CVE-2021-36367

PuTTY: Insufficient Verification of Data Authenticity

CVE-2021-36367 is fixed in PuTTY on 1 platform by PuTTY 0.76.0.0 (version 0.76.0.0), released July 17, 2021. It is not reported as exploited. Patch Radar priority: High.

High

CVSS

8.1

No vendor severity

Exploitation

None reported

No vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0111

66th percentile

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).

Where it's fixed

Product	Fixed in	Fix	Released
Windows apps
PuTTY	0.76.0.0	PuTTY 0.76.0.0	Jul 17, 2021

Details

Published
July 9, 2021
Weakness
CWE-345: Insufficient Verification of Data Authenticity
Vendor advisory
https://nvd.nist.gov/vuln/detail/CVE-2021-36367

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