CVE-2021-36367

HighCVSS 8.1/10Last modified Jun 17, 2026

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).

Metrics

CVSS 3.1 8.1/10CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

Weakness enumeration

CWE-345

Affected software

No affected versions have been published.

Timeline

Published: Jul 9, 2021
Last modified: Jun 17, 2026
NVD status: Modified

Related CVEs from 2021

CVE-2021-363683.7An issue was discovered in OpenSSH before 8.9. If a client is using public-key authentication with agent forwarding but without -oLogLevel=v CVE-2021-363697.5An issue was discovered in Dropbear through 2020.81. Due to a non-RFC-compliant check of the available authentication methods in the client-CVE-2021-36377.5A flaw was found in keycloak-model-infinispan in keycloak versions before 14.0.0 where authenticationSessions map in RootAuthenticationSessi CVE-2021-363707.5An issue was discovered in Midnight Commander through 4.8.26. When establishing an SFTP connection, the fingerprint of the server is neither CVE-2021-363713.7Emissary-Ingress (formerly Ambassador API Gateway) through 1.13.9 allows attackers to bypass client certificate requirements (i.e., mTLS cer CVE-2021-363729.8In Apache Ozone versions prior to 1.2.0, Initially generated block tokens are persisted to the metadata database and can be retrieved with a CVE-2021-363735.5When reading a specially crafted TAR archive an Apache Ant build can be made to allocate large amounts of memory that finally leads to an ou CVE-2021-363745.5When reading a specially crafted ZIP archive, or a derived formats, an Apache Ant build can be made to allocate large amounts of memory that CVE-2021-363767.8dandavison delta before 0.8.3 on Windows resolves an executable's pathname as a relative path from the current directory.CVE-2021-363777.5Fossil before 2.14.2 and 2.15.x before 2.15.2 often skips the hostname check during TLS certificate validation.CVE-2021-36386.5An out-of-bounds memory access flaw was found in the ATI VGA device emulation of QEMU. This flaw occurs in the ati_2d_blt() routine while ha CVE-2021-363809.8Sunhillo SureLine before 8.7.0.1.1 allows Unauthenticated OS Command Injection via shell metacharacters in ipAddr or dnsAddr /cgi/networkDia