{"id":"ALPINE-CVE-2021-36367","details":"PuTTY through 0.75 proceeds with establishing an SSH session even if it has never sent a substantive authentication response. This makes it easier for an attacker-controlled SSH server to present a later spoofed authentication prompt (that the attacker can use to capture credential data, and use that data for purposes that are undesired by the client user).","modified":"2025-11-19T06:19:03.062577Z","published":"2021-07-09T21:15:08.540Z","upstream":["CVE-2021-36367"],"references":[{"type":"ADVISORY","url":"https://security.alpinelinux.org/vuln/CVE-2021-36367"}],"affected":[{"package":{"name":"putty","ecosystem":"Alpine:v3.11","purl":"pkg:apk/alpine/putty?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.76-r0"}]}],"versions":["0.60-r0","0.61-r0","0.62-r0","0.63-r0","0.64-r0","0.64-r1","0.65-r0","0.66-r0","0.67-r0","0.68-r0","0.69-r0","0.70-r0","0.70-r1","0.71-r0","0.71-r1","0.73-r0","0.73-r1","0.73-r2","0.74-r0"],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-36367.json"}},{"package":{"name":"putty","ecosystem":"Alpine:v3.12","purl":"pkg:apk/alpine/putty?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.76-r0"}]}],"versions":["0.60-r0","0.61-r0","0.62-r0","0.63-r0","0.64-r0","0.64-r1","0.65-r0","0.66-r0","0.67-r0","0.68-r0","0.69-r0","0.70-r0","0.70-r1","0.71-r0","0.71-r1","0.73-r0","0.73-r1","0.73-r2","0.74-r0"],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-36367.json"}},{"package":{"name":"putty","ecosystem":"Alpine:v3.13","purl":"pkg:apk/alpine/putty?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.76-r0"}]}],"versions":["0.60-r0","0.61-r0","0.62-r0","0.63-r0","0.64-r0","0.64-r1","0.65-r0","0.66-r0","0.67-r0","0.68-r0","0.69-r0","0.70-r0","0.70-r1","0.71-r0","0.71-r1","0.73-r0","0.73-r1","0.73-r2","0.74-r0"],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-36367.json"}},{"package":{"name":"putty","ecosystem":"Alpine:v3.14","purl":"pkg:apk/alpine/putty?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.76-r0"}]}],"versions":["0.60-r0","0.61-r0","0.62-r0","0.63-r0","0.64-r0","0.64-r1","0.65-r0","0.66-r0","0.67-r0","0.68-r0","0.69-r0","0.70-r0","0.70-r1","0.71-r0","0.71-r1","0.73-r0","0.73-r1","0.73-r2","0.74-r0","0.75-r0"],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-36367.json"}},{"package":{"name":"putty","ecosystem":"Alpine:v3.15","purl":"pkg:apk/alpine/putty?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.76-r0"}]}],"versions":["0.60-r0","0.61-r0","0.62-r0","0.63-r0","0.64-r0","0.64-r1","0.65-r0","0.66-r0","0.67-r0","0.68-r0","0.69-r0","0.70-r0","0.70-r1","0.71-r0","0.71-r1","0.73-r0","0.73-r1","0.73-r2","0.74-r0","0.75-r0"],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-36367.json"}},{"package":{"name":"putty","ecosystem":"Alpine:v3.16","purl":"pkg:apk/alpine/putty?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.76-r0"}]}],"versions":["0.60-r0","0.61-r0","0.62-r0","0.63-r0","0.64-r0","0.64-r1","0.65-r0","0.66-r0","0.67-r0","0.68-r0","0.69-r0","0.70-r0","0.70-r1","0.71-r0","0.71-r1","0.73-r0","0.73-r1","0.73-r2","0.74-r0","0.75-r0"],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-36367.json"}},{"package":{"name":"putty","ecosystem":"Alpine:v3.17","purl":"pkg:apk/alpine/putty?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.76-r0"}]}],"versions":["0.60-r0","0.61-r0","0.62-r0","0.63-r0","0.64-r0","0.64-r1","0.65-r0","0.66-r0","0.67-r0","0.68-r0","0.69-r0","0.70-r0","0.70-r1","0.71-r0","0.71-r1","0.73-r0","0.73-r1","0.73-r2","0.74-r0","0.75-r0"],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-36367.json"}},{"package":{"name":"putty","ecosystem":"Alpine:v3.18","purl":"pkg:apk/alpine/putty?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.76-r0"}]}],"versions":["0.60-r0","0.61-r0","0.62-r0","0.63-r0","0.64-r0","0.64-r1","0.65-r0","0.66-r0","0.67-r0","0.68-r0","0.69-r0","0.70-r0","0.70-r1","0.71-r0","0.71-r1","0.73-r0","0.73-r1","0.73-r2","0.74-r0","0.75-r0"],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-36367.json"}},{"package":{"name":"putty","ecosystem":"Alpine:v3.19","purl":"pkg:apk/alpine/putty?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.76-r0"}]}],"versions":["0.60-r0","0.61-r0","0.62-r0","0.63-r0","0.64-r0","0.64-r1","0.65-r0","0.66-r0","0.67-r0","0.68-r0","0.69-r0","0.70-r0","0.70-r1","0.71-r0","0.71-r1","0.73-r0","0.73-r1","0.73-r2","0.74-r0","0.75-r0"],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-36367.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N"}]}