":"https://git.tartarus.org/?p=simon/putty.git%3Ba=commitdiff%3Bh=4ff22863d895cb7ebfced4cf923a012a614adaa8","source":"cve@mitre.org"},{"url":"https://security.gentoo.org/glsa/201703-03","tags":["Third Party Advisory","VDB Entry"],"source":"cve@mitre.org"},{"url":"https://security.gentoo.org/glsa/201706-09","source":"cve@mitre.org"},{"url":"https://www.exploit-db.com/exploits/42137/","source":"cve@mitre.org"},{"url":"http://lists.opensuse.org/opensuse-updates/2017-03/msg00055.html","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-agent-fwd-overflow.html","tags":["Patch","Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.securityfocus.com/bid/97156","tags":["Third Party Advisory","VDB Entry"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.securitytracker.com/id/1038067","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.tartarus.org/?p=simon/putty.git%3Ba=commitdiff%3Bh=4ff22863d895cb7ebfced4cf923a012a614adaa8","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.gentoo.org/glsa/201703-03","tags":["Third Party Advisory","VDB Entry"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.gentoo.org/glsa/201706-09","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.exploit-db.com/exploits/42137/","source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2017-6542","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."}