CVE Feed

    Dashboard / CVE / CVE-2021-36367

    CVE-2021-36367

    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).

    Published:Jul 9, 2021
    Last Modified:Nov 21, 2024
    EPS:Jul 9, 2021
    EPSS Score:0.00135
    CVSS Score:8.1

    Affected Products

    Vendor
    Putty
    Product
    Putty

    Exploits

    No exploit reference

    Related CVEs

    CVE-2026-48852 (CVSS 3.7) — PuTTY 0.71 before 0.84 has an assertion failure in ECDSA signature verification.…
    CVE-2026-48851 (CVSS 3.1) — PuTTY 0.77 before 0.84 uses a copy of the PuTTY icon as a trust indication for TELNET data but the trust statu…
    CVE-2026-48850 (CVSS 3.7) — PuTTY 0.72 before 0.84 has a double free in RSA KEX.…
    CVE-2026-4115 (CVSS 2.9) — A vulnerability was detected in PuTTY 0.83. Affected is the function eddsa_verify of the file crypto/ecc-ssh.c…
    CVE-2024-31497 (CVSS 5.9) — In PuTTY 0.68 through 0.80 before 0.81, biased ECDSA nonce generation allows an attacker to recover a user's N…
    CVE-2023-48795 (CVSS 5.9) — The SSH transport protocol with certain OpenSSH extensions, found in OpenSSH before 9.6 and other products, al…
    CVE-2021-33500 (CVSS 7.5) — PuTTY before 0.75 on Windows allows remote servers to cause a denial of service (Windows GUI hang) by telling …
    CVE-2020-14002 (CVSS 5.9) — PuTTY 0.68 through 0.73 has an Observable Discrepancy leading to an information leak in the algorithm negotiat…
    CVE-2019-17067 (CVSS 9.8) — PuTTY before 0.73 on Windows improperly opens port-forwarding listening sockets, which allows attackers to lis…
    CVE-2019-17068 (CVSS 7.5) — PuTTY before 0.73 mishandles the "bracketed paste mode" protection mechanism, which may allow a session to be …

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High