VULNERABILITY INTELLIGENCE

CVE-2021-36367

CVSS score8.1 HIGH
EPSS probability1.11%
CISA KEVNot currently listed
Published2021-07-09
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

Description

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).

Weakness classification

  • CWE-345: Insufficient Verification of Data Authenticity

Primary references