CVE-2021-36367

2021-07-0900:00:00

mitre

github.com

putty

ssh

authentication

vulnerability

spoofed prompt

attacker-controlled server

AI Score

6.8

Confidence

Low

EPSS

0.002

Percentile

51.7%

SSVC

Exploitation

none

Automatable

Technical Impact

total

JSON

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).

ADP Affected

[
  {
    "cpes": [
      "cpe:2.3:a:putty:putty:-:*:*:*:*:*:*:*"
    ],
    "vendor": "putty",
    "product": "putty",
    "versions": [
      {
        "status": "affected",
        "version": "-",
        "versionType": "custom",
        "lessThanOrEqual": "0.75"
      }
    ],
    "defaultStatus": "unknown"
  }
]