{"attribution":"This product uses data from the NVD API but is not endorsed or certified by the NVD.","cve":{"id":"CVE-2021-36367","sourceIdentifier":"cve@mitre.org","published":"2021-07-09T21:15:08.540","lastModified":"2026-06-17T03:58:45.173","vulnStatus":"Modified","cveTags":[],"descriptions":[{"lang":"en","value":"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)."},{"lang":"es","value":"PuTTY versiones hasta 0.75, procede con establecer una sesión SSH incluso si nunca ha enviado una respuesta de autenticación sustantiva. Esto facilita a un servidor SSH controlado por un atacante presentar una petición de autenticación falsa posterior (que el atacante puede usar para capturar los datos de las credenciales, y usar esos datos para fines no deseados por el usuario cliente)"}],"affected":[{"source":"cve@mitre.org","affectedData":[{"vendor":"n/a","product":"n/a","versions":[{"version":"n/a","status":"affected"}]}]},{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","affectedData":[{"vendor":"putty","product":"putty","defaultStatus":"unknown","cpes":["cpe:2.3:a:putty:putty:-:*:*:*:*:*:*:*"],"versions":[{"version":"-","lessThanOrEqual":"0.75","versionType":"custom","status":"affected"}]}]}],"metrics":{"cvssMetricV31":[{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N","baseScore":8.1,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"NONE"},"exploitabilityScore":2.8,"impactScore":5.2},{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N","baseScore":8.1,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"NONE"},"exploitabilityScore":2.8,"impactScore":5.2}],"cvssMetricV2":[{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"2.0","vectorString":"AV:N/AC:M/Au:N/C:P/I:P/A:N","baseScore":5.8,"accessVector":"NETWORK","accessComplexity":"MEDIUM","authentication":"NONE","confidentialityImpact":"PARTIAL","integrityImpact":"PARTIAL","availabilityImpact":"NONE"},"baseSeverity":"MEDIUM","exploitabilityScore":8.6,"impactScore":4.9,"acInsufInfo":false,"obtainAllPrivilege":false,"obtainUserPrivilege":false,"obtainOtherPrivilege":false,"userInteractionRequired":true}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2024-02-22T20:07:50.029818Z","id":"CVE-2021-36367","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"weaknesses":[{"source":"nvd@nist.gov","type":"Primary","description":[{"lang":"en","value":"CWE-345"}]},{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","type":"Secondary","description":[{"lang":"en","value":"CWE-345"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:putty:putty:*:*:*:*:*:*:*:*","versionEndIncluding":"0.75","matchCriteriaId":"1159EB89-B30E-4381-8879-B40F5C935B62"}]}]}],"references":[{"url":"https://git.tartarus.org/?p=simon/putty.git%3Ba=commit%3Bh=1dc5659aa62848f0aeb5de7bd3839fecc7debefa","source":"cve@mitre.org"},{"url":"https://lists.debian.org/debian-lts-announce/2024/04/msg00016.html","source":"cve@mitre.org"},{"url":"https://www.chiark.greenend.org.uk/~sgtatham/putty/changes.html","source":"cve@mitre.org","tags":["Release Notes","Third Party Advisory"]},{"url":"https://www.debian.org/security/2023/dsa-5588","source":"cve@mitre.org"},{"url":"https://git.tartarus.org/?p=simon/putty.git%3Ba=commit%3Bh=1dc5659aa62848f0aeb5de7bd3839fecc7debefa","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.debian.org/debian-lts-announce/2024/04/msg00016.html","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.chiark.greenend.org.uk/~sgtatham/putty/changes.html","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Release Notes","Third Party Advisory"]},{"url":"https://www.debian.org/security/2023/dsa-5588","source":"af854a3a-2127-422b-91ae-364da2661108"}]}}