UBUNTU-CVE-2021-36367

Advisory lineage Upstream: 1 Downstream: 0
Upstream
CVE-2021-36367
Published: 09 Jul 2021, 21:15
Last modified:24 Oct 2025, 04:50

Vulnerability Summary

Overall Risk (default)
medium
32/100
CVSS Score
8.1 HIGH
3.1 (osv_ubuntu)
EPSS Score
No data
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

09 Jul 2021, 21:15
Published
Vulnerability first disclosed
24 Oct 2025, 04:50
Last Modified
Vulnerability information updated

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).

CVSS Metrics

  • v3.1•HIGH•Score: 8.1CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

Affected Systems

  • ubuntu•putty

    all | all | all | all

References (4)