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).
History

Wed, 25 Feb 2026 18:15:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:a:putty:putty:-:*:*:*:*:*:*:*
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published: 2021-07-09T00:00:00.000Z

Updated: 2024-08-04T00:54:51.472Z

Reserved: 2021-07-09T00:00:00.000Z

Link: CVE-2021-36367

cve-icon Vulnrichment

Updated: 2024-08-04T00:54:51.472Z

cve-icon NVD

Status : Modified

Published: 2021-07-09T21:15:08.540

Modified: 2024-11-21T06:13:36.733

Link: CVE-2021-36367

cve-icon Redhat

No data.